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* [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock()
@ 2020-02-07 10:10 Kai-Heng Feng
  2020-02-07 10:10 ` [PATCH v3 2/2] net-sysfs: Ensure begin/complete are called in speed_show() and duplex_show() Kai-Heng Feng
  2020-02-22  0:30 ` [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock() Brown, Aaron F
  0 siblings, 2 replies; 8+ messages in thread
From: Kai-Heng Feng @ 2020-02-07 10:10 UTC (permalink / raw)
  To: davem, mkubecek, jeffrey.t.kirsher
  Cc: Kai-Heng Feng, moderated list:INTEL ETHERNET DRIVERS,
	open list:NETWORKING DRIVERS, open list

Commit 9474933caf21 ("igb: close/suspend race in netif_device_detach")
fixed race condition between close and power management ops by using
rtnl_lock().

However we can achieve the same by using device_lock() since all power
management ops are protected by device_lock().

This fix is a preparation for next patch, to prevent a dead lock under
rtnl_lock() when calling runtime resume routine.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v3:
 - Fix unreleased lock reported by 0-day test bot.
v2:
 - No change.

 drivers/net/ethernet/intel/igb/igb_main.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index b46bff8fe056..661255500d66 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4026,9 +4026,15 @@ static int __igb_close(struct net_device *netdev, bool suspending)
 
 int igb_close(struct net_device *netdev)
 {
+	struct igb_adapter *adapter = netdev_priv(netdev);
+	struct device *dev = &adapter->pdev->dev;
+	int err = 0;
+
+	device_lock(dev);
 	if (netif_device_present(netdev) || netdev->dismantle)
-		return __igb_close(netdev, false);
-	return 0;
+		err = __igb_close(netdev, false);
+	device_unlock(dev);
+	return err;
 }
 
 /**
@@ -8760,7 +8766,6 @@ static int __igb_shutdown(struct pci_dev *pdev, bool *enable_wake,
 	u32 wufc = runtime ? E1000_WUFC_LNKC : adapter->wol;
 	bool wake;
 
-	rtnl_lock();
 	netif_device_detach(netdev);
 
 	if (netif_running(netdev))
@@ -8769,7 +8774,6 @@ static int __igb_shutdown(struct pci_dev *pdev, bool *enable_wake,
 	igb_ptp_suspend(adapter);
 
 	igb_clear_interrupt_scheme(adapter);
-	rtnl_unlock();
 
 	status = rd32(E1000_STATUS);
 	if (status & E1000_STATUS_LU)
@@ -8897,13 +8901,11 @@ static int __maybe_unused igb_resume(struct device *dev)
 
 	wr32(E1000_WUS, ~0);
 
-	rtnl_lock();
 	if (!err && netif_running(netdev))
 		err = __igb_open(netdev, true);
 
 	if (!err)
 		netif_device_attach(netdev);
-	rtnl_unlock();
 
 	return err;
 }
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v3 2/2] net-sysfs: Ensure begin/complete are called in speed_show() and duplex_show()
  2020-02-07 10:10 [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock() Kai-Heng Feng
@ 2020-02-07 10:10 ` Kai-Heng Feng
  2020-02-20  5:45   ` Kai-Heng Feng
  2020-02-22  0:30 ` [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock() Brown, Aaron F
  1 sibling, 1 reply; 8+ messages in thread
From: Kai-Heng Feng @ 2020-02-07 10:10 UTC (permalink / raw)
  To: davem, mkubecek, jeffrey.t.kirsher
  Cc: Kai-Heng Feng, Jakub Kicinski, Maxime Chevallier,
	Heiner Kallweit, Andy Shevchenko, Jouni Hogander, Eric Dumazet,
	Greg Kroah-Hartman, Wang Hai, YueHaibing, Kimberly Brown,
	Thomas Gleixner, Florian Fainelli, Jiri Pirko, Andrew Lunn,
	Li RongQing, open list, open list:NETWORKING [GENERAL]

Device like igb gets runtime suspended when there's no link partner. We
can't get correct speed under that state:
$ cat /sys/class/net/enp3s0/speed
1000

In addition to that, an error can also be spotted in dmesg:
[  385.991957] igb 0000:03:00.0 enp3s0: PCIe link lost

It's because the igb device doesn't get runtime resumed before calling
get_link_ksettings().

So let's use a new helper to call begin() and complete() like what
dev_ethtool() does, to runtime resume/suspend or power up/down the
device properly.

Once this fix is in place, igb can show the speed correctly without link
partner:
$ cat /sys/class/net/enp3s0/speed
-1

-1 here means SPEED_UNKNOWN, which is the correct value when igb is
runtime suspended.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v3:
 - Specify -1 means SPEED_UNKNOWN.
v2:
 - Add a new helper with begin/complete and use it in net-sysfs.

 include/linux/ethtool.h |  4 ++++
 net/core/net-sysfs.c    |  4 ++--
 net/ethtool/ioctl.c     | 33 ++++++++++++++++++++++++++++++++-
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 95991e4300bf..785ec1921417 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -160,6 +160,10 @@ extern int
 __ethtool_get_link_ksettings(struct net_device *dev,
 			     struct ethtool_link_ksettings *link_ksettings);
 
+extern int
+__ethtool_get_link_ksettings_full(struct net_device *dev,
+				  struct ethtool_link_ksettings *link_ksettings);
+
 /**
  * ethtool_intersect_link_masks - Given two link masks, AND them together
  * @dst: first mask and where result is stored
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 4c826b8bf9b1..a199e15a080f 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -201,7 +201,7 @@ static ssize_t speed_show(struct device *dev,
 	if (netif_running(netdev)) {
 		struct ethtool_link_ksettings cmd;
 
-		if (!__ethtool_get_link_ksettings(netdev, &cmd))
+		if (!__ethtool_get_link_ksettings_full(netdev, &cmd))
 			ret = sprintf(buf, fmt_dec, cmd.base.speed);
 	}
 	rtnl_unlock();
@@ -221,7 +221,7 @@ static ssize_t duplex_show(struct device *dev,
 	if (netif_running(netdev)) {
 		struct ethtool_link_ksettings cmd;
 
-		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
+		if (!__ethtool_get_link_ksettings_full(netdev, &cmd)) {
 			const char *duplex;
 
 			switch (cmd.base.duplex) {
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index b987052d91ef..faeba247c1fb 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -420,7 +420,9 @@ struct ethtool_link_usettings {
 	} link_modes;
 };
 
-/* Internal kernel helper to query a device ethtool_link_settings. */
+/* Internal kernel helper to query a device ethtool_link_settings. To be called
+ * inside begin/complete block.
+ */
 int __ethtool_get_link_ksettings(struct net_device *dev,
 				 struct ethtool_link_ksettings *link_ksettings)
 {
@@ -434,6 +436,35 @@ int __ethtool_get_link_ksettings(struct net_device *dev,
 }
 EXPORT_SYMBOL(__ethtool_get_link_ksettings);
 
+/* Internal kernel helper to query a device ethtool_link_settings. To be called
+ * outside of begin/complete block.
+ */
+int __ethtool_get_link_ksettings_full(struct net_device *dev,
+				      struct ethtool_link_ksettings *link_ksettings)
+{
+	int rc;
+
+	ASSERT_RTNL();
+
+	if (!dev->ethtool_ops->get_link_ksettings)
+		return -EOPNOTSUPP;
+
+	if (dev->ethtool_ops->begin) {
+		rc = dev->ethtool_ops->begin(dev);
+		if (rc  < 0)
+			return rc;
+	}
+
+	memset(link_ksettings, 0, sizeof(*link_ksettings));
+	rc = dev->ethtool_ops->get_link_ksettings(dev, link_ksettings);
+
+	if (dev->ethtool_ops->complete)
+		dev->ethtool_ops->complete(dev);
+
+	return rc;
+}
+EXPORT_SYMBOL(__ethtool_get_link_ksettings_full);
+
 /* convert ethtool_link_usettings in user space to a kernel internal
  * ethtool_link_ksettings. return 0 on success, errno on error.
  */
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 8+ messages in thread
* Re: [PATCH v3 2/2] net-sysfs: Ensure begin/complete are called in speed_show() and duplex_show()
  2020-02-07 10:10 ` [PATCH v3 2/2] net-sysfs: Ensure begin/complete are called in speed_show() and duplex_show() Kai-Heng Feng
@ 2020-02-20  5:45   ` Kai-Heng Feng
  2020-03-11  3:30     ` Kai-Heng Feng
  0 siblings, 1 reply; 8+ messages in thread
From: Kai-Heng Feng @ 2020-02-20  5:45 UTC (permalink / raw)
  To: David Miller, Michal Kubecek, Jeff Kirsher
  Cc: Jakub Kicinski, Maxime Chevallier, Heiner Kallweit,
	Andy Shevchenko, Jouni Hogander, Eric Dumazet,
	Greg Kroah-Hartman, Wang Hai, YueHaibing, Kimberly Brown,
	Thomas Gleixner, Florian Fainelli, Jiri Pirko, Andrew Lunn,
	Li RongQing, open list, open list:NETWORKING [GENERAL]


> On Feb 7, 2020, at 18:10, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
> 
> Device like igb gets runtime suspended when there's no link partner. We
> can't get correct speed under that state:
> $ cat /sys/class/net/enp3s0/speed
> 1000
> 
> In addition to that, an error can also be spotted in dmesg:
> [  385.991957] igb 0000:03:00.0 enp3s0: PCIe link lost
> 
> It's because the igb device doesn't get runtime resumed before calling
> get_link_ksettings().
> 
> So let's use a new helper to call begin() and complete() like what
> dev_ethtool() does, to runtime resume/suspend or power up/down the
> device properly.
> 
> Once this fix is in place, igb can show the speed correctly without link
> partner:
> $ cat /sys/class/net/enp3s0/speed
> -1
> 
> -1 here means SPEED_UNKNOWN, which is the correct value when igb is
> runtime suspended.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

A gentle ping...

