From: Ivan Vecera <ivecera@redhat.com>
To: netdev@vger.kernel.org
Cc: poros@redhat.com, Jesse Brandeburg <jesse.brandeburg@intel.com>,
Tony Nguyen <anthony.l.nguyen@intel.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Slawomir Laba <slawomirx.laba@intel.com>,
Mateusz Palczewski <mateusz.palczewski@intel.com>,
Jacob Keller <jacob.e.keller@intel.com>,
Phani Burra <phani.r.burra@intel.com>,
intel-wired-lan@lists.osuosl.org (moderated list:INTEL ETHERNET
DRIVERS), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] iavf: Fix hang during reboot/shutdown
Date: Thu, 17 Mar 2022 11:45:24 +0100 [thread overview]
Message-ID: <20220317104524.2802848-1-ivecera@redhat.com> (raw)
Recent commit 974578017fc1 ("iavf: Add waiting so the port is
initialized in remove") adds a wait-loop at the beginning of
iavf_remove() to ensure that port initialization is finished
prior unregistering net device. This causes a regression
in reboot/shutdown scenario because in this case callback
iavf_shutdown() is called and this callback detaches the device,
makes it down if it is running and sets its state to __IAVF_REMOVE.
Later shutdown callback of associated PF driver (e.g. ice_shutdown)
is called. That callback calls among other things sriov_disable()
that calls indirectly iavf_remove() (see stack trace below).
As the adapter state is already __IAVF_REMOVE then the mentioned
loop is end-less and shutdown process hangs.
The patch fixes this by checking adapter's state at the beginning
of iavf_remove() and skips the rest of the function if the adapter
is already in remove state (shutdown is in progress).
Reproducer:
1. Create VF on PF driven by ice or i40e driver
2. Ensure that the VF is bound to iavf driver
3. Reboot
[52625.981294] sysrq: SysRq : Show Blocked State
[52625.988377] task:reboot state:D stack: 0 pid:17359 ppid: 1 f2
[52625.996732] Call Trace:
[52625.999187] __schedule+0x2d1/0x830
[52626.007400] schedule+0x35/0xa0
[52626.010545] schedule_hrtimeout_range_clock+0x83/0x100
[52626.020046] usleep_range+0x5b/0x80
[52626.023540] iavf_remove+0x63/0x5b0 [iavf]
[52626.027645] pci_device_remove+0x3b/0xc0
[52626.031572] device_release_driver_internal+0x103/0x1f0
[52626.036805] pci_stop_bus_device+0x72/0xa0
[52626.040904] pci_stop_and_remove_bus_device+0xe/0x20
[52626.045870] pci_iov_remove_virtfn+0xba/0x120
[52626.050232] sriov_disable+0x2f/0xe0
[52626.053813] ice_free_vfs+0x7c/0x340 [ice]
[52626.057946] ice_remove+0x220/0x240 [ice]
[52626.061967] ice_shutdown+0x16/0x50 [ice]
[52626.065987] pci_device_shutdown+0x34/0x60
[52626.070086] device_shutdown+0x165/0x1c5
[52626.074011] kernel_restart+0xe/0x30
[52626.077593] __do_sys_reboot+0x1d2/0x210
[52626.093815] do_syscall_64+0x5b/0x1a0
[52626.097483] entry_SYSCALL_64_after_hwframe+0x65/0xca
Fixes: 974578017fc1 ("iavf: Add waiting so the port is initialized in remove")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
drivers/net/ethernet/intel/iavf/iavf_main.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 45570e3f782e..0e178a0a59c5 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4620,6 +4620,13 @@ static void iavf_remove(struct pci_dev *pdev)
struct iavf_hw *hw = &adapter->hw;
int err;
+ /* When reboot/shutdown is in progress no need to do anything
+ * as the adapter is already REMOVE state that was set during
+ * iavf_shutdown() callback.
+ */
+ if (adapter->state == __IAVF_REMOVE)
+ return;
+
set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
/* Wait until port initialization is complete.
* There are flows where register/unregister netdev may race.
