linux-kernel - Re: INFO: task systemd-udevd:94 blocked for more than 120 seconds.

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Message-ID: <Yy4GoMMwiBaq3oJf@dev-arch.thelio-3990X>
Date:   Fri, 23 Sep 2022 12:18:56 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: INFO: task systemd-udevd:94 blocked for more than 120 seconds.

On Fri, Sep 23, 2022 at 08:59:07PM +0200, Borislav Petkov wrote:
> Hi folks,
> 
> I'm seeing the below on linux-next-20220923 and thermal_zone is in the
> stacktrace so I thought I should Cc relevant folks in case you have an
> idea...
> 
> [  155.065997] radeon 0000:00:01.0: [drm] fb0: radeondrmfb frame buffer device
> [  155.152551] [drm] Initialized radeon 2.50.0 20080528 for 0000:00:01.0 on minor 0
> [  242.946675] INFO: task systemd-udevd:94 blocked for more than 120 seconds.
> [  242.946820]       Not tainted 6.0.0-rc6-next-20220923 #1
> [  242.946902] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [  242.946995] task:systemd-udevd   state:D stack:13344 pid:94    ppid:88     flags:0x00004004
> [  242.947118] Call Trace:
> [  242.947166]  <TASK>
> [  242.947216]  __schedule+0x2af/0x830
> [  242.947297]  schedule+0x5d/0xc0
> [  242.947360]  schedule_preempt_disabled+0x14/0x30
> [  242.947442]  __mutex_lock.constprop.0+0x2d0/0x7b0
> [  242.947524]  thermal_zone_device_update.part.0+0xf8/0x2f0
> [  242.947607]  ? acpi_system_write_wakeup_device+0x170/0x170
> [  242.947700]  thermal_zone_device_set_mode+0x75/0xb0
> [  242.947781]  acpi_thermal_add+0x3c2/0x400 [thermal]
> [  242.947881]  acpi_device_probe+0x56/0x110
> [  242.947953]  really_probe+0xc7/0x280
> [  242.948022]  ? pm_runtime_barrier+0x61/0xb0
> [  242.948098]  __driver_probe_device+0x71/0xd0
> [  242.948175]  driver_probe_device+0x2d/0x100
> [  242.948245]  __driver_attach+0xa6/0x1a0
> [  242.950659]  ? __device_attach_driver+0x110/0x110
> [  242.953030]  bus_for_each_dev+0x69/0xa0
> [  242.955433]  bus_add_driver+0x1b0/0x200
> [  242.957806]  ? _raw_spin_unlock+0x12/0x40
> [  242.959211]  driver_register+0x89/0xe0
> [  242.960589]  ? 0xffffffffa0006000
> [  242.961957]  acpi_thermal_init+0x5c/0x1000 [thermal]
> [  242.963375]  do_one_initcall+0x4d/0x210
> [  242.964756]  ? kmalloc_trace+0x38/0xc0
> [  242.966130]  do_init_module+0x4a/0x1e0
> [  242.967503]  __do_sys_finit_module+0xa7/0x100
> [  242.968858]  do_syscall_64+0x42/0x90
> [  242.970202]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> [  242.971561] RIP: 0033:0x7fd31c8189b9
> [  242.972910] RSP: 002b:00007ffd203a81b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [  242.974318] RAX: ffffffffffffffda RBX: 00005571cdddfb30 RCX: 00007fd31c8189b9
> [  242.975720] RDX: 0000000000000000 RSI: 00007fd31c9a3e2d RDI: 0000000000000005
> [  242.977089] RBP: 0000000000020000 R08: 0000000000000000 R09: 00005571cddc6f50
> [  242.978449] R10: 0000000000000005 R11: 0000000000000246 R12: 00007fd31c9a3e2d
> [  242.979792] R13: 0000000000000000 R14: 00005571cddd8170 R15: 00005571cdddfb30
> [  242.981143]  </TASK>

I have not seen a stacktrace like this on my machines (although I
suspect that is because I don't have CONFIG_DETECT_HUNG_TASK enabled in
my configs) but my Honeycomb LX2 hangs while booting after commit
78ffa3e58d93 ("thermal/core: Add a generic thermal_zone_get_trip()
function") according to my bisect, which certainly seems like it could
be related to the trace you are seeing.

Cheers,
Nathan