Kai-Heng

> ---
> v3:
> - Specify -1 means SPEED_UNKNOWN.
> v2:
> - Add a new helper with begin/complete and use it in net-sysfs.
> 
> include/linux/ethtool.h |  4 ++++
> net/core/net-sysfs.c    |  4 ++--
> net/ethtool/ioctl.c     | 33 ++++++++++++++++++++++++++++++++-
> 3 files changed, 38 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
> index 95991e4300bf..785ec1921417 100644
> --- a/include/linux/ethtool.h
> +++ b/include/linux/ethtool.h
> @@ -160,6 +160,10 @@ extern int
> __ethtool_get_link_ksettings(struct net_device *dev,
> 			     struct ethtool_link_ksettings *link_ksettings);
> 
> +extern int
> +__ethtool_get_link_ksettings_full(struct net_device *dev,
> +				  struct ethtool_link_ksettings *link_ksettings);
> +
> /**
>  * ethtool_intersect_link_masks - Given two link masks, AND them together
>  * @dst: first mask and where result is stored
> diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
> index 4c826b8bf9b1..a199e15a080f 100644
> --- a/net/core/net-sysfs.c
> +++ b/net/core/net-sysfs.c
> @@ -201,7 +201,7 @@ static ssize_t speed_show(struct device *dev,
> 	if (netif_running(netdev)) {
> 		struct ethtool_link_ksettings cmd;
> 
> -		if (!__ethtool_get_link_ksettings(netdev, &cmd))
> +		if (!__ethtool_get_link_ksettings_full(netdev, &cmd))
> 			ret = sprintf(buf, fmt_dec, cmd.base.speed);
> 	}
> 	rtnl_unlock();
> @@ -221,7 +221,7 @@ static ssize_t duplex_show(struct device *dev,
> 	if (netif_running(netdev)) {
> 		struct ethtool_link_ksettings cmd;
> 
> -		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
> +		if (!__ethtool_get_link_ksettings_full(netdev, &cmd)) {
> 			const char *duplex;
> 
> 			switch (cmd.base.duplex) {
> diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
> index b987052d91ef..faeba247c1fb 100644
> --- a/net/ethtool/ioctl.c
> +++ b/net/ethtool/ioctl.c
> @@ -420,7 +420,9 @@ struct ethtool_link_usettings {
> 	} link_modes;
> };
> 
> -/* Internal kernel helper to query a device ethtool_link_settings. */
> +/* Internal kernel helper to query a device ethtool_link_settings. To be called
> + * inside begin/complete block.
> + */
> int __ethtool_get_link_ksettings(struct net_device *dev,
> 				 struct ethtool_link_ksettings *link_ksettings)
> {
> @@ -434,6 +436,35 @@ int __ethtool_get_link_ksettings(struct net_device *dev,
> }
> EXPORT_SYMBOL(__ethtool_get_link_ksettings);
> 
> +/* Internal kernel helper to query a device ethtool_link_settings. To be called
> + * outside of begin/complete block.
> + */
> +int __ethtool_get_link_ksettings_full(struct net_device *dev,
> +				      struct ethtool_link_ksettings *link_ksettings)
> +{
> +	int rc;
> +
> +	ASSERT_RTNL();
> +
> +	if (!dev->ethtool_ops->get_link_ksettings)
> +		return -EOPNOTSUPP;
> +
> +	if (dev->ethtool_ops->begin) {
> +		rc = dev->ethtool_ops->begin(dev);
> +		if (rc  < 0)
> +			return rc;
> +	}
> +
> +	memset(link_ksettings, 0, sizeof(*link_ksettings));
> +	rc = dev->ethtool_ops->get_link_ksettings(dev, link_ksettings);
> +
> +	if (dev->ethtool_ops->complete)
> +		dev->ethtool_ops->complete(dev);
> +
> +	return rc;
> +}
> +EXPORT_SYMBOL(__ethtool_get_link_ksettings_full);
> +
> /* convert ethtool_link_usettings in user space to a kernel internal
>  * ethtool_link_ksettings. return 0 on success, errno on error.
>  */
> -- 
> 2.17.1
> 


^ permalink raw reply	[flat|nested] 8+ messages in thread
* RE: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock()
  2020-02-07 10:10 [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock() Kai-Heng Feng
  2020-02-07 10:10 ` [PATCH v3 2/2] net-sysfs: Ensure begin/complete are called in speed_show() and duplex_show() Kai-Heng Feng
@ 2020-02-22  0:30 ` Brown, Aaron F
  2020-02-24 11:01   ` Kai-Heng Feng
  1 sibling, 1 reply; 8+ messages in thread
From: Brown, Aaron F @ 2020-02-22  0:30 UTC (permalink / raw)
  To: Kai-Heng Feng, davem, mkubecek, Kirsher, Jeffrey T
  Cc: open list:NETWORKING DRIVERS,
	moderated list:INTEL ETHERNET DRIVERS, open list



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Kai-Heng Feng
> Sent: Friday, February 7, 2020 2:10 AM
> To: davem@davemloft.net; mkubecek@suse.cz; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@intel.com>
> Cc: open list:NETWORKING DRIVERS <netdev@vger.kernel.org>; Kai-Heng
> Feng <kai.heng.feng@canonical.com>; moderated list:INTEL ETHERNET
> DRIVERS <intel-wired-lan@lists.osuosl.org>; open list <linux-
> kernel@vger.kernel.org>
> Subject: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of
> rtnl_lock()
> 
> Commit 9474933caf21 ("igb: close/suspend race in netif_device_detach")
> fixed race condition between close and power management ops by using
> rtnl_lock().
> 
> However we can achieve the same by using device_lock() since all power
> management ops are protected by device_lock().
> 
> This fix is a preparation for next patch, to prevent a dead lock under
> rtnl_lock() when calling runtime resume routine.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> v3:
>  - Fix unreleased lock reported by 0-day test bot.
> v2:
>  - No change.
> 
>  drivers/net/ethernet/intel/igb/igb_main.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)

