[ofa-general] possible irq lock inversion dependency detected

Bernd Schubert bs at q-leap.de
Tue May 15 02:48:50 PDT 2007


Hi,

with 2.6.20 I get this message:


[263206.999448] =========================================================
[263207.007607] [ INFO: possible irq lock inversion dependency detected ]
[263207.014153] 2.6.20.3-debug #9
[263207.017230] ---------------------------------------------------------
[263207.023775] ipoib/6662 just changed the state of lock:
[263207.029020]  (&idev->n_mcast_grps_lock){-...}, at: [_end+122750808/2124917936] ipath_multicast_detach+0x211/0x231 [ib_ipath]
[263207.039866] but this lock was taken by another, hard-irq-safe lock in the past:
[263207.047294]  (mcast_lock){++..}
[263207.050380] 
[263207.050381] and interrupts could create inverse lock ordering between them.
[263207.050382] 
[263207.060846] 
[263207.060847] other info that might help us debug this:
[263207.067609] 1 lock held by ipoib/6662:
[263207.071468]  #0:  (&priv->mcast_mutex){--..}, at: [mutex_lock+35/39] mutex_lock+0x23/0x27
[263207.080061] 
[263207.080062] the first lock's dependencies:
[263207.085862] -> (&idev->n_mcast_grps_lock){-...} ops: 3 {
[263207.091371]    initial-use  at:
[263207.094647] 					[mark_lock+135/1127] mark_lock+0x87/0x467
[263207.104352] 					[__lock_acquire+1476/3168] __lock_acquire+0x5c4/0xc60
[263207.114571] 					[_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263207.126446] 					[lock_acquire+124/160] lock_acquire+0x7c/0xa0
[263207.136317] 					[_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263207.148192] 					[_spin_lock+34/46] _spin_lock+0x22/0x2e
[263207.157891] 					[_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263207.169766] 					[_end+122587907/2124917936] ib_attach_mcast+0x2f/0x31 [ib_core]
[263207.187046] 					[_end+123887919/2124917936] ipoib_mcast_attach+0xe3/0x123 [ib_ipoib]
[263207.198481] 					[_end+123880632/2124917936] ipoib_mcast_join_finish+0x125/0x3fa [ib_ipoib]
[263207.210441] 					[check_usage+53/661] check_usage+0x35/0x295
[263207.220328] 					[lock_timer_base+35/72] lock_timer_base+0x23/0x48
[263207.230454] 					[__lock_acquire+3080/3168] __lock_acquire+0xc08/0xc60
[263207.240674] 					[_end+123881884/2124917936] ipoib_mcast_join_complete+0xcb/0x31a [ib_ipoib]
[263207.252720] 					[_read_unlock_irqrestore+56/71] _read_unlock_irqrestore+0x38/0x47
[263207.263544] 					[_end+122585085/2124917936] ib_unpack+0xad/0x11c [ib_core]
[263207.274117] 					[_end+123844451/2124917936] ib_sa_mcmember_rec_callback+0x4c/0x57 [ib_sa]
[263207.285983] 					[_end+123844738/2124917936] recv_handler+0x3f/0x4b [ib_sa]
[263207.296547] 					[_end+123718406/2124917936] ib_mad_completion_handler+0x3c7/0x59b [ib_mad]
[263207.308511] 					[run_workqueue+134/380] run_workqueue+0x86/0x17c
[263207.318552] 					[_end+123717439/2124917936] ib_mad_completion_handler+0x0/0x59b [ib_mad]
[263207.330333] 					[run_workqueue+177/380] run_workqueue+0xb1/0x17c
[263207.340377] 					[worker_thread+0/349] worker_thread+0x0/0x15d
[263207.350336] 					[keventd_create_kthread+0/122] keventd_create_kthread+0x0/0x7a
[263207.360983] 					[worker_thread+294/349] worker_thread+0x126/0x15d
[263207.371113] 					[default_wake_function+0/15] default_wake_function+0x0/0xf
