From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Guenter Roeck <linux@roeck-us.net>,
Alexander Sverdlin <alexander.sverdlin@nokia.com>,
Krzysztof Sobota <krzysztof.sobota@nokia.com>,
Wim Van Sebroeck <wim@linux-watchdog.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 72/92] watchdog: initialize device before misc_register
Date: Thu, 20 Aug 2020 11:21:57 +0200 [thread overview]
Message-ID: <20200820091541.413970193@linuxfoundation.org> (raw)
In-Reply-To: <20200820091537.490965042@linuxfoundation.org>
From: Krzysztof Sobota <krzysztof.sobota@nokia.com>
[ Upstream commit cb36e29bb0e4b0c33c3d5866a0a4aebace4c99b7 ]
When watchdog device is being registered, it calls misc_register that
makes watchdog available for systemd to open. This is a data race
scenario, because when device is open it may still have device struct
not initialized - this in turn causes a crash. This patch moves
device initialization before misc_register call and it solves the
problem printed below.
------------[ cut here ]------------
WARNING: CPU: 3 PID: 1 at lib/kobject.c:612 kobject_get+0x50/0x54
kobject: '(null)' ((ptrval)): is not initialized, yet kobject_get() is being called.
Modules linked in: k2_reset_status(O) davinci_wdt(+) sfn_platform_hwbcn(O) fsmddg_sfn(O) clk_misc_mmap(O) clk_sw_bcn(O) fsp_reset(O) cma_mod(O) slave_sup_notif(O) fpga_master(O) latency(O+) evnotify(O) enable_arm_pmu(O) xge(O) rio_mport_cdev br_netfilter bridge stp llc nvrd_checksum(O) ipv6
CPU: 3 PID: 1 Comm: systemd Tainted: G O 4.19.113-g2579778-fsm4_k2 #1
Hardware name: Keystone
[<c02126c4>] (unwind_backtrace) from [<c020da94>] (show_stack+0x18/0x1c)
[<c020da94>] (show_stack) from [<c07f87d8>] (dump_stack+0xb4/0xe8)
[<c07f87d8>] (dump_stack) from [<c0221f70>] (__warn+0xfc/0x114)
[<c0221f70>] (__warn) from [<c0221fd8>] (warn_slowpath_fmt+0x50/0x74)
[<c0221fd8>] (warn_slowpath_fmt) from [<c07fd394>] (kobject_get+0x50/0x54)
[<c07fd394>] (kobject_get) from [<c0602ce8>] (get_device+0x1c/0x24)
[<c0602ce8>] (get_device) from [<c06961e0>] (watchdog_open+0x90/0xf0)
[<c06961e0>] (watchdog_open) from [<c06001dc>] (misc_open+0x130/0x17c)
[<c06001dc>] (misc_open) from [<c0388228>] (chrdev_open+0xec/0x1a8)
[<c0388228>] (chrdev_open) from [<c037fa98>] (do_dentry_open+0x204/0x3cc)
[<c037fa98>] (do_dentry_open) from [<c0391e2c>] (path_openat+0x330/0x1148)
[<c0391e2c>] (path_openat) from [<c0394518>] (do_filp_open+0x78/0xec)
[<c0394518>] (do_filp_open) from [<c0381100>] (do_sys_open+0x130/0x1f4)
[<c0381100>] (do_sys_open) from [<c0201000>] (ret_fast_syscall+0x0/0x28)
Exception stack(0xd2ceffa8 to 0xd2cefff0)
ffa0: b6f69968 00000000 ffffff9c b6ebd210 000a0001 00000000
ffc0: b6f69968 00000000 00000000 00000142 fffffffd ffffffff 00b65530 bed7bb78
ffe0: 00000142 bed7ba70 b6cc2503 b6cc41d6
---[ end trace 7b16eb105513974f ]---
------------[ cut here ]------------
WARNING: CPU: 3 PID: 1 at lib/refcount.c:153 kobject_get+0x24/0x54
refcount_t: increment on 0; use-after-free.