This patch introduces the following call trace / RIP when I sleep / resume (via rtcwake) a system that has an igb port with link up:  I'm not sure if it introduces the issue or just exposes / displays it as it only shows up on the first sleep / resume cycle and the systems I have that were stable for many sleep / resume cycles (arbitrarily 50+) continue to be so.  
-------------------------------------------------------------------------------------------------
...
[   50.279436] usb usb3: root hub lost power or was reset
[   50.279437] usb usb4: root hub lost power or was reset
[   50.279491] sd 1:0:0:0: [sda] Starting disk
[   50.317691] ------------[ cut here ]------------
[   50.317692] RTNL: assertion failed at net/core/dev.c (2867)
[   50.317700] WARNING: CPU: 6 PID: 5287 at net/core/dev.c:2867 netif_set_real_num_tx_queues+0x184/0x1a0
[   50.317701] Modules linked in: rfcomm xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ipt_REJECT nf_rej
ect_ipv4 nft_counter nft_compat nf_tables nfnetlink tun bridge stp llc cmac bnep iTCO_wdt intel_wmi_thunderbolt iT
CO_vendor_support mxm_wmi wmi_bmof x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm
 snd_hda_codec_realtek irqbypass snd_hda_codec_generic ledtrig_audio btusb btrtl btbcm snd_hda_intel btintel snd_i
ntel_dspcfg snd_hda_codec bluetooth snd_hwdep snd_hda_core snd_seq crct10dif_pclmul crc32_pclmul joydev snd_seq_de
vice ghash_clmulni_intel intel_cstate snd_pcm mei_me intel_uncore snd_timer ecdh_generic snd ecc pcspkr mei rfkill
 i2c_i801 soundcore intel_rapl_perf sg wmi acpi_pad intel_pmc_core nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_
tables xfs libcrc32c sr_mod sd_mod cdrom t10_pi i915 intel_gtt drm_kms_helper syscopyarea sysfillrect sysimgblt fb
_sys_fops cec drm igb ahci libahci e1000e libata crc32c_intel dca i2c_algo_bit video
[   50.317719] CPU: 6 PID: 5287 Comm: kworker/u24:17 Not tainted 5.6.0-rc2_next-queue_dev-queue_81b6341+ #5
[   50.317720] Hardware name: Gigabyte Technology Co., Ltd. Z370 AORUS Gaming 5/Z370 AORUS Gaming 5-CF, BIOS F6 04
/03/2018
[   50.317722] Workqueue: events_unbound async_run_entry_fn
[   50.317723] RIP: 0010:netif_set_real_num_tx_queues+0x184/0x1a0
[   50.317724] Code: 43 1e e7 00 00 0f 85 fc fe ff ff ba 33 0b 00 00 48 c7 c6 92 57 9a bd 48 c7 c7 e0 a4 91 bd c6
05 23 1e e7 00 01 e8 57 3c 97 ff <0f> 0b e9 d6 fe ff ff 41 be ea ff ff ff e9 a4 fe ff ff 66 2e 0f 1f
[   50.317724] RSP: 0018:ffffb57fc1347d38 EFLAGS: 00010282
[   50.317725] RAX: 0000000000000000 RBX: ffff995a9e3e4000 RCX: 0000000000000007
[   50.317725] RDX: 0000000000000007 RSI: 0000000000000002 RDI: ffff995abe398f40
[   50.317725] RBP: 0000000000000004 R08: 0000000000000002 R09: 000000000002b500
[   50.317726] R10: 0000003a9dc62fa1 R11: 0000000000fed278 R12: 0000000000000004
[   50.317726] R13: 0000000000000004 R14: ffff995a9e3e4000 R15: ffff995a9e3e4000
[   50.317727] FS:  0000000000000000(0000) GS:ffff995abe380000(0000) knlGS:0000000000000000
[   50.317727] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   50.317727] CR2: 00007f4dbd7fae20 CR3: 0000000efbe0a004 CR4: 00000000003606e0
[   50.317728] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   50.317728] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   50.317728] Call Trace:
[   50.317734]  __igb_open+0x1ee/0x5c0 [igb]
[   50.317737]  igb_resume+0x193/0x1c0 [igb]
[   50.317739]  ? pci_pm_thaw+0x80/0x80
[   50.317741]  dpm_run_callback+0x4f/0x140
[   50.317742]  device_resume+0x107/0x180
[   50.317743]  async_resume+0x19/0x50
[   50.317744]  async_run_entry_fn+0x39/0x160
[   50.317746]  process_one_work+0x1a7/0x370
[   50.317747]  worker_thread+0x30/0x380
[   50.317748]  ? process_one_work+0x370/0x370
[   50.317749]  kthread+0x10c/0x130
[   50.317750]  ? kthread_park+0x80/0x80
[   50.317751]  ret_from_fork+0x35/0x40
[   50.317752] ---[ end trace 45a9ec6b02347b6e ]---
[   50.317753] ------------[ cut here ]------------
[   50.317753] RTNL: assertion failed at net/core/dev.c (2913)
[   50.317756] WARNING: CPU: 6 PID: 5287 at net/core/dev.c:2913 netif_set_real_num_rx_queues+0x79/0x80
[   50.317757] Modules linked in: rfcomm xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ipt_REJECT nf_rej
ect_ipv4 nft_counter nft_compat nf_tables nfnetlink tun bridge stp llc cmac bnep iTCO_wdt intel_wmi_thunderbolt iT
CO_vendor_support mxm_wmi wmi_bmof x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm
 snd_hda_codec_realtek irqbypass snd_hda_codec_generic ledtrig_audio btusb btrtl btbcm snd_hda_intel btintel snd_i
ntel_dspcfg snd_hda_codec bluetooth snd_hwdep snd_hda_core snd_seq crct10dif_pclmul crc32_pclmul joydev snd_seq_de
vice ghash_clmulni_intel intel_cstate snd_pcm mei_me intel_uncore snd_timer ecdh_generic snd ecc pcspkr mei rfkill
 i2c_i801 soundcore intel_rapl_perf sg wmi acpi_pad intel_pmc_core nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_
tables xfs libcrc32c sr_mod sd_mod cdrom t10_pi i915 intel_gtt drm_kms_helper syscopyarea sysfillrect sysimgblt fb
_sys_fops cec drm igb ahci libahci e1000e libata crc32c_intel dca i2c_algo_bit video
[   50.317766] CPU: 6 PID: 5287 Comm: kworker/u24:17 Tainted: G        W         5.6.0-rc2_next-queue_dev-queue_81
b6341+ #5
[   50.317766] Hardware name: Gigabyte Technology Co., Ltd. Z370 AORUS Gaming 5/Z370 AORUS Gaming 5-CF, BIOS F6 04
/03/2018
[   50.317767] Workqueue: events_unbound async_run_entry_fn
[   50.317768] RIP: 0010:netif_set_real_num_rx_queues+0x79/0x80
[   50.317768] Code: ff c3 80 3d 89 6c e7 00 00 75 db ba 61 0b 00 00 48 c7 c6 92 57 9a bd 48 c7 c7 e0 a4 91 bd c6
05 6d 6c e7 00 01 e8 a2 8a 97 ff <0f> 0b eb b8 0f 1f 00 0f 1f 44 00 00 53 f0 48 0f ba af d8 00 00 00
[   50.317769] RSP: 0018:ffffb57fc1347d58 EFLAGS: 00010282
[   50.317769] RAX: 0000000000000000 RBX: ffff995a9e3e4000 RCX: 0000000000000007
[   50.317769] RDX: 0000000000000007 RSI: 0000000000000002 RDI: ffff995abe398f40
[   50.317770] RBP: 0000000000000004 R08: 0000000000000002 R09: 000000000002b500
[   50.317770] R10: 0000003a9dc92851 R11: 0000000000fec568 R12: 0000000000000000
[   50.317770] R13: 0000000000000001 R14: ffff995a9e3e4000 R15: ffff995a9e3e4000
[   50.317771] FS:  0000000000000000(0000) GS:ffff995abe380000(0000) knlGS:0000000000000000
[   50.317771] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   50.317771] CR2: 00007f4dbd7fae20 CR3: 0000000efbe0a004 CR4: 00000000003606e0
[   50.317772] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   50.317772] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   50.317772] Call Trace:
[   50.317775]  __igb_open+0x208/0x5c0 [igb]
[   50.317777]  igb_resume+0x193/0x1c0 [igb]
[   50.317777]  ? pci_pm_thaw+0x80/0x80
[   50.317778]  dpm_run_callback+0x4f/0x140
[   50.317779]  device_resume+0x107/0x180
[   50.317780]  async_resume+0x19/0x50
[   50.317781]  async_run_entry_fn+0x39/0x160
[   50.317782]  process_one_work+0x1a7/0x370
[   50.317783]  worker_thread+0x30/0x380
[   50.317784]  ? process_one_work+0x370/0x370
[   50.317785]  kthread+0x10c/0x130
[   50.317785]  ? kthread_park+0x80/0x80
[   50.317786]  ret_from_fork+0x35/0x40
[   50.317787] ---[ end trace 45a9ec6b02347b6f ]---
[   50.560158] OOM killer enabled.
[   50.560158] Restarting tasks ... done.
[   50.560713] video LNXVIDEO:00: Restoring backlight state
[   50.560714] PM: suspend exit
[   50.601179] ata5: SATA link down (SStatus 4 SControl 300)
[   50.601201] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
...

^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock()
  2020-02-22  0:30 ` [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock() Brown, Aaron F
@ 2020-02-24 11:01   ` Kai-Heng Feng
  2020-03-20  7:00     ` Brown, Aaron F
  0 siblings, 1 reply; 8+ messages in thread
From: Kai-Heng Feng @ 2020-02-24 11:01 UTC (permalink / raw)
  To: Brown, Aaron F
  Cc: davem, mkubecek, Kirsher, Jeffrey T,
	open list:NETWORKING DRIVERS,
	moderated list:INTEL ETHERNET DRIVERS, open list



> On Feb 22, 2020, at 08:30, Brown, Aaron F <aaron.f.brown@intel.com> wrote:
> 
> 
> 
>> -----Original Message-----
>> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
>> Kai-Heng Feng
>> Sent: Friday, February 7, 2020 2:10 AM
>> To: davem@davemloft.net; mkubecek@suse.cz; Kirsher, Jeffrey T
>> <jeffrey.t.kirsher@intel.com>
>> Cc: open list:NETWORKING DRIVERS <netdev@vger.kernel.org>; Kai-Heng
>> Feng <kai.heng.feng@canonical.com>; moderated list:INTEL ETHERNET
>> DRIVERS <intel-wired-lan@lists.osuosl.org>; open list <linux-
>> kernel@vger.kernel.org>
>> Subject: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of
>> rtnl_lock()
>> 
>> Commit 9474933caf21 ("igb: close/suspend race in netif_device_detach")
>> fixed race condition between close and power management ops by using
>> rtnl_lock().
>> 
>> However we can achieve the same by using device_lock() since all power
>> management ops are protected by device_lock().
>> 
>> This fix is a preparation for next patch, to prevent a dead lock under
>> rtnl_lock() when calling runtime resume routine.
>> 
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> ---
>> v3:
>> - Fix unreleased lock reported by 0-day test bot.
>> v2:
>> - No change.
>> 
>> drivers/net/ethernet/intel/igb/igb_main.c | 14 ++++++++------
>> 1 file changed, 8 insertions(+), 6 deletions(-)
> 
> This patch introduces the following call trace / RIP when I sleep / resume (via rtcwake) a system that has an igb port with link up:  I'm not sure if it introduces the issue or just exposes / displays it as it only shows up on the first sleep / resume cycle and the systems I have that were stable for many sleep / resume cycles (arbitrarily 50+) continue to be so.  