--
2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: Ivan Vecera <ivecera@redhat.com>
To: intel-wired-lan@osuosl.org
Subject: [Intel-wired-lan] [PATCH] iavf: Fix hang during reboot/shutdown
Date: Thu, 17 Mar 2022 11:45:24 +0100 [thread overview]
Message-ID: <20220317104524.2802848-1-ivecera@redhat.com> (raw)
Recent commit 974578017fc1 ("iavf: Add waiting so the port is
initialized in remove") adds a wait-loop at the beginning of
iavf_remove() to ensure that port initialization is finished
prior unregistering net device. This causes a regression
in reboot/shutdown scenario because in this case callback
iavf_shutdown() is called and this callback detaches the device,
makes it down if it is running and sets its state to __IAVF_REMOVE.
Later shutdown callback of associated PF driver (e.g. ice_shutdown)
is called. That callback calls among other things sriov_disable()
that calls indirectly iavf_remove() (see stack trace below).
As the adapter state is already __IAVF_REMOVE then the mentioned
loop is end-less and shutdown process hangs.
The patch fixes this by checking adapter's state at the beginning
of iavf_remove() and skips the rest of the function if the adapter
is already in remove state (shutdown is in progress).
Reproducer:
1. Create VF on PF driven by ice or i40e driver
2. Ensure that the VF is bound to iavf driver
3. Reboot
[52625.981294] sysrq: SysRq : Show Blocked State
[52625.988377] task:reboot state:D stack: 0 pid:17359 ppid: 1 f2
[52625.996732] Call Trace:
[52625.999187] __schedule+0x2d1/0x830
[52626.007400] schedule+0x35/0xa0
[52626.010545] schedule_hrtimeout_range_clock+0x83/0x100
[52626.020046] usleep_range+0x5b/0x80
[52626.023540] iavf_remove+0x63/0x5b0 [iavf]
[52626.027645] pci_device_remove+0x3b/0xc0
[52626.031572] device_release_driver_internal+0x103/0x1f0
[52626.036805] pci_stop_bus_device+0x72/0xa0
[52626.040904] pci_stop_and_remove_bus_device+0xe/0x20
[52626.045870] pci_iov_remove_virtfn+0xba/0x120
[52626.050232] sriov_disable+0x2f/0xe0
[52626.053813] ice_free_vfs+0x7c/0x340 [ice]
[52626.057946] ice_remove+0x220/0x240 [ice]
[52626.061967] ice_shutdown+0x16/0x50 [ice]
[52626.065987] pci_device_shutdown+0x34/0x60
[52626.070086] device_shutdown+0x165/0x1c5
[52626.074011] kernel_restart+0xe/0x30
[52626.077593] __do_sys_reboot+0x1d2/0x210
[52626.093815] do_syscall_64+0x5b/0x1a0
[52626.097483] entry_SYSCALL_64_after_hwframe+0x65/0xca
Fixes: 974578017fc1 ("iavf: Add waiting so the port is initialized in remove")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
drivers/net/ethernet/intel/iavf/iavf_main.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 45570e3f782e..0e178a0a59c5 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4620,6 +4620,13 @@ static void iavf_remove(struct pci_dev *pdev)
struct iavf_hw *hw = &adapter->hw;
int err;
+ /* When reboot/shutdown is in progress no need to do anything
+ * as the adapter is already REMOVE state that was set during
+ * iavf_shutdown() callback.
+ */
+ if (adapter->state == __IAVF_REMOVE)
+ return;
+
set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
/* Wait until port initialization is complete.
* There are flows where register/unregister netdev may race.
--
2.34.1
next reply other threads:[~2022-03-17 10:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-17 10:45 Ivan Vecera [this message]
2022-03-17 10:45 ` [Intel-wired-lan] [PATCH] iavf: Fix hang during reboot/shutdown Ivan Vecera
2022-03-17 16:11 ` Jakub Kicinski
2022-03-17 16:11 ` [Intel-wired-lan] " Jakub Kicinski
2022-03-17 17:03 ` Tony Nguyen
2022-03-17 17:03 ` [Intel-wired-lan] " Tony Nguyen
2022-03-17 17:18 ` Jakub Kicinski
2022-03-17 17:30 ` patchwork-bot+netdevbpf
2022-03-17 17:30 ` [Intel-wired-lan] " patchwork-bot+netdevbpf
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