[263207.381584] 					[default_wake_function+0/15] default_wake_function+0x0/0xf
[263207.392063] 					[worker_thread+0/349] worker_thread+0x0/0x15d
[263207.402020] 					[kthread+208/252] kthread+0xd0/0xfc
[263207.411459] 					[child_rip+10/18] child_rip+0xa/0x12
[263207.420985] 					[_spin_unlock_irq+40/45] _spin_unlock_irq+0x28/0x2d
[263207.431204] 					[restore_args+0/48] restore_args+0x0/0x30
[263207.440998] 					[kthread+0/252] kthread+0x0/0xfc
[263207.450344] 					[child_rip+0/18] child_rip+0x0/0x12
[263207.459862] 					[<ffffffffffffffff>] 0xffffffffffffffff
[263207.469386]    hardirq-on-W at:
[263207.472661] 					[mark_lock+135/1127] mark_lock+0x87/0x467
[263207.482357] 					[__lock_acquire+1412/3168] __lock_acquire+0x584/0xc60
[263207.492567] 					[kfree+525/541] kfree+0x20d/0x21d
[263207.501996] 					[_end+122750808/2124917936] ipath_multicast_detach+0x211/0x231 [ib_ipath]
[263207.513865] 					[lock_acquire+124/160] lock_acquire+0x7c/0xa0
[263207.523735] 					[_end+122750808/2124917936] ipath_multicast_detach+0x211/0x231 [ib_ipath]
[263207.535601] 					[_spin_lock+34/46] _spin_lock+0x22/0x2e
[263207.545298] 					[_end+122750808/2124917936] ipath_multicast_detach+0x211/0x231 [ib_ipath]
[263207.557167] 					[debug_mutex_free_waiter+88/92] debug_mutex_free_waiter+0x58/0x5c
[263207.567990] 					[__mutex_lock_slowpath+624/637] __mutex_lock_slowpath+0x270/0x27d
[263207.578814] 					[wait_for_completion+189/198] wait_for_completion+0xbd/0xc6
[263207.589292] 					[_end+122587956/2124917936] ib_detach_mcast+0x2f/0x33 [ib_core]
[263207.600298] 					[_end+123888044/2124917936] ipoib_mcast_detach+0x3d/0x6e [ib_ipoib]
[263207.611650] 					[_end+123884728/2124917936] ipoib_mcast_leave+0x12d/0x1c8 [ib_ipoib]
[263207.623091] 					[_end+123886246/2124917936] ipoib_mcast_dev_flush+0x100/0x14e [ib_ipoib]
[263207.634877] 					[_end+123886283/2124917936] ipoib_mcast_dev_flush+0x125/0x14e [ib_ipoib]
[263207.646661] 					[_end+123878948/2124917936] ipoib_ib_dev_flush+0x0/0x11f [ib_ipoib]
[263207.658013] 					[_end+123877784/2124917936] ipoib_ib_dev_down+0xa8/0xb7 [ib_ipoib]
[263207.669300] 					[_end+123879087/2124917936] ipoib_ib_dev_flush+0x8b/0x11f [ib_ipoib]
[263207.680739] 					[run_workqueue+177/380] run_workqueue+0xb1/0x17c
[263207.690781] 					[worker_thread+0/349] worker_thread+0x0/0x15d
[263207.700732] 					[keventd_create_kthread+0/122] keventd_create_kthread+0x0/0x7a
[263207.711393] 					[worker_thread+294/349] worker_thread+0x126/0x15d
[263207.721523] 					[default_wake_function+0/15] default_wake_function+0x0/0xf
[263207.732000] 					[default_wake_function+0/15] default_wake_function+0x0/0xf
[263207.742478] 					[worker_thread+0/349] worker_thread+0x0/0x15d
[263207.752436] 					[kthread+208/252] kthread+0xd0/0xfc
[263207.761874] 					[child_rip+10/18] child_rip+0xa/0x12
[263207.771393] 					[_spin_unlock_irq+40/45] _spin_unlock_irq+0x28/0x2d
[263207.781603] 					[restore_args+0/48] restore_args+0x0/0x30
[263207.791388] 					[kthread+0/252] kthread+0x0/0xfc
[263207.800730] 					[child_rip+0/18] child_rip+0x0/0x12
[263207.810251] 					[<ffffffffffffffff>] 0xffffffffffffffff
[263207.819776]  }