I can't reproduce the issue here.

> -------------------------------------------------------------------------------------------------
> ...
> [   50.279436] usb usb3: root hub lost power or was reset
> [   50.279437] usb usb4: root hub lost power or was reset
> [   50.279491] sd 1:0:0:0: [sda] Starting disk
> [   50.317691] ------------[ cut here ]------------
> [   50.317692] RTNL: assertion failed at net/core/dev.c (2867)
> [   50.317700] WARNING: CPU: 6 PID: 5287 at net/core/dev.c:2867 netif_set_real_num_tx_queues+0x184/0x1a0
> [   50.317701] Modules linked in: rfcomm xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ipt_REJECT nf_rej
> ect_ipv4 nft_counter nft_compat nf_tables nfnetlink tun bridge stp llc cmac bnep iTCO_wdt intel_wmi_thunderbolt iT
> CO_vendor_support mxm_wmi wmi_bmof x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm
> snd_hda_codec_realtek irqbypass snd_hda_codec_generic ledtrig_audio btusb btrtl btbcm snd_hda_intel btintel snd_i
> ntel_dspcfg snd_hda_codec bluetooth snd_hwdep snd_hda_core snd_seq crct10dif_pclmul crc32_pclmul joydev snd_seq_de
> vice ghash_clmulni_intel intel_cstate snd_pcm mei_me intel_uncore snd_timer ecdh_generic snd ecc pcspkr mei rfkill
> i2c_i801 soundcore intel_rapl_perf sg wmi acpi_pad intel_pmc_core nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_
> tables xfs libcrc32c sr_mod sd_mod cdrom t10_pi i915 intel_gtt drm_kms_helper syscopyarea sysfillrect sysimgblt fb
> _sys_fops cec drm igb ahci libahci e1000e libata crc32c_intel dca i2c_algo_bit video
> [   50.317719] CPU: 6 PID: 5287 Comm: kworker/u24:17 Not tainted 5.6.0-rc2_next-queue_dev-queue_81b6341+ #5
> [   50.317720] Hardware name: Gigabyte Technology Co., Ltd. Z370 AORUS Gaming 5/Z370 AORUS Gaming 5-CF, BIOS F6 04
> /03/2018
> [   50.317722] Workqueue: events_unbound async_run_entry_fn
> [   50.317723] RIP: 0010:netif_set_real_num_tx_queues+0x184/0x1a0

I added some debug message and made sure the ASSERT_RTNL() was reached. However rtnl is locked for me.

> [   50.317724] Code: 43 1e e7 00 00 0f 85 fc fe ff ff ba 33 0b 00 00 48 c7 c6 92 57 9a bd 48 c7 c7 e0 a4 91 bd c6
> 05 23 1e e7 00 01 e8 57 3c 97 ff <0f> 0b e9 d6 fe ff ff 41 be ea ff ff ff e9 a4 fe ff ff 66 2e 0f 1f
> [   50.317724] RSP: 0018:ffffb57fc1347d38 EFLAGS: 00010282
> [   50.317725] RAX: 0000000000000000 RBX: ffff995a9e3e4000 RCX: 0000000000000007
> [   50.317725] RDX: 0000000000000007 RSI: 0000000000000002 RDI: ffff995abe398f40
> [   50.317725] RBP: 0000000000000004 R08: 0000000000000002 R09: 000000000002b500
> [   50.317726] R10: 0000003a9dc62fa1 R11: 0000000000fed278 R12: 0000000000000004
> [   50.317726] R13: 0000000000000004 R14: ffff995a9e3e4000 R15: ffff995a9e3e4000
> [   50.317727] FS:  0000000000000000(0000) GS:ffff995abe380000(0000) knlGS:0000000000000000
> [   50.317727] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   50.317727] CR2: 00007f4dbd7fae20 CR3: 0000000efbe0a004 CR4: 00000000003606e0
> [   50.317728] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [   50.317728] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [   50.317728] Call Trace:
> [   50.317734]  __igb_open+0x1ee/0x5c0 [igb]
> [   50.317737]  igb_resume+0x193/0x1c0 [igb]
> [   50.317739]  ? pci_pm_thaw+0x80/0x80

So this is hibernation instead of suspension. I tried both S3 and S4 and can't reproduce the issue.

Kai-Heng

> [   50.317741]  dpm_run_callback+0x4f/0x140
> [   50.317742]  device_resume+0x107/0x180
> [   50.317743]  async_resume+0x19/0x50
> [   50.317744]  async_run_entry_fn+0x39/0x160
> [   50.317746]  process_one_work+0x1a7/0x370
> [   50.317747]  worker_thread+0x30/0x380
> [   50.317748]  ? process_one_work+0x370/0x370
> [   50.317749]  kthread+0x10c/0x130
> [   50.317750]  ? kthread_park+0x80/0x80
> [   50.317751]  ret_from_fork+0x35/0x40
> [   50.317752] ---[ end trace 45a9ec6b02347b6e ]---
> [   50.317753] ------------[ cut here ]------------
> [   50.317753] RTNL: assertion failed at net/core/dev.c (2913)
> [   50.317756] WARNING: CPU: 6 PID: 5287 at net/core/dev.c:2913 netif_set_real_num_rx_queues+0x79/0x80
> [   50.317757] Modules linked in: rfcomm xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ipt_REJECT nf_rej
> ect_ipv4 nft_counter nft_compat nf_tables nfnetlink tun bridge stp llc cmac bnep iTCO_wdt intel_wmi_thunderbolt iT
> CO_vendor_support mxm_wmi wmi_bmof x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm
> snd_hda_codec_realtek irqbypass snd_hda_codec_generic ledtrig_audio btusb btrtl btbcm snd_hda_intel btintel snd_i
> ntel_dspcfg snd_hda_codec bluetooth snd_hwdep snd_hda_core snd_seq crct10dif_pclmul crc32_pclmul joydev snd_seq_de
> vice ghash_clmulni_intel intel_cstate snd_pcm mei_me intel_uncore snd_timer ecdh_generic snd ecc pcspkr mei rfkill
> i2c_i801 soundcore intel_rapl_perf sg wmi acpi_pad intel_pmc_core nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_
> tables xfs libcrc32c sr_mod sd_mod cdrom t10_pi i915 intel_gtt drm_kms_helper syscopyarea sysfillrect sysimgblt fb
> _sys_fops cec drm igb ahci libahci e1000e libata crc32c_intel dca i2c_algo_bit video
> [   50.317766] CPU: 6 PID: 5287 Comm: kworker/u24:17 Tainted: G        W         5.6.0-rc2_next-queue_dev-queue_81
> b6341+ #5
> [   50.317766] Hardware name: Gigabyte Technology Co., Ltd. Z370 AORUS Gaming 5/Z370 AORUS Gaming 5-CF, BIOS F6 04
> /03/2018
> [   50.317767] Workqueue: events_unbound async_run_entry_fn
> [   50.317768] RIP: 0010:netif_set_real_num_rx_queues+0x79/0x80
> [   50.317768] Code: ff c3 80 3d 89 6c e7 00 00 75 db ba 61 0b 00 00 48 c7 c6 92 57 9a bd 48 c7 c7 e0 a4 91 bd c6
> 05 6d 6c e7 00 01 e8 a2 8a 97 ff <0f> 0b eb b8 0f 1f 00 0f 1f 44 00 00 53 f0 48 0f ba af d8 00 00 00
> [   50.317769] RSP: 0018:ffffb57fc1347d58 EFLAGS: 00010282
> [   50.317769] RAX: 0000000000000000 RBX: ffff995a9e3e4000 RCX: 0000000000000007
> [   50.317769] RDX: 0000000000000007 RSI: 0000000000000002 RDI: ffff995abe398f40
> [   50.317770] RBP: 0000000000000004 R08: 0000000000000002 R09: 000000000002b500
> [   50.317770] R10: 0000003a9dc92851 R11: 0000000000fec568 R12: 0000000000000000
> [   50.317770] R13: 0000000000000001 R14: ffff995a9e3e4000 R15: ffff995a9e3e4000
> [   50.317771] FS:  0000000000000000(0000) GS:ffff995abe380000(0000) knlGS:0000000000000000
> [   50.317771] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   50.317771] CR2: 00007f4dbd7fae20 CR3: 0000000efbe0a004 CR4: 00000000003606e0
> [   50.317772] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [   50.317772] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [   50.317772] Call Trace:
> [   50.317775]  __igb_open+0x208/0x5c0 [igb]
> [   50.317777]  igb_resume+0x193/0x1c0 [igb]
> [   50.317777]  ? pci_pm_thaw+0x80/0x80
> [   50.317778]  dpm_run_callback+0x4f/0x140
> [   50.317779]  device_resume+0x107/0x180
> [   50.317780]  async_resume+0x19/0x50
> [   50.317781]  async_run_entry_fn+0x39/0x160
> [   50.317782]  process_one_work+0x1a7/0x370
> [   50.317783]  worker_thread+0x30/0x380
> [   50.317784]  ? process_one_work+0x370/0x370
> [   50.317785]  kthread+0x10c/0x130
> [   50.317785]  ? kthread_park+0x80/0x80
> [   50.317786]  ret_from_fork+0x35/0x40
> [   50.317787] ---[ end trace 45a9ec6b02347b6f ]---
> [   50.560158] OOM killer enabled.
> [   50.560158] Restarting tasks ... done.
> [   50.560713] video LNXVIDEO:00: Restoring backlight state
> [   50.560714] PM: suspend exit
> [   50.601179] ata5: SATA link down (SStatus 4 SControl 300)
> [   50.601201] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> ...


