During suspend-to-RAM, I see an info message below. Could anybody
advice how to debug this problem or anyone has experienced this
before? (ARM mach)
Thanks a lot for any help.
[ 172.637547] ======================================================
[ 172.637555] [ INFO: possible circular locking dependency detected ]
[ 172.637565] 3.10.5+ #1 Not tainted
[ 172.637573] -------------------------------------------------------
[ 172.637581] kworker/u12:0/6 is trying to acquire lock:
[ 172.637628] (cpu_add_remove_lock){+.+.+.}, at: [<c002973c>]
cpu_maps_update_begin+0x20/0x28
[ 172.637635]
[ 172.637635] but task is already holding lock:
[ 172.637671] (console_lock){+.+.+.}, at: [<c0028974>]
suspend_console+0x30/0x54
[ 172.637679]
[ 172.637679] which lock already depends on the new lock.
[ 172.637679]
[ 172.637686]
[ 172.637686] the existing dependency chain (in reverse order) is:
[ 172.637714]
[ 172.637714] -> #2 (console_lock){+.+.+.}:
[ 172.637734] [<c008d880>] check_prevs_add+0x704/0x874
[ 172.637752] [<c008dfd0>] validate_chain.isra.24+0x5e0/0x9b0
[ 172.637769] [<c00909f0>] __lock_acquire+0x3fc/0xbcc
[ 172.637786] [<c009186c>] lock_acquire+0xa4/0x208
[ 172.637804] [<c002656c>] console_lock+0x70/0x88
[ 172.637824] [<c075f950>] console_cpu_notify+0x28/0x34
[ 172.637844] [<c07733f8>] notifier_call_chain+0x74/0x138
[ 172.637864] [<c0057374>] __raw_notifier_call_chain+0x24/0x2c
[ 172.637880] [<c002953c>] __cpu_notify+0x38/0x54
[ 172.637896] [<c0029578>] cpu_notify+0x20/0x24
[ 172.637913] [<c0029710>] cpu_notify_nofail+0x18/0x24
[ 172.637929] [<c075d9f0>] _cpu_down+0x108/0x2b8
[ 172.637946] [<c075dbd4>] cpu_down+0x34/0x50
[ 172.637962] [<c075e4f4>] store_online+0x40/0x84
[ 172.637981] [<c034e430>] dev_attr_store+0x28/0x34
[ 172.638000] [<c019c4a0>] sysfs_write_file+0x17c/0x1ac
[ 172.638018] [<c01318b4>] vfs_write+0xc0/0x19c
[ 172.638034] [<c0131cb0>] SyS_write+0x4c/0x80
[ 172.638053] [<c000efa0>] ret_fast_syscall+0x0/0x48
[ 172.638081]
[ 172.638081] -> #1 (cpu_hotplug.lock){+.+.+.}:
[ 172.638098] [<c008d880>] check_prevs_add+0x704/0x874
[ 172.638116] [<c008dfd0>] validate_chain.isra.24+0x5e0/0x9b0
[ 172.638132] [<c00909f0>] __lock_acquire+0x3fc/0xbcc
[ 172.638149] [<c009186c>] lock_acquire+0xa4/0x208
[ 172.638166] [<c076dc78>] mutex_lock_nested+0x74/0x3f8
[ 172.638183] [<c00295b8>] cpu_hotplug_begin+0x3c/0x68
[ 172.638200] [<c075f988>] _cpu_up+0x2c/0x15c
[ 172.638216] [<c075fb24>] cpu_up+0x6c/0x8c
[ 172.638236] [<c0a90774>] smp_init+0x9c/0xd4
[ 172.638254] [<c0a8293c>] kernel_init_freeable+0x78/0x1cc
[ 172.638270] [<c075d694>] kernel_init+0x18/0xf4
[ 172.638288] [<c000f068>] ret_from_fork+0x14/0x20
[ 172.638316]
[ 172.638316] -> #0 (cpu_add_remove_lock){+.+.+.}:
[ 172.638335] [<c0763aa0>] print_circular_bug+0x70/0x2e4
[ 172.638352] [<c008d9c0>] check_prevs_add+0x844/0x874
[ 172.638370] [<c008dfd0>] validate_chain.isra.24+0x5e0/0x9b0
[ 172.638387] [<c00909f0>] __lock_acquire+0x3fc/0xbcc
[ 172.638404] [<c009186c>] lock_acquire+0xa4/0x208
[ 172.638421] [<c076dc78>] mutex_lock_nested+0x74/0x3f8
[ 172.638438] [<c002973c>] cpu_maps_update_begin+0x20/0x28
[ 172.638455] [<c0029a24>] disable_nonboot_cpus+0x20/0xf4
[ 172.638476] [<c007df64>] suspend_devices_and_enter+0x1b0/0x574
[ 172.638494] [<c007e4f8>] pm_suspend+0x1d0/0x288
