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SubjectRe: [REGRESSION][3.8.-rc1][ INFO: possible circular locking dependency detected ]
On Sat, 22 Dec 2012 at 16:28, Maciej Rutecki wrote:
> Got during suspend to disk:

I got a similar message on a powerpc G4 system, right after bootup (no
suspend involved):

http://nerdbynature.de/bits/3.8.0-rc1/

[ 97.803049] ======================================================
[ 97.803051] [ INFO: possible circular locking dependency detected ]
[ 97.803059] 3.8.0-rc1-dirty #2 Not tainted
[ 97.803060] -------------------------------------------------------
[ 97.803066] kworker/0:1/235 is trying to acquire lock:
[ 97.803097] ((fb_notifier_list).rwsem){.+.+.+}, at: [<c00606a0>] __blocking_notifier_call_chain+0x44/0x88
[ 97.803099]
[ 97.803099] but task is already holding lock:
[ 97.803110] (console_lock){+.+.+.}, at: [<c03b9fd0>] console_callback+0x20/0x194
[ 97.803112]
[ 97.803112] which lock already depends on the new lock.

...and on it goes. Please see the URL above for the whole dmesg and
.config.

@Li Zhong: I have applied your fix for the "MAX_STACK_TRACE_ENTRIES too
low" warning[0] to 3.8-rc1 (hence the -dirty flag), but in the
backtrace "ret_from_kernel_thread" shows up again. FWIW, your
patch helped to make the "MAX_STACK_TRACE_ENTRIES too low"
warning go away in 3.7.0-rc7 and it did not re-appear ever
since.

Thanks,
Christian.