^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [PATCH v3 2/2] net-sysfs: Ensure begin/complete are called in speed_show() and duplex_show()
  2020-02-20  5:45   ` Kai-Heng Feng
@ 2020-03-11  3:30     ` Kai-Heng Feng
  0 siblings, 0 replies; 8+ messages in thread
From: Kai-Heng Feng @ 2020-03-11  3:30 UTC (permalink / raw)
  To: David Miller, Michal Kubecek, Jeff Kirsher
  Cc: Jakub Kicinski, Maxime Chevallier, Heiner Kallweit,
	Andy Shevchenko, Jouni Hogander, Eric Dumazet,
	Greg Kroah-Hartman, Wang Hai, YueHaibing, Kimberly Brown,
	Thomas Gleixner, Florian Fainelli, Jiri Pirko, Andrew Lunn,
	Li RongQing, open list, open list:NETWORKING [GENERAL]



> On Feb 20, 2020, at 13:45, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
> 
>> 
>> On Feb 7, 2020, at 18:10, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
>> 
>> Device like igb gets runtime suspended when there's no link partner. We
>> can't get correct speed under that state:
>> $ cat /sys/class/net/enp3s0/speed
>> 1000
>> 
>> In addition to that, an error can also be spotted in dmesg:
>> [  385.991957] igb 0000:03:00.0 enp3s0: PCIe link lost
>> 
>> It's because the igb device doesn't get runtime resumed before calling
>> get_link_ksettings().
>> 
>> So let's use a new helper to call begin() and complete() like what
>> dev_ethtool() does, to runtime resume/suspend or power up/down the
>> device properly.
>> 
>> Once this fix is in place, igb can show the speed correctly without link
>> partner:
>> $ cat /sys/class/net/enp3s0/speed
>> -1
>> 
>> -1 here means SPEED_UNKNOWN, which is the correct value when igb is
>> runtime suspended.
>> 
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> 
> A gentle ping...

Another gentle ping...

> 
> Kai-Heng
> 
>> ---
>> v3:
>> - Specify -1 means SPEED_UNKNOWN.
>> v2:
>> - Add a new helper with begin/complete and use it in net-sysfs.
>> 
>> include/linux/ethtool.h |  4 ++++
>> net/core/net-sysfs.c    |  4 ++--
>> net/ethtool/ioctl.c     | 33 ++++++++++++++++++++++++++++++++-
>> 3 files changed, 38 insertions(+), 3 deletions(-)
>> 
>> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
>> index 95991e4300bf..785ec1921417 100644
>> --- a/include/linux/ethtool.h
>> +++ b/include/linux/ethtool.h
>> @@ -160,6 +160,10 @@ extern int
>> __ethtool_get_link_ksettings(struct net_device *dev,
>> 			     struct ethtool_link_ksettings *link_ksettings);
>> 
>> +extern int
>> +__ethtool_get_link_ksettings_full(struct net_device *dev,
>> +				  struct ethtool_link_ksettings *link_ksettings);
>> +
>> /**
>> * ethtool_intersect_link_masks - Given two link masks, AND them together
>> * @dst: first mask and where result is stored
>> diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
>> index 4c826b8bf9b1..a199e15a080f 100644
>> --- a/net/core/net-sysfs.c
>> +++ b/net/core/net-sysfs.c
>> @@ -201,7 +201,7 @@ static ssize_t speed_show(struct device *dev,
>> 	if (netif_running(netdev)) {
>> 		struct ethtool_link_ksettings cmd;
>> 
>> -		if (!__ethtool_get_link_ksettings(netdev, &cmd))
>> +		if (!__ethtool_get_link_ksettings_full(netdev, &cmd))
>> 			ret = sprintf(buf, fmt_dec, cmd.base.speed);
>> 	}
>> 	rtnl_unlock();
>> @@ -221,7 +221,7 @@ static ssize_t duplex_show(struct device *dev,
>> 	if (netif_running(netdev)) {
>> 		struct ethtool_link_ksettings cmd;
>> 
>> -		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
>> +		if (!__ethtool_get_link_ksettings_full(netdev, &cmd)) {
>> 			const char *duplex;
>> 
>> 			switch (cmd.base.duplex) {
>> diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
>> index b987052d91ef..faeba247c1fb 100644
>> --- a/net/ethtool/ioctl.c
>> +++ b/net/ethtool/ioctl.c
>> @@ -420,7 +420,9 @@ struct ethtool_link_usettings {
>> 	} link_modes;
>> };
>> 
>> -/* Internal kernel helper to query a device ethtool_link_settings. */
>> +/* Internal kernel helper to query a device ethtool_link_settings. To be called
>> + * inside begin/complete block.
>> + */
>> int __ethtool_get_link_ksettings(struct net_device *dev,
>> 				 struct ethtool_link_ksettings *link_ksettings)
>> {
>> @@ -434,6 +436,35 @@ int __ethtool_get_link_ksettings(struct net_device *dev,
>> }
>> EXPORT_SYMBOL(__ethtool_get_link_ksettings);
>> 
>> +/* Internal kernel helper to query a device ethtool_link_settings. To be called
>> + * outside of begin/complete block.
>> + */
>> +int __ethtool_get_link_ksettings_full(struct net_device *dev,
>> +				      struct ethtool_link_ksettings *link_ksettings)
>> +{
>> +	int rc;
>> +
>> +	ASSERT_RTNL();
>> +
>> +	if (!dev->ethtool_ops->get_link_ksettings)
>> +		return -EOPNOTSUPP;
>> +
>> +	if (dev->ethtool_ops->begin) {
>> +		rc = dev->ethtool_ops->begin(dev);
>> +		if (rc  < 0)
>> +			return rc;
>> +	}
>> +
>> +	memset(link_ksettings, 0, sizeof(*link_ksettings));
>> +	rc = dev->ethtool_ops->get_link_ksettings(dev, link_ksettings);
>> +
>> +	if (dev->ethtool_ops->complete)
>> +		dev->ethtool_ops->complete(dev);
>> +
>> +	return rc;
>> +}
>> +EXPORT_SYMBOL(__ethtool_get_link_ksettings_full);
>> +
>> /* convert ethtool_link_usettings in user space to a kernel internal
>> * ethtool_link_ksettings. return 0 on success, errno on error.
>> */
>> -- 
>> 2.17.1


^ permalink raw reply	[flat|nested] 8+ messages in thread
* RE: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock()
  2020-02-24 11:01   ` Kai-Heng Feng
@ 2020-03-20  7:00     ` Brown, Aaron F
  2020-03-25  9:42       ` Kai-Heng Feng
  0 siblings, 1 reply; 8+ messages in thread
From: Brown, Aaron F @ 2020-03-20  7:00 UTC (permalink / raw)
  To: Kai-Heng Feng
  Cc: davem, mkubecek, Kirsher, Jeffrey T,
	open list:NETWORKING DRIVERS,
	moderated list:INTEL ETHERNET DRIVERS, open list

