4.2-rc5 rcu stalls.

[Dave Jones]

[ 2120.854974] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 2120.855128] 	Tasks blocked on level-0 rcu_node (CPUs 0-3): P1497
[ 2120.855263] 	(detected by 2, t=65002 jiffies, g=78835, c=78834, q=0)
[ 2120.855403] trinity-watchdo R  running task    14336  1497   1496 0x00080000
[ 2120.855563]  ffff8804b94e3c88 ffffffffa17fa0b0 ffff8805010a1b40 ffff8804f58b51c0
[ 2120.855728]  ffff8805010a1b40 ffff8804b94e3c78 0000000000000000 ffff8804b94e4000
[ 2120.855893]  0000000000000001 0000000000000001 0000000000000002 ffff8804b94e3ca8
[ 2120.856062] Call Trace:
[ 2120.856116]  [<ffffffffa17fa0b0>] ? preempt_schedule_irq+0x40/0xa0
[ 2120.856252]  [<ffffffffa17fa0b6>] preempt_schedule_irq+0x46/0xa0
[ 2120.856387]  [<ffffffffa1801129>] retint_kernel+0x1b/0x2d
[ 2120.856507]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2120.856627]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2120.856752]  [<ffffffffa10d675e>] ? lock_release+0x33e/0x700
[ 2120.856878]  [<ffffffffa108be29>] ? group_send_sig_info+0x79/0x120
[ 2120.857015]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2120.857137]  [<ffffffffa108c07b>] ? kill_pid_info+0x9b/0x150
[ 2120.857259]  [<ffffffffa108c098>] kill_pid_info+0xb8/0x150
[ 2120.857380]  [<ffffffffa108c000>] ? kill_pid_info+0x20/0x150
[ 2120.857508]  [<ffffffffa108c244>] SYSC_kill+0xf4/0x2b0
[ 2120.857620]  [<ffffffffa108c1ed>] ? SYSC_kill+0x9d/0x2b0
[ 2120.857736]  [<ffffffffa10d354b>] ? trace_hardirqs_on_caller+0x14b/0x1e0
[ 2120.857882]  [<ffffffffa10d35ed>] ? trace_hardirqs_on+0xd/0x10
[ 2120.858012]  [<ffffffffa1192ed3>] ? context_tracking_user_exit+0x13/0x20
[ 2120.858161]  [<ffffffffa1012db7>] ? syscall_trace_enter_phase1+0xf7/0x150
[ 2120.858314]  [<ffffffffa1001017>] ? trace_hardirqs_on_thunk+0x17/0x19
[ 2120.858456]  [<ffffffffa108e64e>] SyS_kill+0xe/0x10
[ 2120.858563]  [<ffffffffa1800597>] entry_SYSCALL_64_fastpath+0x12/0x6f
[ 2120.858706] trinity-watchdo R  running task    14336  1497   1496 0x00080000
[ 2120.858863]  ffff8804b94e3c88 ffffffffa17fa0b0 ffff8805010a1b40 ffff8804f58b51c0
[ 2120.859028]  ffff8805010a1b40 ffff8804b94e3c78 0000000000000000 ffff8804b94e4000
[ 2120.859194]  0000000000000001 0000000000000001 0000000000000002 ffff8804b94e3ca8
[ 2120.859358] Call Trace:
[ 2120.859410]  [<ffffffffa17fa0b0>] ? preempt_schedule_irq+0x40/0xa0
[ 2120.859545]  [<ffffffffa17fa0b6>] preempt_schedule_irq+0x46/0xa0
[ 2120.859676]  [<ffffffffa1801129>] retint_kernel+0x1b/0x2d
[ 2120.859794]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2120.859916]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2120.860037]  [<ffffffffa10d675e>] ? lock_release+0x33e/0x700
[ 2120.860163]  [<ffffffffa108be29>] ? group_send_sig_info+0x79/0x120