Modules linked in: k2_reset_status(O) davinci_wdt(+) sfn_platform_hwbcn(O) fsmddg_sfn(O) clk_misc_mmap(O) clk_sw_bcn(O) fsp_reset(O) cma_mod(O) slave_sup_notif(O) fpga_master(O) latency(O+) evnotify(O) enable_arm_pmu(O) xge(O) rio_mport_cdev br_netfilter bridge stp llc nvrd_checksum(O) ipv6
CPU: 3 PID: 1 Comm: systemd Tainted: G W O 4.19.113-g2579778-fsm4_k2 #1
Hardware name: Keystone
[<c02126c4>] (unwind_backtrace) from [<c020da94>] (show_stack+0x18/0x1c)
[<c020da94>] (show_stack) from [<c07f87d8>] (dump_stack+0xb4/0xe8)
[<c07f87d8>] (dump_stack) from [<c0221f70>] (__warn+0xfc/0x114)
[<c0221f70>] (__warn) from [<c0221fd8>] (warn_slowpath_fmt+0x50/0x74)
[<c0221fd8>] (warn_slowpath_fmt) from [<c07fd368>] (kobject_get+0x24/0x54)
[<c07fd368>] (kobject_get) from [<c0602ce8>] (get_device+0x1c/0x24)
[<c0602ce8>] (get_device) from [<c06961e0>] (watchdog_open+0x90/0xf0)
[<c06961e0>] (watchdog_open) from [<c06001dc>] (misc_open+0x130/0x17c)
[<c06001dc>] (misc_open) from [<c0388228>] (chrdev_open+0xec/0x1a8)
[<c0388228>] (chrdev_open) from [<c037fa98>] (do_dentry_open+0x204/0x3cc)
[<c037fa98>] (do_dentry_open) from [<c0391e2c>] (path_openat+0x330/0x1148)
[<c0391e2c>] (path_openat) from [<c0394518>] (do_filp_open+0x78/0xec)
[<c0394518>] (do_filp_open) from [<c0381100>] (do_sys_open+0x130/0x1f4)
[<c0381100>] (do_sys_open) from [<c0201000>] (ret_fast_syscall+0x0/0x28)
Exception stack(0xd2ceffa8 to 0xd2cefff0)
ffa0: b6f69968 00000000 ffffff9c b6ebd210 000a0001 00000000
ffc0: b6f69968 00000000 00000000 00000142 fffffffd ffffffff 00b65530 bed7bb78
ffe0: 00000142 bed7ba70 b6cc2503 b6cc41d6
---[ end trace 7b16eb1055139750 ]---
Fixes: 72139dfa2464 ("watchdog: Fix the race between the release of watchdog_core_data and cdev")
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Krzysztof Sobota <krzysztof.sobota@nokia.com>
Link: https://lore.kernel.org/r/20200717103109.14660-1-krzysztof.sobota@nokia.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/watchdog/watchdog_dev.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 10b2090f3e5e7..1c322caecf7f1 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -947,6 +947,15 @@ static int watchdog_cdev_register(struct watchdog_device *wdd)
if (IS_ERR_OR_NULL(watchdog_kworker))
return -ENODEV;
+ device_initialize(&wd_data->dev);
+ wd_data->dev.devt = MKDEV(MAJOR(watchdog_devt), wdd->id);
+ wd_data->dev.class = &watchdog_class;
+ wd_data->dev.parent = wdd->parent;
+ wd_data->dev.groups = wdd->groups;
+ wd_data->dev.release = watchdog_core_data_release;
+ dev_set_drvdata(&wd_data->dev, wdd);
+ dev_set_name(&wd_data->dev, "watchdog%d", wdd->id);
+
kthread_init_work(&wd_data->work, watchdog_ping_work);
hrtimer_init(&wd_data->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
wd_data->timer.function = watchdog_timer_expired;
@@ -967,15 +976,6 @@ static int watchdog_cdev_register(struct watchdog_device *wdd)
}
}
- device_initialize(&wd_data->dev);
- wd_data->dev.devt = MKDEV(MAJOR(watchdog_devt), wdd->id);
- wd_data->dev.class = &watchdog_class;
- wd_data->dev.parent = wdd->parent;
- wd_data->dev.groups = wdd->groups;
- wd_data->dev.release = watchdog_core_data_release;
- dev_set_drvdata(&wd_data->dev, wdd);
- dev_set_name(&wd_data->dev, "watchdog%d", wdd->id);
-
/* Fill in the data structures */
cdev_init(&wd_data->cdev, &watchdog_fops);
--
2.25.1
next prev parent reply other threads:[~2020-08-20 9:55 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-20 9:20 [PATCH 4.19 00/92] 4.19.141-rc1 review Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 01/92] smb3: warn on confusing error scenario with sec=krb5 Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 02/92] genirq/affinity: Make affinity setting if activated opt-in Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 03/92] PCI: hotplug: ACPI: Fix context refcounting in acpiphp_grab_context() Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 04/92] PCI: Mark AMD Navi10 GPU rev 0x00 ATS as broken Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 05/92] PCI: Add device even if driver attach failed Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 06/92] PCI: qcom: Define some PARF params needed for ipq8064 SoC Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 07/92] PCI: qcom: Add support for tx term offset for rev 2.1.0 Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 08/92] PCI: Probe bridge window attributes once at enumeration-time Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 09/92] btrfs: free anon block device right after subvolume deletion Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 10/92] btrfs: dont allocate anonymous block device for user invisible roots Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 11/92] btrfs: ref-verify: fix memory leak in add_block_entry Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 12/92] btrfs: dont traverse into the seed devices in show_devname Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 13/92] btrfs: open device without device_list_mutex Greg Kroah-Hartman