> From: Kai-Heng Feng <kai.heng.feng@canonical.com>
> Sent: Monday, February 24, 2020 3:02 AM
> To: Brown, Aaron F <aaron.f.brown@intel.com>
> Cc: davem@davemloft.net; mkubecek@suse.cz; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@intel.com>; open list:NETWORKING DRIVERS
> <netdev@vger.kernel.org>; moderated list:INTEL ETHERNET DRIVERS <intel-
> wired-lan@lists.osuosl.org>; open list <linux-kernel@vger.kernel.org>
> Subject: Re: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of
> rtnl_lock()
> 
> 
> 
> > On Feb 22, 2020, at 08:30, Brown, Aaron F <aaron.f.brown@intel.com> wrote:
> >
> >
> >
> >> -----Original Message-----
> >> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> >> Kai-Heng Feng
> >> Sent: Friday, February 7, 2020 2:10 AM
> >> To: davem@davemloft.net; mkubecek@suse.cz; Kirsher, Jeffrey T
> >> <jeffrey.t.kirsher@intel.com>
> >> Cc: open list:NETWORKING DRIVERS <netdev@vger.kernel.org>; Kai-Heng
> >> Feng <kai.heng.feng@canonical.com>; moderated list:INTEL ETHERNET
> >> DRIVERS <intel-wired-lan@lists.osuosl.org>; open list <linux-
> >> kernel@vger.kernel.org>
> >> Subject: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of
> >> rtnl_lock()
> >>
> >> Commit 9474933caf21 ("igb: close/suspend race in netif_device_detach")
> >> fixed race condition between close and power management ops by using
> >> rtnl_lock().
> >>
> >> However we can achieve the same by using device_lock() since all power
> >> management ops are protected by device_lock().
> >>
> >> This fix is a preparation for next patch, to prevent a dead lock under
> >> rtnl_lock() when calling runtime resume routine.
> >>
> >> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> >> ---
> >> v3:
> >> - Fix unreleased lock reported by 0-day test bot.
> >> v2:
> >> - No change.
> >>
> >> drivers/net/ethernet/intel/igb/igb_main.c | 14 ++++++++------
> >> 1 file changed, 8 insertions(+), 6 deletions(-)
> >
> > This patch introduces the following call trace / RIP when I sleep / resume (via
> rtcwake) a system that has an igb port with link up:  I'm not sure if it introduces
> the issue or just exposes / displays it as it only shows up on the first sleep /
> resume cycle and the systems I have that were stable for many sleep / resume
> cycles (arbitrarily 50+) continue to be so.
> 
> I can't reproduce the issue here.
> 

I just got back to looking at the igb driver and  found a similar call trace / RIP with this patch.  Turns out any of my igb systems will freeze if the igb driver is unloaded while the interface is logically up with link.  The system continues to run if I switch to another console, but any attempt to look at the network (ifconfig, ethtool, etc...) makes that other session freeze up.  Then about 5 minutes later a trace appears on the screen and continues to do so every few minutes.  Here's what I pulled out of the system log for this instance:
-----------------------------------------------------------------------------------------------------
Mar 20 04:11:40 u1458 kernel: igb 0000:09:00.0 eth2: igb: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
Mar 20 04:14:54 u1458 kernel: INFO: task kworker/7:1:53 blocked for more than 122 seconds.
Mar 20 04:14:54 u1458 kernel:      Not tainted 5.6.0-rc5_next-queue_dev-queue_a601740+ #24
Mar 20 04:14:54 u1458 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 20 04:14:54 u1458 kernel: kworker/7:1     D    0    53      2 0x80004000
Mar 20 04:14:54 u1458 kernel: Workqueue: events linkwatch_event
Mar 20 04:14:54 u1458 kernel: Call Trace:
Mar 20 04:14:54 u1458 kernel: ? __schedule+0x2ca/0x6e0
Mar 20 04:14:54 u1458 kernel: schedule+0x4a/0xb0
Mar 20 04:14:54 u1458 kernel: schedule_preempt_disabled+0xa/0x10
Mar 20 04:14:54 u1458 kernel: __mutex_lock.isra.11+0x233/0x4e0
Mar 20 04:14:54 u1458 kernel: ? igb_watchdog_task+0x2ef/0x770 [igb]
Mar 20 04:14:54 u1458 kernel: linkwatch_event+0xa/0x30
Mar 20 04:14:54 u1458 kernel: process_one_work+0x172/0x380
Mar 20 04:14:54 u1458 kernel: worker_thread+0x49/0x3f0
Mar 20 04:14:54 u1458 kernel: kthread+0xf8/0x130
Mar 20 04:14:54 u1458 kernel: ? max_active_store+0x80/0x80
Mar 20 04:14:54 u1458 kernel: ? kthread_bind+0x10/0x10
Mar 20 04:14:54 u1458 kernel: ret_from_fork+0x35/0x40
Mar 20 04:14:54 u1458 kernel: INFO: task kworker/1:1:174 blocked for more than 122 seconds.
Mar 20 04:14:54 u1458 kernel:      Not tainted 5.6.0-rc5_next-queue_dev-queue_a601740+ #24
Mar 20 04:14:54 u1458 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 20 04:14:54 u1458 kernel: kworker/1:1     D    0   174      2 0x80004000
Mar 20 04:14:54 u1458 kernel: Workqueue: ipv6_addrconf addrconf_dad_work
Mar 20 04:14:54 u1458 kernel: Call Trace:
Mar 20 04:14:54 u1458 kernel: ? __schedule+0x2ca/0x6e0
Mar 20 04:14:54 u1458 kernel: schedule+0x4a/0xb0
Mar 20 04:14:54 u1458 kernel: schedule_preempt_disabled+0xa/0x10
Mar 20 04:14:54 u1458 kernel: __mutex_lock.isra.11+0x233/0x4e0
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x40/0x70
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x40/0x70
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x34/0x70
Mar 20 04:14:54 u1458 kernel: addrconf_dad_work+0x3e/0x5b0
Mar 20 04:14:54 u1458 kernel: ? __switch_to+0x7a/0x3e0
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x34/0x70
Mar 20 04:14:54 u1458 kernel: process_one_work+0x172/0x380
Mar 20 04:14:54 u1458 kernel: worker_thread+0x49/0x3f0
Mar 20 04:14:54 u1458 kernel: kthread+0xf8/0x130
Mar 20 04:14:54 u1458 kernel: ? max_active_store+0x80/0x80
Mar 20 04:14:54 u1458 kernel: ? kthread_bind+0x10/0x10
Mar 20 04:14:54 u1458 kernel: ret_from_fork+0x35/0x40
Mar 20 04:14:54 u1458 kernel: INFO: task kworker/2:1:5008 blocked for more than 122 seconds.
Mar 20 04:14:54 u1458 kernel:      Not tainted 5.6.0-rc5_next-queue_dev-queue_a601740+ #24
Mar 20 04:14:54 u1458 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 20 04:14:54 u1458 kernel: kworker/2:1     D    0  5008      2 0x80004000
Mar 20 04:14:54 u1458 kernel: Workqueue: ipv6_addrconf addrconf_dad_work
Mar 20 04:14:54 u1458 kernel: Call Trace:
Mar 20 04:14:54 u1458 kernel: ? __schedule+0x2ca/0x6e0
Mar 20 04:14:54 u1458 kernel: schedule+0x4a/0xb0
Mar 20 04:14:54 u1458 kernel: schedule_preempt_disabled+0xa/0x10
Mar 20 04:14:54 u1458 kernel: __mutex_lock.isra.11+0x233/0x4e0
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x40/0x70
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x40/0x70
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x34/0x70
Mar 20 04:14:54 u1458 kernel: addrconf_dad_work+0x3e/0x5b0
Mar 20 04:14:54 u1458 kernel: ? __switch_to+0x7a/0x3e0
Mar 20 04:14:54 u1458 kernel: ? __switch_to_asm+0x34/0x70
Mar 20 04:14:54 u1458 kernel: process_one_work+0x172/0x380
Mar 20 04:14:54 u1458 kernel: worker_thread+0x49/0x3f0
Mar 20 04:14:54 u1458 kernel: kthread+0xf8/0x130
Mar 20 04:14:54 u1458 kernel: ? max_active_store+0x80/0x80
Mar 20 04:14:54 u1458 kernel: ? kthread_bind+0x10/0x10
Mar 20 04:14:54 u1458 kernel: ret_from_fork+0x35/0x40
Mar 20 04:14:54 u1458 kernel: INFO: task rmmod:5322 blocked for more than 122 seconds.
Mar 20 04:14:54 u1458 kernel:      Not tainted 5.6.0-rc5_next-queue_dev-queue_a601740+ #24
Mar 20 04:14:54 u1458 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 20 04:14:54 u1458 kernel: rmmod           D    0  5322   4580 0x00004000
Mar 20 04:14:54 u1458 kernel: Call Trace:
Mar 20 04:14:54 u1458 kernel: ? __schedule+0x2ca/0x6e0
Mar 20 04:14:54 u1458 kernel: schedule+0x4a/0xb0
Mar 20 04:14:54 u1458 kernel: schedule_preempt_disabled+0xa/0x10
Mar 20 04:14:54 u1458 kernel: __mutex_lock.isra.11+0x233/0x4e0
Mar 20 04:14:54 u1458 kernel: igb_close+0x22/0x60 [igb]
Mar 20 04:14:54 u1458 kernel: __dev_close_many+0x96/0x100
Mar 20 04:14:54 u1458 kernel: dev_close_many+0x96/0x150
Mar 20 04:14:54 u1458 kernel: rollback_registered_many+0x140/0x530
Mar 20 04:14:54 u1458 kernel: rollback_registered+0x56/0x90
Mar 20 04:14:54 u1458 kernel: unregister_netdevice_queue+0x7e/0x100
Mar 20 04:14:54 u1458 kernel: unregister_netdev+0x18/0x20
Mar 20 04:14:54 u1458 kernel: igb_remove+0xa3/0x160 [igb]
Mar 20 04:14:54 u1458 kernel: pci_device_remove+0x3b/0xc0
Mar 20 04:14:54 u1458 kernel: device_release_driver_internal+0xec/0x1b0
Mar 20 04:14:54 u1458 kernel: driver_detach+0x46/0x90
Mar 20 04:14:54 u1458 kernel: bus_remove_driver+0x58/0xd0
Mar 20 04:14:54 u1458 kernel: pci_unregister_driver+0x26/0xa0
Mar 20 04:14:54 u1458 kernel: __x64_sys_delete_module+0x16c/0x260
Mar 20 04:14:54 u1458 kernel: ? exit_to_usermode_loop+0xa4/0xcf
Mar 20 04:14:54 u1458 kernel: do_syscall_64+0x5b/0x1d0
Mar 20 04:14:54 u1458 kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9
Mar 20 04:14:54 u1458 kernel: RIP: 0033:0x7f1aab487397
Mar 20 04:14:54 u1458 kernel: Code: Bad RIP value.
Mar 20 04:14:54 u1458 kernel: RSP: 002b:00007ffebcda13a8 EFLAGS: 00000202 ORIG_RAX: 00000000000000b0
Mar 20 04:14:54 u1458 kernel: RAX: ffffffffffffffda RBX: 000000000098e190 RCX: 00007f1aab487397
Mar 20 04:14:54 u1458 kernel: RDX: 00007f1aab4fbb20 RSI: 0000000000000800 RDI: 000000000098e1f8
Mar 20 04:14:54 u1458 kernel: RBP: 0000000000000000 R08: 00007f1aab750060 R09: 00007f1aab4fbb20
Mar 20 04:14:54 u1458 kernel: R10: 00007ffebcda0f70 R11: 0000000000000202 R12: 00007ffebcda2703
Mar 20 04:14:54 u1458 kernel: R13: 0000000000000000 R14: 000000000098e190 R15: 000000000098e010
-----------------------------------------------------------------------------------------------------