[ 2120.860297]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2120.860422]  [<ffffffffa108c07b>] ? kill_pid_info+0x9b/0x150
[ 2120.860548]  [<ffffffffa108c098>] kill_pid_info+0xb8/0x150
[ 2120.860670]  [<ffffffffa108c000>] ? kill_pid_info+0x20/0x150
[ 2120.860793]  [<ffffffffa108c244>] SYSC_kill+0xf4/0x2b0
[ 2120.860906]  [<ffffffffa108c1ed>] ? SYSC_kill+0x9d/0x2b0
[ 2120.861022]  [<ffffffffa10d354b>] ? trace_hardirqs_on_caller+0x14b/0x1e0
[ 2120.861172]  [<ffffffffa10d35ed>] ? trace_hardirqs_on+0xd/0x10
[ 2120.861301]  [<ffffffffa1192ed3>] ? context_tracking_user_exit+0x13/0x20
[ 2120.861449]  [<ffffffffa1012db7>] ? syscall_trace_enter_phase1+0xf7/0x150
[ 2120.866641]  [<ffffffffa1001017>] ? trace_hardirqs_on_thunk+0x17/0x19
[ 2120.871850]  [<ffffffffa108e64e>] SyS_kill+0xe/0x10
[ 2120.877038]  [<ffffffffa1800597>] entry_SYSCALL_64_fastpath+0x12/0x6f
[ 2316.020180] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 2316.025395] 	Tasks blocked on level-0 rcu_node (CPUs 0-3): P1497
[ 2316.030662] 	(detected by 2, t=260007 jiffies, g=78835, c=78834, q=0)
[ 2316.035890] trinity-watchdo R  running task    14336  1497   1496 0x00080000
[ 2316.041153]  ffff8804b94e3c88 ffffffffa17fa0b0 ffff8805010a1b40 ffff8800cd2db680
[ 2316.046552]  ffff8805010a1b40 ffff8804b94e3c78 0000000000000000 ffff8804b94e4000
[ 2316.052039]  0000000000000001 0000000000000001 0000000000000002 ffff8804b94e3ca8
[ 2316.057560] Call Trace:
[ 2316.063066]  [<ffffffffa17fa0b0>] ? preempt_schedule_irq+0x40/0xa0
[ 2316.068594]  [<ffffffffa17fa0b6>] preempt_schedule_irq+0x46/0xa0
[ 2316.074034]  [<ffffffffa1801129>] retint_kernel+0x1b/0x2d
[ 2316.079419]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2316.084778]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2316.090041]  [<ffffffffa10d675e>] ? lock_release+0x33e/0x700
[ 2316.095219]  [<ffffffffa108be29>] ? group_send_sig_info+0x79/0x120
[ 2316.100359]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2316.105489]  [<ffffffffa108c07b>] ? kill_pid_info+0x9b/0x150
[ 2316.110584]  [<ffffffffa108c098>] kill_pid_info+0xb8/0x150
[ 2316.115594]  [<ffffffffa108c000>] ? kill_pid_info+0x20/0x150
[ 2316.120568]  [<ffffffffa108c244>] SYSC_kill+0xf4/0x2b0
[ 2316.125476]  [<ffffffffa108c1ed>] ? SYSC_kill+0x9d/0x2b0
[ 2316.130391]  [<ffffffffa10d354b>] ? trace_hardirqs_on_caller+0x14b/0x1e0
[ 2316.135348]  [<ffffffffa10d35ed>] ? trace_hardirqs_on+0xd/0x10
[ 2316.140351]  [<ffffffffa1192ed3>] ? context_tracking_user_exit+0x13/0x20
[ 2316.145399]  [<ffffffffa1012db7>] ? syscall_trace_enter_phase1+0xf7/0x150
[ 2316.150413]  [<ffffffffa1001017>] ? trace_hardirqs_on_thunk+0x17/0x19
[ 2316.155461]  [<ffffffffa108e64e>] SyS_kill+0xe/0x10
[ 2316.160499]  [<ffffffffa1800597>] entry_SYSCALL_64_fastpath+0x12/0x6f