[263207.821548]  ... key      at: [_end+122893256/2124917936] __key.5+0x0/0xfffffffffffe369f [ib_ipath]
[263207.830154] 
[263207.830155] the second lock's dependencies:
[263207.836049] -> (mcast_lock){++..} ops: 15329 {
[263207.840692]    initial-use  at:
[263207.843966] 					[<ffffffffffffffff>] 0xffffffffffffffff
[263207.853492]    in-hardirq-W at:
[263207.856757] 					[<ffffffffffffffff>] 0xffffffffffffffff
[263207.866283]    in-softirq-W at:
[263207.869550] 					[<ffffffffffffffff>] 0xffffffffffffffff
[263207.879071]  }
[263207.880843]  ... key      at: [_end+122888936/2124917936] mcast_lock+0x18/0xfffffffffffe4797 [ib_ipath]
[263207.889798]  -> (&idev->n_mcast_grps_lock){-...} ops: 3 {
[263207.895398]     initial-use  at:
[263207.898758] 					  [mark_lock+135/1127] mark_lock+0x87/0x467
[263207.908679] 					  [__lock_acquire+1476/3168] __lock_acquire+0x5c4/0xc60
[263207.919118] 					  [_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263207.931220] 					  [lock_acquire+124/160] lock_acquire+0x7c/0xa0
[263207.941313] 					  [_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263207.953414] 					  [_spin_lock+34/46] _spin_lock+0x22/0x2e
[263207.963335] 					  [_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263207.975429] 					  [_end+122587907/2124917936] ib_attach_mcast+0x2f/0x31 [ib_core]
[263207.986661] 					  [_end+123887919/2124917936] ipoib_mcast_attach+0xe3/0x123 [ib_ipoib]
[263207.998334] 					  [_end+123880632/2124917936] ipoib_mcast_join_finish+0x125/0x3fa [ib_ipoib]
[263208.010527] 					  [check_usage+53/661] check_usage+0x35/0x295
[263208.020622] 					  [lock_timer_base+35/72] lock_timer_base+0x23/0x48
[263208.030971] 					  [__lock_acquire+3080/3168] __lock_acquire+0xc08/0xc60
[263208.041409] 					  [_end+123881884/2124917936] ipoib_mcast_join_complete+0xcb/0x31a [ib_ipoib]
[263208.053680] 					  [_read_unlock_irqrestore+56/71] _read_unlock_irqrestore+0x38/0x47
[263208.064729] 					  [_end+122585085/2124917936] ib_unpack+0xad/0x11c [ib_core]
[263208.075526] 					  [_end+123844451/2124917936] ib_sa_mcmember_rec_callback+0x4c/0x57 [ib_sa]
[263208.087611] 					  [_end+123844738/2124917936] recv_handler+0x3f/0x4b [ib_sa]
[263208.098399] 					  [_end+123718406/2124917936] ib_mad_completion_handler+0x3c7/0x59b [ib_mad]
[263208.110585] 					  [run_workqueue+134/380] run_workqueue+0x86/0x17c
[263208.127122] 					  [_end+123717439/2124917936] ib_mad_completion_handler+0x0/0x59b [ib_mad]
[263208.139119] 					  [run_workqueue+177/380] run_workqueue+0xb1/0x17c
[263208.149389] 					  [worker_thread+0/349] worker_thread+0x0/0x15d
[263208.159571] 					  [keventd_create_kthread+0/122] keventd_create_kthread+0x0/0x7a
[263208.170456] 					  [worker_thread+294/349] worker_thread+0x126/0x15d
[263208.180814] 					  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263208.191516] 					  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263208.202231] 					  [worker_thread+0/349] worker_thread+0x0/0x15d
[263208.212414] 					  [kthread+208/252] kthread+0xd0/0xfc
[263208.222076] 					  [child_rip+10/18] child_rip+0xa/0x12
[263208.231818] 					  [_spin_unlock_irq+40/45] _spin_unlock_irq+0x28/0x2d
[263208.242254] 					  [restore_args+0/48] restore_args+0x0/0x30
[263208.252263] 					  [kthread+0/252] kthread+0x0/0xfc