> > -----------------------------------------------------------------------------------------------
> --
> > ...
> > [   50.279436] usb usb3: root hub lost power or was reset
> > [   50.279437] usb usb4: root hub lost power or was reset
> > [   50.279491] sd 1:0:0:0: [sda] Starting disk
> > [   50.317691] ------------[ cut here ]------------
> > [   50.317692] RTNL: assertion failed at net/core/dev.c (2867)
> > [   50.317700] WARNING: CPU: 6 PID: 5287 at net/core/dev.c:2867
> netif_set_real_num_tx_queues+0x184/0x1a0
> > [   50.317701] Modules linked in: rfcomm xt_conntrack nf_conntrack
> nf_defrag_ipv6 nf_defrag_ipv4 ipt_REJECT nf_rej
> > ect_ipv4 nft_counter nft_compat nf_tables nfnetlink tun bridge stp llc cmac
> bnep iTCO_wdt intel_wmi_thunderbolt iT
> > CO_vendor_support mxm_wmi wmi_bmof x86_pkg_temp_thermal
> intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm
> > snd_hda_codec_realtek irqbypass snd_hda_codec_generic ledtrig_audio btusb
> btrtl btbcm snd_hda_intel btintel snd_i
> > ntel_dspcfg snd_hda_codec bluetooth snd_hwdep snd_hda_core snd_seq
> crct10dif_pclmul crc32_pclmul joydev snd_seq_de
> > vice ghash_clmulni_intel intel_cstate snd_pcm mei_me intel_uncore snd_timer
> ecdh_generic snd ecc pcspkr mei rfkill
> > i2c_i801 soundcore intel_rapl_perf sg wmi acpi_pad intel_pmc_core nfsd
> auth_rpcgss nfs_acl lockd grace sunrpc ip_
> > tables xfs libcrc32c sr_mod sd_mod cdrom t10_pi i915 intel_gtt
> drm_kms_helper syscopyarea sysfillrect sysimgblt fb
> > _sys_fops cec drm igb ahci libahci e1000e libata crc32c_intel dca i2c_algo_bit
> video
> > [   50.317719] CPU: 6 PID: 5287 Comm: kworker/u24:17 Not tainted 5.6.0-
> rc2_next-queue_dev-queue_81b6341+ #5
> > [   50.317720] Hardware name: Gigabyte Technology Co., Ltd. Z370 AORUS
> Gaming 5/Z370 AORUS Gaming 5-CF, BIOS F6 04
> > /03/2018
> > [   50.317722] Workqueue: events_unbound async_run_entry_fn
> > [   50.317723] RIP: 0010:netif_set_real_num_tx_queues+0x184/0x1a0
> 
> I added some debug message and made sure the ASSERT_RTNL() was reached.
> However rtnl is locked for me.
> 
> > [   50.317724] Code: 43 1e e7 00 00 0f 85 fc fe ff ff ba 33 0b 00 00 48 c7 c6 92
> 57 9a bd 48 c7 c7 e0 a4 91 bd c6
> > 05 23 1e e7 00 01 e8 57 3c 97 ff <0f> 0b e9 d6 fe ff ff 41 be ea ff ff ff e9 a4 fe
> ff ff 66 2e 0f 1f
> > [   50.317724] RSP: 0018:ffffb57fc1347d38 EFLAGS: 00010282
> > [   50.317725] RAX: 0000000000000000 RBX: ffff995a9e3e4000 RCX:
> 0000000000000007
> > [   50.317725] RDX: 0000000000000007 RSI: 0000000000000002 RDI:
> ffff995abe398f40
> > [   50.317725] RBP: 0000000000000004 R08: 0000000000000002 R09:
> 000000000002b500
> > [   50.317726] R10: 0000003a9dc62fa1 R11: 0000000000fed278 R12:
> 0000000000000004
> > [   50.317726] R13: 0000000000000004 R14: ffff995a9e3e4000 R15:
> ffff995a9e3e4000
> > [   50.317727] FS:  0000000000000000(0000) GS:ffff995abe380000(0000)
> knlGS:0000000000000000
> > [   50.317727] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [   50.317727] CR2: 00007f4dbd7fae20 CR3: 0000000efbe0a004 CR4:
> 00000000003606e0
> > [   50.317728] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> > [   50.317728] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> > [   50.317728] Call Trace:
> > [   50.317734]  __igb_open+0x1ee/0x5c0 [igb]
> > [   50.317737]  igb_resume+0x193/0x1c0 [igb]
> > [   50.317739]  ? pci_pm_thaw+0x80/0x80
> 
> So this is hibernation instead of suspension. I tried both S3 and S4 and can't
> reproduce the issue.