2020-08-20 9:20 ` [PATCH 4.19 14/92] btrfs: fix messages after changing compression level by remount Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 15/92] btrfs: only search for left_info if there is no right_info in try_merge_free_space Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 16/92] btrfs: fix memory leaks after failure to lookup checksums during inode logging Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 17/92] btrfs: fix return value mixup in btrfs_get_extent Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 18/92] dt-bindings: iio: io-channel-mux: Fix compatible string in example code Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 19/92] iio: dac: ad5592r: fix unbalanced mutex unlocks in ad5592r_read_raw() Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 20/92] xtensa: fix xtensa_pmu_setup prototype Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 21/92] cifs: Fix leak when handling lease break for cached root fid Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 22/92] powerpc: Allow 4224 bytes of stack expansion for the signal frame Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 23/92] powerpc: Fix circular dependency between percpu.h and mmu.h Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 24/92] media: vsp1: dl: Fix NULL pointer dereference on unbind Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 25/92] net: ethernet: stmmac: Disable hardware multicast filter Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 26/92] net: stmmac: dwmac1000: provide multicast filter fallback Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 27/92] net/compat: Add missing sock updates for SCM_RIGHTS Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 28/92] md/raid5: Fix Force reconstruct-write io stuck in degraded raid5 Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 29/92] bcache: allocate meta data pages as compound pages Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 30/92] bcache: fix overflow in offset_to_stripe() Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 31/92] mac80211: fix misplaced while instead of if Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 32/92] driver core: Avoid binding drivers to dead devices Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 33/92] MIPS: CPU#0 is not hotpluggable Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 34/92] ext2: fix missing percpu_counter_inc Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 35/92] ocfs2: change slot number type s16 to u16 Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 36/92] mm/page_counter.c: fix protection usage propagation Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 37/92] ftrace: Setup correct FTRACE_FL_REGS flags for module Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 38/92] kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler Greg Kroah-Hartman
2020-09-28 20:02 ` Naresh Kamboju
2020-09-28 22:09 ` Steven Rostedt
2020-09-28 22:15 ` Steven Rostedt
2020-09-29 5:49 ` Masami Hiramatsu
2020-09-29 6:52 ` Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 39/92] tracing/hwlat: Honor the tracing_cpumask Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 40/92] tracing: Use trace_sched_process_free() instead of exit() for pid tracing Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 41/92] watchdog: f71808e_wdt: indicate WDIOF_CARDRESET support in watchdog_info.options Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 42/92] watchdog: f71808e_wdt: remove use of wrong watchdog_info option Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 43/92] watchdog: f71808e_wdt: clear watchdog timeout occurred flag Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 44/92] pseries: Fix 64 bit logical memory block panic Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 45/92] module: Correctly truncate sysfs sections output Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 46/92] perf intel-pt: Fix FUP packet state Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 47/92] remoteproc: qcom: q6v5: Update running state before requesting stop Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 48/92] drm/imx: imx-ldb: Disable both channels for split mode in enc->disable() Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 49/92] mfd: arizona: Ensure 32k clock is put on driver unbind and error Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 50/92] RDMA/ipoib: Return void from ipoib_ib_dev_stop() Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 51/92] RDMA/ipoib: Fix ABBA deadlock with ipoib_reap_ah() Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 52/92] media: rockchip: rga: Introduce color fmt macros and refactor CSC mode logic Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 53/92] media: rockchip: rga: Only set output CSC mode for RGB input Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 54/92] USB: serial: ftdi_sio: make process-packet buffer