[263208.261833] 					  [child_rip+0/18] child_rip+0x0/0x12
[263208.271575] 					  [<ffffffffffffffff>] 0xffffffffffffffff
[263208.281317]     hardirq-on-W at:
[263208.284671] 					  [mark_lock+135/1127] mark_lock+0x87/0x467
[263208.294593] 					  [__lock_acquire+1412/3168] __lock_acquire+0x584/0xc60
[263208.305037] 					  [kfree+525/541] kfree+0x20d/0x21d
[263208.314692] 					  [_end+122750808/2124917936] ipath_multicast_detach+0x211/0x231 [ib_ipath]
[263208.326786] 					  [lock_acquire+124/160] lock_acquire+0x7c/0xa0
[263208.336880] 					  [_end+122750808/2124917936] ipath_multicast_detach+0x211/0x231 [ib_ipath]
[263208.348974] 					  [_spin_lock+34/46] _spin_lock+0x22/0x2e
[263208.358896] 					  [_end+122750808/2124917936] ipath_multicast_detach+0x211/0x231 [ib_ipath]
[263208.370987] 					  [debug_mutex_free_waiter+88/92] debug_mutex_free_waiter+0x58/0x5c
[263208.382037] 					  [__mutex_lock_slowpath+624/637] __mutex_lock_slowpath+0x270/0x27d
[263208.393086] 					  [wait_for_completion+189/198] wait_for_completion+0xbd/0xc6
[263208.403789] 					  [_end+122587956/2124917936] ib_detach_mcast+0x2f/0x33 [ib_core]
[263208.415020] 					  [_end+123888044/2124917936] ipoib_mcast_detach+0x3d/0x6e [ib_ipoib]
[263208.426608] 					  [_end+123884728/2124917936] ipoib_mcast_leave+0x12d/0x1c8 [ib_ipoib]
[263208.438274] 					  [_end+123886246/2124917936] ipoib_mcast_dev_flush+0x100/0x14e [ib_ipoib]
[263208.450286] 					  [_end+123886283/2124917936] ipoib_mcast_dev_flush+0x125/0x14e [ib_ipoib]
[263208.462296] 					  [_end+123878948/2124917936] ipoib_ib_dev_flush+0x0/0x11f [ib_ipoib]
[263208.473872] 					  [_end+123877784/2124917936] ipoib_ib_dev_down+0xa8/0xb7 [ib_ipoib]
[263208.485366] 					  [_end+123879087/2124917936] ipoib_ib_dev_flush+0x8b/0x11f [ib_ipoib]
[263208.497030] 					  [run_workqueue+177/380] run_workqueue+0xb1/0x17c
[263208.507298] 					  [worker_thread+0/349] worker_thread+0x0/0x15d
[263208.517475] 					  [keventd_create_kthread+0/122] keventd_create_kthread+0x0/0x7a
[263208.528355] 					  [worker_thread+294/349] worker_thread+0x126/0x15d
[263208.538708] 					  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263208.549412] 					  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263208.560116] 					  [worker_thread+0/349] worker_thread+0x0/0x15d
[263208.570299] 					  [kthread+208/252] kthread+0xd0/0xfc
[263208.579968] 					  [child_rip+10/18] child_rip+0xa/0x12
[263208.589713] 					  [_spin_unlock_irq+40/45] _spin_unlock_irq+0x28/0x2d
[263208.600150] 					  [restore_args+0/48] restore_args+0x0/0x30
[263208.610157] 					  [kthread+0/252] kthread+0x0/0xfc
[263208.619724] 					  [child_rip+0/18] child_rip+0x0/0x12
[263208.629469] 					  [<ffffffffffffffff>] 0xffffffffffffffff
[263208.639220]   }
[263208.641084]   ... key      at: [_end+122893256/2124917936] __key.5+0x0/0xfffffffffffe369f [ib_ipath]
[263208.649786]  ... acquired at:
[263208.652862]    [add_lock_to_list+125/169] add_lock_to_list+0x7d/0xa9
[263208.658899]    [__lock_acquire+2822/3168] __lock_acquire+0xb06/0xc60
[263208.664936]    [_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263208.672640]    [lock_acquire+124/160] lock_acquire+0x7c/0xa0