[ 172.638512] [<c007e6b0>] try_to_suspend+0xc0/0xdc
[ 172.638530] [<c0047e44>] process_one_work+0x1c8/0x684
[ 172.638547] [<c0048738>] worker_thread+0x144/0x394
[ 172.638565] [<c00508a4>] kthread+0xb4/0xc0
[ 172.638582] [<c000f068>] ret_from_fork+0x14/0x20
[ 172.638590]
[ 172.638590] other info that might help us debug this:
[ 172.638590]
[ 172.638630] Chain exists of:
[ 172.638630] cpu_add_remove_lock --> cpu_hotplug.lock --> console_lock
[ 172.638630]
[ 172.638637] Possible unsafe locking scenario:
[ 172.638637]
[ 172.638644] CPU0 CPU1
[ 172.638651] ---- ----
[ 172.638668] lock(console_lock);
[ 172.638685] lock(cpu_hotplug.lock);
[ 172.638703] lock(console_lock);
[ 172.638720] lock(cpu_add_remove_lock);
[ 172.638726]
[ 172.638726] *** DEADLOCK ***
[ 172.638726]
[ 172.638735] 5 locks held by kworker/u12:0/6:
[ 172.638774] #0: (autosleep){.+.+.+}, at: [<c0047db4>]
process_one_work+0x138/0x684
[ 172.638813] #1: (suspend_work){+.+.+.}, at: [<c0047db4>]
process_one_work+0x138/0x684
[ 172.638853] #2: (autosleep_lock){+.+.+.}, at: [<c007e628>]
try_to_suspend+0x38/0xdc
[ 172.638893] #3: (pm_mutex){+.+.+.}, at: [<c007e36c>] pm_suspend+0x44/0x288
[ 172.638933] #4: (console_lock){+.+.+.}, at: [<c0028974>]
suspend_console+0x30/0x54
[ 172.638939]
[ 172.638939] stack backtrace:
[ 172.638952] CPU: 0 PID: 6 Comm: kworker/u12:0 Not tainted 3.10.5+ #1
[ 172.638973] Workqueue: autosleep try_to_suspend
[ 172.638997] [<c0016658>] (unwind_backtrace+0x0/0x144) from
[<c00134ec>] (show_stack+0x20/0x24)
[ 172.639017] [<c00134ec>] (show_stack+0x20/0x24) from [<c0768c38>]
(dump_stack+0x20/0x28)
[ 172.639038] [<c0768c38>] (dump_stack+0x20/0x28) from [<c0763cc0>]
(print_circular_bug+0x290/0x2e4)
[ 172.639057] [<c0763cc0>] (print_circular_bug+0x290/0x2e4) from
[<c008d9c0>] (check_prevs_add+0x844/0x874)
[ 172.639075] [<c008d9c0>] (check_prevs_add+0x844/0x874) from
[<c008dfd0>] (validate_chain.isra.24+0x5e0/0x9b0)
[ 172.639093] [<c008dfd0>] (validate_chain.isra.24+0x5e0/0x9b0) from
[<c00909f0>] (__lock_acquire+0x3fc/0xbcc)
[ 172.639111] [<c00909f0>] (__lock_acquire+0x3fc/0xbcc) from
[<c009186c>] (lock_acquire+0xa4/0x208)
[ 172.639128] [<c009186c>] (lock_acquire+0xa4/0x208) from
[<c076dc78>] (mutex_lock_nested+0x74/0x3f8)
[ 172.639146] [<c076dc78>] (mutex_lock_nested+0x74/0x3f8) from
[<c002973c>] (cpu_maps_update_begin+0x20/0x28)
[ 172.639164] [<c002973c>] (cpu_maps_update_begin+0x20/0x28) from
[<c0029a24>] (disable_nonboot_cpus+0x20/0xf4)
[ 172.639184] [<c0029a24>] (disable_nonboot_cpus+0x20/0xf4) from
[<c007df64>] (suspend_devices_and_enter+0x1b0/0x574)
[ 172.639204] [<c007df64>] (suspend_devices_and_enter+0x1b0/0x574)
from [<c007e4f8>] (pm_suspend+0x1d0/0x288)
[ 172.639223] [<c007e4f8>] (pm_suspend+0x1d0/0x288) from [<c007e6b0>]
(try_to_suspend+0xc0/0xdc)
[ 172.639242] [<c007e6b0>] (try_to_suspend+0xc0/0xdc) from
[<c0047e44>] (process_one_work+0x1c8/0x684)
[ 172.639259] [<c0047e44>] (process_one_work+0x1c8/0x684) from
[<c0048738>] (worker_thread+0x144/0x394)
[ 172.639278] [<c0048738>] (worker_thread+0x144/0x394) from
[<c00508a4>] (kthread+0xb4/0xc0)
[ 172.639296] [<c00508a4>] (kthread+0xb4/0xc0) from [<c000f068>]
(ret_from_fork+0x14/0x20)
[ 172.639307] Disabling non-boot CPUs ...
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