I used rtc-wake with all the modes in /sys/power/state.  At the time I was thinking it was a good way to exercise various power states.
> 
> Kai-Heng
> 
> > [   50.317741]  dpm_run_callback+0x4f/0x140
> > [   50.317742]  device_resume+0x107/0x180
> > [   50.317743]  async_resume+0x19/0x50
> > [   50.317744]  async_run_entry_fn+0x39/0x160
> > [   50.317746]  process_one_work+0x1a7/0x370
> > [   50.317747]  worker_thread+0x30/0x380
> > [   50.317748]  ? process_one_work+0x370/0x370
> > [   50.317749]  kthread+0x10c/0x130
> > [   50.317750]  ? kthread_park+0x80/0x80
> > [   50.317751]  ret_from_fork+0x35/0x40
> > [   50.317752] ---[ end trace 45a9ec6b02347b6e ]---
> > [   50.317753] ------------[ cut here ]------------
> > [   50.317753] RTNL: assertion failed at net/core/dev.c (2913)
> > [   50.317756] WARNING: CPU: 6 PID: 5287 at net/core/dev.c:2913
> netif_set_real_num_rx_queues+0x79/0x80
> > [   50.317757] Modules linked in: rfcomm xt_conntrack nf_conntrack
> nf_defrag_ipv6 nf_defrag_ipv4 ipt_REJECT nf_rej
> > ect_ipv4 nft_counter nft_compat nf_tables nfnetlink tun bridge stp llc cmac
> bnep iTCO_wdt intel_wmi_thunderbolt iT
> > CO_vendor_support mxm_wmi wmi_bmof x86_pkg_temp_thermal
> intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm
> > snd_hda_codec_realtek irqbypass snd_hda_codec_generic ledtrig_audio btusb
> btrtl btbcm snd_hda_intel btintel snd_i
> > ntel_dspcfg snd_hda_codec bluetooth snd_hwdep snd_hda_core snd_seq
> crct10dif_pclmul crc32_pclmul joydev snd_seq_de
> > vice ghash_clmulni_intel intel_cstate snd_pcm mei_me intel_uncore snd_timer
> ecdh_generic snd ecc pcspkr mei rfkill
> > i2c_i801 soundcore intel_rapl_perf sg wmi acpi_pad intel_pmc_core nfsd
> auth_rpcgss nfs_acl lockd grace sunrpc ip_
> > tables xfs libcrc32c sr_mod sd_mod cdrom t10_pi i915 intel_gtt
> drm_kms_helper syscopyarea sysfillrect sysimgblt fb
> > _sys_fops cec drm igb ahci libahci e1000e libata crc32c_intel dca i2c_algo_bit
> video
> > [   50.317766] CPU: 6 PID: 5287 Comm: kworker/u24:17 Tainted: G        W
> 5.6.0-rc2_next-queue_dev-queue_81
> > b6341+ #5
> > [   50.317766] Hardware name: Gigabyte Technology Co., Ltd. Z370 AORUS
> Gaming 5/Z370 AORUS Gaming 5-CF, BIOS F6 04
> > /03/2018
> > [   50.317767] Workqueue: events_unbound async_run_entry_fn
> > [   50.317768] RIP: 0010:netif_set_real_num_rx_queues+0x79/0x80
> > [   50.317768] Code: ff c3 80 3d 89 6c e7 00 00 75 db ba 61 0b 00 00 48 c7 c6
> 92 57 9a bd 48 c7 c7 e0 a4 91 bd c6
> > 05 6d 6c e7 00 01 e8 a2 8a 97 ff <0f> 0b eb b8 0f 1f 00 0f 1f 44 00 00 53 f0 48
> 0f ba af d8 00 00 00
> > [   50.317769] RSP: 0018:ffffb57fc1347d58 EFLAGS: 00010282
> > [   50.317769] RAX: 0000000000000000 RBX: ffff995a9e3e4000 RCX:
> 0000000000000007
> > [   50.317769] RDX: 0000000000000007 RSI: 0000000000000002 RDI:
> ffff995abe398f40
> > [   50.317770] RBP: 0000000000000004 R08: 0000000000000002 R09:
> 000000000002b500
> > [   50.317770] R10: 0000003a9dc92851 R11: 0000000000fec568 R12:
> 0000000000000000
> > [   50.317770] R13: 0000000000000001 R14: ffff995a9e3e4000 R15:
> ffff995a9e3e4000
> > [   50.317771] FS:  0000000000000000(0000) GS:ffff995abe380000(0000)
> knlGS:0000000000000000
> > [   50.317771] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [   50.317771] CR2: 00007f4dbd7fae20 CR3: 0000000efbe0a004 CR4:
> 00000000003606e0
> > [   50.317772] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> > [   50.317772] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> > [   50.317772] Call Trace:
> > [   50.317775]  __igb_open+0x208/0x5c0 [igb]
> > [   50.317777]  igb_resume+0x193/0x1c0 [igb]
> > [   50.317777]  ? pci_pm_thaw+0x80/0x80
> > [   50.317778]  dpm_run_callback+0x4f/0x140
> > [   50.317779]  device_resume+0x107/0x180
> > [   50.317780]  async_resume+0x19/0x50
> > [   50.317781]  async_run_entry_fn+0x39/0x160
> > [   50.317782]  process_one_work+0x1a7/0x370
> > [   50.317783]  worker_thread+0x30/0x380
> > [   50.317784]  ? process_one_work+0x370/0x370
> > [   50.317785]  kthread+0x10c/0x130
> > [   50.317785]  ? kthread_park+0x80/0x80
> > [   50.317786]  ret_from_fork+0x35/0x40
> > [   50.317787] ---[ end trace 45a9ec6b02347b6f ]---
> > [   50.560158] OOM killer enabled.
> > [   50.560158] Restarting tasks ... done.
> > [   50.560713] video LNXVIDEO:00: Restoring backlight state
> > [   50.560714] PM: suspend exit
> > [   50.601179] ata5: SATA link down (SStatus 4 SControl 300)
> > [   50.601201] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> > ...


^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock()
  2020-03-20  7:00     ` Brown, Aaron F
@ 2020-03-25  9:42       ` Kai-Heng Feng
  0 siblings, 0 replies; 8+ messages in thread
From: Kai-Heng Feng @ 2020-03-25  9:42 UTC (permalink / raw)
  To: Brown, Aaron F
  Cc: davem, mkubecek, Kirsher, Jeffrey T,
	open list:NETWORKING DRIVERS,
	moderated list:INTEL ETHERNET DRIVERS, open list

Hi Aaron,

> On Mar 20, 2020, at 15:00, Brown, Aaron F <aaron.f.brown@intel.com> wrote:
> 
>> From: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> Sent: Monday, February 24, 2020 3:02 AM
>> To: Brown, Aaron F <aaron.f.brown@intel.com>
>> Cc: davem@davemloft.net; mkubecek@suse.cz; Kirsher, Jeffrey T
>> <jeffrey.t.kirsher@intel.com>; open list:NETWORKING DRIVERS
>> <netdev@vger.kernel.org>; moderated list:INTEL ETHERNET DRIVERS <intel-
>> wired-lan@lists.osuosl.org>; open list <linux-kernel@vger.kernel.org>
>> Subject: Re: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of
>> rtnl_lock()
>> 
>> 
>> 
>>> On Feb 22, 2020, at 08:30, Brown, Aaron F <aaron.f.brown@intel.com> wrote:
>>> 
>>> 
>>> 
>>>> -----Original Message-----
>>>> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
>>>> Kai-Heng Feng
>>>> Sent: Friday, February 7, 2020 2:10 AM
>>>> To: davem@davemloft.net; mkubecek@suse.cz; Kirsher, Jeffrey T
>>>> <jeffrey.t.kirsher@intel.com>
>>>> Cc: open list:NETWORKING DRIVERS <netdev@vger.kernel.org>; Kai-Heng
>>>> Feng <kai.heng.feng@canonical.com>; moderated list:INTEL ETHERNET
>>>> DRIVERS <intel-wired-lan@lists.osuosl.org>; open list <linux-
>>>> kernel@vger.kernel.org>
>>>> Subject: [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of
>>>> rtnl_lock()
>>>> 
>>>> Commit 9474933caf21 ("igb: close/suspend race in netif_device_detach")
>>>> fixed race condition between close and power management ops by using
>>>> rtnl_lock().
>>>> 
>>>> However we can achieve the same by using device_lock() since all power
>>>> management ops are protected by device_lock().
>>>> 
>>>> This fix is a preparation for next patch, to prevent a dead lock under
>>>> rtnl_lock() when calling runtime resume routine.
>>>> 
>>>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>>>> ---
>>>> v3:
>>>> - Fix unreleased lock reported by 0-day test bot.
>>>> v2:
>>>> - No change.
>>>> 
>>>> drivers/net/ethernet/intel/igb/igb_main.c | 14 ++++++++------
>>>> 1 file changed, 8 insertions(+), 6 deletions(-)
>>> 
>>> This patch introduces the following call trace / RIP when I sleep / resume (via
>> rtcwake) a system that has an igb port with link up:  I'm not sure if it introduces
>> the issue or just exposes / displays it as it only shows up on the first sleep /
>> resume cycle and the systems I have that were stable for many sleep / resume
>> cycles (arbitrarily 50+) continue to be so.
>> 
>> I can't reproduce the issue here.
>> 
> 
> I just got back to looking at the igb driver and  found a similar call trace / RIP with this patch.  Turns out any of my igb systems will freeze if the igb driver is unloaded while the interface is logically up with link.  The system continues to run if I switch to another console, but any attempt to look at the network (ifconfig, ethtool, etc...) makes that other session freeze up.  Then about 5 minutes later a trace appears on the screen and continues to do so every few minutes.  Here's what I pulled out of the system log for this instance:

Yes I can reproduce the bug by removing the module while link is up.
I am currently finding a fix for this issue.

Kai-Heng


^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2020-03-25  9:42 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-02-07 10:10 [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock() Kai-Heng Feng
2020-02-07 10:10 ` [PATCH v3 2/2] net-sysfs: Ensure begin/complete are called in speed_show() and duplex_show() Kai-Heng Feng
2020-02-20  5:45   ` Kai-Heng Feng
2020-03-11  3:30     ` Kai-Heng Feng
2020-02-22  0:30 ` [Intel-wired-lan] [PATCH v3 1/2] igb: Use device_lock() insead of rtnl_lock() Brown, Aaron F
2020-02-24 11:01   ` Kai-Heng Feng
2020-03-20  7:00     ` Brown, Aaron F
2020-03-25  9:42       ` Kai-Heng Feng

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