[0] http://lkml.indiana.edu/hypermail/linux/kernel/1211.3/01917.html

> [ 269.784867] [ INFO: possible circular locking dependency detected ]
> [ 269.784869] 3.8.0-rc1 #1 Not tainted
> [ 269.784870] -------------------------------------------------------
> [ 269.784871] kworker/u:3/56 is trying to acquire lock:
> [ 269.784878] ((fb_notifier_list).rwsem){.+.+.+}, at: [<ffffffff81062a1d>]
> __blocking_notifier_call_chain+0x49/0x80
> [ 269.784879]
> [ 269.784879] but task is already holding lock:
> [ 269.784884] (console_lock){+.+.+.}, at: [<ffffffff812ee4ce>]
> i915_drm_freeze+0x9e/0xbb
> [ 269.784884]
> [ 269.784884] which lock already depends on the new lock.
> [ 269.784884]
> [ 269.784885]
> [ 269.784885] the existing dependency chain (in reverse order) is:
> [ 269.784887]
> [ 269.784887] -> #1 (console_lock){+.+.+.}:
> [ 269.784890] [<ffffffff810890e4>] lock_acquire+0x95/0x105
> [ 269.784893] [<ffffffff810405a1>] console_lock+0x59/0x5b
> [ 269.784897] [<ffffffff812ba125>] register_con_driver+0x36/0x128
> [ 269.784899] [<ffffffff812bb27e>] take_over_console+0x1e/0x45
> [ 269.784903] [<ffffffff81257a04>] fbcon_takeover+0x56/0x98
> [ 269.784906] [<ffffffff8125b857>] fbcon_event_notify+0x2c1/0x5ea
> [ 269.784909] [<ffffffff8149a211>] notifier_call_chain+0x67/0x92
> [ 269.784911] [<ffffffff81062a33>] __blocking_notifier_call_chain+0x5f/0x80
> [ 269.784912] [<ffffffff81062a63>] blocking_notifier_call_chain+0xf/0x11
> [ 269.784915] [<ffffffff8124e85e>] fb_notifier_call_chain+0x16/0x18
> [ 269.784917] [<ffffffff812505d7>] register_framebuffer+0x20a/0x26e
> [ 269.784920] [<ffffffff812d3ca0>]
> drm_fb_helper_single_fb_probe+0x1ce/0x297
> [ 269.784922] [<ffffffff812d3f40>] drm_fb_helper_initial_config+0x1d7/0x1ef
> [ 269.784924] [<ffffffff8132cee2>] intel_fbdev_init+0x6f/0x82
> [ 269.784927] [<ffffffff812f22f6>] i915_driver_load+0xa9e/0xc78
> [ 269.784929] [<ffffffff812e020c>] drm_get_pci_dev+0x165/0x26d
> [ 269.784931] [<ffffffff812ee8da>] i915_pci_probe+0x60/0x69
> [ 269.784933] [<ffffffff8123fe8e>] local_pci_probe+0x39/0x61
> [ 269.784935] [<ffffffff812400f5>] pci_device_probe+0xba/0xe0
> [ 269.784938] [<ffffffff8133d3b6>] driver_probe_device+0x99/0x1c4
> [ 269.784940] [<ffffffff8133d52f>] __driver_attach+0x4e/0x6f
> [ 269.784942] [<ffffffff8133bae1>] bus_for_each_dev+0x52/0x84
> [ 269.784944] [<ffffffff8133cec6>] driver_attach+0x19/0x1b
> [ 269.784946] [<ffffffff8133cb65>] bus_add_driver+0xdf/0x203
> [ 269.784948] [<ffffffff8133dad3>] driver_register+0x8e/0x114
> [ 269.784952] [<ffffffff8123f581>] __pci_register_driver+0x5d/0x62
> [ 269.784953] [<ffffffff812e0395>] drm_pci_init+0x81/0xe6
> [ 269.784957] [<ffffffff81af7612>] i915_init+0x66/0x68
> [ 269.784959] [<ffffffff810020b4>] do_one_initcall+0x7a/0x136
> [ 269.784962] [<ffffffff8147ceaa>] kernel_init+0x141/0x296
> [ 269.784964] [<ffffffff8149c7bc>] ret_from_fork+0x7c/0xb0
> [ 269.784966]
> [ 269.784966] -> #0 ((fb_notifier_list).rwsem){.+.+.+}:
> [ 269.784967] [<ffffffff81088955>] __lock_acquire+0xa7e/0xddd
> [ 269.784969] [<ffffffff810890e4>] lock_acquire+0x95/0x105
> [ 269.784971] [<ffffffff81495092>] down_read+0x34/0x43
> [ 269.784973] [<ffffffff81062a1d>] __blocking_notifier_call_chain+0x49/0x80
> [ 269.784975] [<ffffffff81062a63>] blocking_notifier_call_chain+0xf/0x11
> [ 269.784977] [<ffffffff8124e85e>] fb_notifier_call_chain+0x16/0x18
> [ 269.784979] [<ffffffff8124ec47>] fb_set_suspend+0x22/0x4d
> [ 269.784981] [<ffffffff8132cfe3>] intel_fbdev_set_suspend+0x20/0x22
> [ 269.784983] [<ffffffff812ee4db>] i915_drm_freeze+0xab/0xbb
> [ 269.784985] [<ffffffff812eea82>] i915_pm_freeze+0x3d/0x41
> [ 269.784987] [<ffffffff8123f759>] pci_pm_freeze+0x65/0x8d
> [ 269.784990] [<ffffffff81342f20>] dpm_run_callback.isra.3+0x27/0x56
> [ 269.784993] [<ffffffff81343085>] __device_suspend+0x136/0x1b1