[263208.678330]    [_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263208.686036]    [_spin_lock+34/46] _spin_lock+0x22/0x2e
[263208.691553]    [_end+122750035/2124917936] ipath_multicast_attach+0x178/0x26c [ib_ipath]
[263208.699261]    [_end+122587907/2124917936] ib_attach_mcast+0x2f/0x31 [ib_core]
[263208.706086]    [_end+123887919/2124917936] ipoib_mcast_attach+0xe3/0x123 [ib_ipoib]
[263208.713342]    [_end+123880632/2124917936] ipoib_mcast_join_finish+0x125/0x3fa [ib_ipoib]
[263208.721134]    [check_usage+53/661] check_usage+0x35/0x295
[263208.726832]    [lock_timer_base+35/72] lock_timer_base+0x23/0x48
[263208.732782]    [__lock_acquire+3080/3168] __lock_acquire+0xc08/0xc60
[263208.738818]    [_end+123881884/2124917936] ipoib_mcast_join_complete+0xcb/0x31a [ib_ipoib]
[263208.746688]    [_read_unlock_irqrestore+56/71] _read_unlock_irqrestore+0x38/0x47
[263208.753333]    [_end+122585085/2124917936] ib_unpack+0xad/0x11c [ib_core]
[263208.759722]    [_end+123844451/2124917936] ib_sa_mcmember_rec_callback+0x4c/0x57 [ib_sa]
[263208.767435]    [_end+123844738/2124917936] recv_handler+0x3f/0x4b [ib_sa]
[263208.773822]    [_end+123718406/2124917936] ib_mad_completion_handler+0x3c7/0x59b [ib_mad]
[263208.781622]    [run_workqueue+134/380] run_workqueue+0x86/0x17c
[263208.787486]    [_end+123717439/2124917936] ib_mad_completion_handler+0x0/0x59b [ib_mad]
[263208.795106]    [run_workqueue+177/380] run_workqueue+0xb1/0x17c
[263208.800969]    [worker_thread+0/349] worker_thread+0x0/0x15d
[263208.806744]    [keventd_create_kthread+0/122] keventd_create_kthread+0x0/0x7a
[263208.813215]    [worker_thread+294/349] worker_thread+0x126/0x15d
[263208.819164]    [default_wake_function+0/15] default_wake_function+0x0/0xf
[263208.825469]    [default_wake_function+0/15] default_wake_function+0x0/0xf
[263208.831764]    [worker_thread+0/349] worker_thread+0x0/0x15d
[263208.837541]    [kthread+208/252] kthread+0xd0/0xfc
[263208.842796]    [child_rip+10/18] child_rip+0xa/0x12
[263208.848137]    [_spin_unlock_irq+40/45] _spin_unlock_irq+0x28/0x2d
[263208.854174]    [restore_args+0/48] restore_args+0x0/0x30
[263208.859778]    [kthread+0/252] kthread+0x0/0xfc
[263208.864946]    [child_rip+0/18] child_rip+0x0/0x12
[263208.870289]    [<ffffffffffffffff>] 0xffffffffffffffff
[263208.875632] 
[263208.877236] 
[263208.877236] stack backtrace:
[263208.881817] 
[263208.881818] Call Trace:
[263208.885968]  [print_irq_inversion_bug+292/307] print_irq_inversion_bug+0x124/0x133
[263208.892513]  [check_usage_backwards+65/74] check_usage_backwards+0x41/0x4a
[263208.898711]  [mark_lock+630/1127] mark_lock+0x276/0x467
[263208.904045]  [__lock_acquire+1412/3168] __lock_acquire+0x584/0xc60
[263208.909813]  [kfree+525/541] kfree+0x20d/0x21d
[263208.914808]  [_end+122750808/2124917936] :ib_ipath:ipath_multicast_detach+0x211/0x231
[263208.922153]  [lock_acquire+124/160] lock_acquire+0x7c/0xa0
[263208.927582]  [_end+122750808/2124917936] :ib_ipath:ipath_multicast_detach+0x211/0x231
[263208.934927]  [_spin_lock+34/46] _spin_lock+0x22/0x2e
[263208.940182]  [_end+122750808/2124917936] :ib_ipath:ipath_multicast_detach+0x211/0x231
[263208.947526]  [debug_mutex_free_waiter+88/92] debug_mutex_free_waiter+0x58/0x5c