unsigned Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 55/92] USB: serial: ftdi_sio: clean up receive processing Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 56/92] USB: serial: ftdi_sio: fix break and sysrq handling Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 57/92] mmc: renesas_sdhi_internal_dmac: clean up the code for dma complete Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 58/92] gpu: ipu-v3: image-convert: Combine rotate/no-rotate irq handlers Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 59/92] dm rq: dont call blk_mq_queue_stopped() in dm_stop_queue() Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 60/92] selftests/powerpc: ptrace-pkey: Rename variables to make it easier to follow code Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 61/92] selftests/powerpc: ptrace-pkey: Update the test to mark an invalid pkey correctly Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 62/92] selftests/powerpc: ptrace-pkey: Dont update expected UAMOR value Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 63/92] iommu/omap: Check for failure of a call to omap_iommu_dump_ctx Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 64/92] iommu/vt-d: Enforce PASID devTLB field mask Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 65/92] i2c: rcar: slave: only send STOP event when we have been addressed Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 66/92] clk: clk-atlas6: fix return value check in atlas6_clk_init() Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 67/92] pwm: bcm-iproc: handle clk_get_rate() return Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 68/92] tools build feature: Use CC and CXX from parent Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 69/92] i2c: rcar: avoid race when unregistering slave Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 70/92] openrisc: Fix oops caused when dumping stack Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 71/92] scsi: lpfc: nvmet: Avoid hang / use-after-free again when destroying targetport Greg Kroah-Hartman
2020-08-20 9:21 ` Greg Kroah-Hartman [this message]
2020-08-20 9:21 ` [PATCH 4.19 73/92] Input: sentelic - fix error return when fsp_reg_write fails Greg Kroah-Hartman
2020-08-20 9:21 ` [PATCH 4.19 74/92] drm/vmwgfx: Use correct vmw_legacy_display_unit pointer Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 75/92] drm/vmwgfx: Fix two list_for_each loop exit tests Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 76/92] net: qcom/emac: add missed clk_disable_unprepare in error path of emac_clks_phase1_init Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 77/92] nfs: Fix getxattr kernel panic and memory overflow Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 78/92] fs/minix: set s_maxbytes correctly Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 79/92] fs/minix: fix block limit check for V1 filesystems Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 80/92] fs/minix: remove expected error message in block_to_path() Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 81/92] fs/ufs: avoid potential u32 multiplication overflow Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 82/92] test_kmod: avoid potential double free in trigger_config_run_type() Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 83/92] mfd: dln2: Run event handler loop under spinlock Greg Kroah-Hartman
2020-08-21 7:21 ` Pavel Machek
2020-08-21 9:06 ` Andy Shevchenko
2020-08-21 9:14 ` Greg Kroah-Hartman
2020-08-21 9:15 ` Greg Kroah-Hartman
2020-08-21 10:54 ` Andy Shevchenko
2020-08-21 11:21 ` Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 84/92] ALSA: echoaudio: Fix potential Oops in snd_echo_resume() Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 85/92] perf bench mem: Always memset source before memcpy Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 86/92] tools build feature: Quote CC and CXX for their arguments Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 87/92] sh: landisk: Add missing initialization of sh_io_port_base Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 88/92] khugepaged: retract_page_tables() remember to test exit Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 89/92] arm64: dts: marvell: espressobin: add ethernet alias Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 90/92] drm/radeon: fix fb_div check in ni_init_smc_spll_table() Greg Kroah-Hartman
2020-08-21 7:27 ` Pavel Machek
2020-08-21 7:37 ` Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 91/92] drm: Added orientation quirk for ASUS tablet model T103HAF Greg Kroah-Hartman
2020-08-20 9:22 ` [PATCH 4.19 92/92] drm/amdgpu: Fix bug where DPM is not enabled after hibernate and resume Greg Kroah-Hartman
2020-08-20 20:03 ` [PATCH 4.19 00/92] 4.19.141-rc1 review Guenter Roeck
2020-08-20 20:05 ` Guenter Roeck
2020-08-20 23:49 ` Shuah Khan
2020-08-21 7:09 ` Naresh Kamboju
2020-08-21 7:39 ` Pavel Machek
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