> [ 269.784995] [<ffffffff8134311a>] async_suspend+0x1a/0x58
> [ 269.784997] [<ffffffff81063a6b>] async_run_entry_fn+0xa4/0x17c
> [ 269.785000] [<ffffffff81058df2>] process_one_work+0x1cf/0x38e
> [ 269.785002] [<ffffffff81059290>] worker_thread+0x12e/0x1cc
> [ 269.785004] [<ffffffff8105d416>] kthread+0xac/0xb4
> [ 269.785006] [<ffffffff8149c7bc>] ret_from_fork+0x7c/0xb0
> [ 269.785006]
> [ 269.785006] other info that might help us debug this:
> [ 269.785006]
> [ 269.785007] Possible unsafe locking scenario:
> [ 269.785007]
> [ 269.785008] CPU0 CPU1
> [ 269.785008] ---- ----
> [ 269.785009] lock(console_lock);
> [ 269.785010] lock((fb_notifier_list).rwsem);
> [ 269.785012] lock(console_lock);
> [ 269.785013] lock((fb_notifier_list).rwsem);
> [ 269.785013]
> [ 269.785013] *** DEADLOCK ***
> [ 269.785013]
> [ 269.785014] 4 locks held by kworker/u:3/56:
> [ 269.785018] #0: (events_unbound){.+.+.+}, at: [<ffffffff81058d77>]
> process_one_work+0x154/0x38e
> [ 269.785021] #1: ((&entry->work)){+.+.+.}, at: [<ffffffff81058d77>]
> process_one_work+0x154/0x38e
> [ 269.785024] #2: (&__lockdep_no_validate__){......}, at: [<ffffffff81342d85>]
> device_lock+0xf/0x11
> [ 269.785027] #3: (console_lock){+.+.+.}, at: [<ffffffff812ee4ce>]
> i915_drm_freeze+0x9e/0xbb
> [ 269.785028]
> [ 269.785028] stack backtrace:
> [ 269.785029] Pid: 56, comm: kworker/u:3 Not tainted 3.8.0-rc1 #1
> [ 269.785030] Call Trace:
> [ 269.785035] [<ffffffff8148fcb5>] print_circular_bug+0x1f8/0x209
> [ 269.785036] [<ffffffff81088955>] __lock_acquire+0xa7e/0xddd
> [ 269.785038] [<ffffffff810890e4>] lock_acquire+0x95/0x105
> [ 269.785040] [<ffffffff81062a1d>] ? __blocking_notifier_call_chain+0x49/0x80
> [ 269.785042] [<ffffffff81495092>] down_read+0x34/0x43
> [ 269.785044] [<ffffffff81062a1d>] ? __blocking_notifier_call_chain+0x49/0x80
> [ 269.785046] [<ffffffff81062a1d>] __blocking_notifier_call_chain+0x49/0x80
> [ 269.785047] [<ffffffff81062a63>] blocking_notifier_call_chain+0xf/0x11
> [ 269.785050] [<ffffffff8124e85e>] fb_notifier_call_chain+0x16/0x18
> [ 269.785052] [<ffffffff8124ec47>] fb_set_suspend+0x22/0x4d
> [ 269.785054] [<ffffffff8132cfe3>] intel_fbdev_set_suspend+0x20/0x22
> [ 269.785055] [<ffffffff812ee4db>] i915_drm_freeze+0xab/0xbb
> [ 269.785057] [<ffffffff812eea82>] i915_pm_freeze+0x3d/0x41
> [ 269.785060] [<ffffffff8123f759>] pci_pm_freeze+0x65/0x8d
> [ 269.785062] [<ffffffff8123f6f4>] ? pci_pm_poweroff+0x9c/0x9c
> [ 269.785064] [<ffffffff81342f20>] dpm_run_callback.isra.3+0x27/0x56
> [ 269.785066] [<ffffffff81343085>] __device_suspend+0x136/0x1b1
> [ 269.785068] [<ffffffff81089563>] ? trace_hardirqs_on_caller+0x117/0x173
> [ 269.785070] [<ffffffff8134311a>] async_suspend+0x1a/0x58
> [ 269.785072] [<ffffffff81063a6b>] async_run_entry_fn+0xa4/0x17c
> [ 269.785074] [<ffffffff81058df2>] process_one_work+0x1cf/0x38e
> [ 269.785076] [<ffffffff81058d77>] ? process_one_work+0x154/0x38e
> [ 269.785078] [<ffffffff810639c7>] ? async_schedule+0x12/0x12
> [ 269.785080] [<ffffffff8105679f>] ? spin_lock_irq+0x9/0xb
> [ 269.785082] [<ffffffff81059290>] worker_thread+0x12e/0x1cc
> [ 269.785084] [<ffffffff81059162>] ? rescuer_thread+0x187/0x187
> [ 269.785085] [<ffffffff8105d416>] kthread+0xac/0xb4
> [ 269.785088] [<ffffffff8105d36a>] ? __kthread_parkme+0x60/0x60
> [ 269.785090] [<ffffffff8149c7bc>] ret_from_fork+0x7c/0xb0
> [ 269.785091] [<ffffffff8105d36a>] ? __kthread_parkme+0x60/0x60
>
>
> Config:
> http://mrutecki.pl/download/kernel/3.8.0-rc1/s2disk/config-3.8.0-rc1
>
> dmesg:
> http://mrutecki.pl/download/kernel/3.8.0-rc1/s2disk/dmesg-3.8.0-rc1.txt
>
>
> Found similar report:
> http://marc.info/?l=linux-kernel&m=135546308908700&w=2
>
> Regards
>
> --
> Maciej Rutecki
> http://www.mrutecki.pl
> --
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