[263208.953904]  [__mutex_lock_slowpath+624/637] __mutex_lock_slowpath+0x270/0x27d
[263208.960277]  [wait_for_completion+189/198] wait_for_completion+0xbd/0xc6
[263208.966307]  [_end+122587956/2124917936] :ib_core:ib_detach_mcast+0x2f/0x33
[263208.972766]  [_end+123888044/2124917936] :ib_ipoib:ipoib_mcast_detach+0x3d/0x6e
[263208.979575]  [_end+123884728/2124917936] :ib_ipoib:ipoib_mcast_leave+0x12d/0x1c8
[263208.986469]  [_end+123886246/2124917936] :ib_ipoib:ipoib_mcast_dev_flush+0x100/0x14e
[263208.993724]  [_end+123886283/2124917936] :ib_ipoib:ipoib_mcast_dev_flush+0x125/0x14e
[263209.000981]  [_end+123878948/2124917936] :ib_ipoib:ipoib_ib_dev_flush+0x0/0x11f
[263209.007790]  [_end+123877784/2124917936] :ib_ipoib:ipoib_ib_dev_down+0xa8/0xb7
[263209.014510]  [_end+123879087/2124917936] :ib_ipoib:ipoib_ib_dev_flush+0x8b/0x11f
[263209.021409]  [run_workqueue+177/380] run_workqueue+0xb1/0x17c
[263209.027001]  [worker_thread+0/349] worker_thread+0x0/0x15d
[263209.032508]  [keventd_create_kthread+0/122] keventd_create_kthread+0x0/0x7a
[263209.038711]  [worker_thread+294/349] worker_thread+0x126/0x15d
[263209.050667]  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263209.056697]  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263209.062726]  [worker_thread+0/349] worker_thread+0x0/0x15d
[263209.068233]  [kthread+208/252] kthread+0xd0/0xfc
[263209.073219]  [child_rip+10/18] child_rip+0xa/0x12
[263209.078294]  [_spin_unlock_irq+40/45] _spin_unlock_irq+0x28/0x2d
[263209.084062]  [restore_args+0/48] restore_args+0x0/0x30
[263209.089396]  [kthread+0/252] kthread+0x0/0xfc
[263209.094294]  [child_rip+0/18] child_rip+0x0/0x12
[263209.099362] 
[263209.101175] BUG: workqueue leaked lock or atomic: ipoib/0x00000000/6662
[263209.107904]     last function: ipoib_ib_dev_flush+0x0/0x11f [ib_ipoib]
[263209.114575] 1 lock held by ipoib/6662:
[263209.118430]  #0:  (&priv->mcast_mutex){--..}, at: [mutex_lock+35/39] mutex_lock+0x23/0x27
[263209.127012] 
[263209.127013] Call Trace:
[263209.131160]  [run_workqueue+302/380] run_workqueue+0x12e/0x17c
[263209.136841]  [worker_thread+0/349] worker_thread+0x0/0x15d
[263209.142354]  [keventd_create_kthread+0/122] keventd_create_kthread+0x0/0x7a
[263209.148554]  [worker_thread+294/349] worker_thread+0x126/0x15d
[263209.154237]  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263209.160264]  [default_wake_function+0/15] default_wake_function+0x0/0xf
[263209.166297]  [worker_thread+0/349] worker_thread+0x0/0x15d
[263209.171807]  [kthread+208/252] kthread+0xd0/0xfc
[263209.176801]  [child_rip+10/18] child_rip+0xa/0x12
[263209.181875]  [_spin_unlock_irq+40/45] _spin_unlock_irq+0x28/0x2d
[263209.187646]  [restore_args+0/48] restore_args+0x0/0x30
[263209.192977]  [kthread+0/252] kthread+0x0/0xfc
[263209.197875]  [child_rip+0/18] child_rip+0x0/0x12
[263209.202951] 
[263209.204559] BUG: workqueue leaked lock or atomic: ipoib/0x00000000/6662
[263209.211282]     last function: ipoib_ib_dev_flush+0x0/0x11f [ib_ipoib]
[263209.217946] 1 lock held by ipoib/6662:
[263209.221807]  #0:  (&priv->mcast_mutex){--..}, at: [mutex_lock+35/39] mutex_lock+0x23/0x27
...
[many more repeating traces]


-- 
Bernd Schubert
Q-Leap Networks GmbH



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