[ 2316.165609] trinity-watchdo R  running task    14336  1497   1496 0x00080000
[ 2316.170851]  ffff8804b94e3c88 ffffffffa17fa0b0 ffff8805010a1b40 ffff8800cd2db680
[ 2316.176131]  ffff8805010a1b40 ffff8804b94e3c78 0000000000000000 ffff8804b94e4000
[ 2316.181443]  0000000000000001 0000000000000001 0000000000000002 ffff8804b94e3ca8
[ 2316.186735] Call Trace:
[ 2316.192021]  [<ffffffffa17fa0b0>] ? preempt_schedule_irq+0x40/0xa0
[ 2316.197426]  [<ffffffffa17fa0b6>] preempt_schedule_irq+0x46/0xa0
[ 2316.202818]  [<ffffffffa1801129>] retint_kernel+0x1b/0x2d
[ 2316.208181]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2316.213541]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2316.218823]  [<ffffffffa10d675e>] ? lock_release+0x33e/0x700
[ 2316.224042]  [<ffffffffa108be29>] ? group_send_sig_info+0x79/0x120
[ 2316.229215]  [<ffffffffa10ad5e1>] ? get_parent_ip+0x11/0x50
[ 2316.234346]  [<ffffffffa108c07b>] ? kill_pid_info+0x9b/0x150
[ 2316.239491]  [<ffffffffa108c098>] kill_pid_info+0xb8/0x150
[ 2316.244538]  [<ffffffffa108c000>] ? kill_pid_info+0x20/0x150
[ 2316.249525]  [<ffffffffa108c244>] SYSC_kill+0xf4/0x2b0
[ 2316.254503]  [<ffffffffa108c1ed>] ? SYSC_kill+0x9d/0x2b0
[ 2316.259492]  [<ffffffffa10d354b>] ? trace_hardirqs_on_caller+0x14b/0x1e0
[ 2316.264565]  [<ffffffffa10d35ed>] ? trace_hardirqs_on+0xd/0x10
[ 2316.269594]  [<ffffffffa1192ed3>] ? context_tracking_user_exit+0x13/0x20
[ 2316.274681]  [<ffffffffa1012db7>] ? syscall_trace_enter_phase1+0xf7/0x150
[ 2316.279772]  [<ffffffffa1001017>] ? trace_hardirqs_on_thunk+0x17/0x19
[ 2316.284873]  [<ffffffffa108e64e>] SyS_kill+0xe/0x10
[ 2316.289981]  [<ffffffffa1800597>] entry_SYSCALL_64_fastpath+0x12/0x6f

some time later..

[66859.981825] INFO: rcu_preempt detected stalls on CPUs/tasks:
[66859.987582] 	Tasks blocked on level-0 rcu_node (CPUs 0-3): P20837
[66859.993375] 	(detected by 2, t=65013 jiffies, g=5129960, c=5129959, q=0)
[66859.999146] trinity-c255    R  running task    13728 20837  20581 0x00080002
[66860.004980]  ffff8804d1417cb8 ffffffffa17fa0b0 ffff8804e4dab680 ffff8804ba2951c0
[66860.010831]  ffff8804e4dab680 ffff8804d1417ca8 0000000000000000 ffff8804d1418000
[66860.016666]  ffff88045f49a440 ffff8805047a0620 ffff880480fdf528 ffff8804d1417cd8
[66860.022423] Call Trace:
[66860.028116]  [<ffffffffa17fa0b0>] ? preempt_schedule_irq+0x40/0xa0
[66860.033912]  [<ffffffffa17fa0b6>] preempt_schedule_irq+0x46/0xa0
[66860.039663]  [<ffffffffa1801129>] retint_kernel+0x1b/0x2d
[66860.045352]  [<ffffffffa10d6299>] ? lock_acquire+0xd9/0x260
[66860.051044]  [<ffffffffa10ed3b1>] ? rcu_is_watching+0x1/0x60
[66860.056725]  [<ffffffffa1212abc>] ? dput+0x10c/0x390
[66860.062377]  [<ffffffffa12129d9>] ? dput+0x29/0x390
[66860.068103]  [<ffffffffa11fb6f1>] __fput+0x181/0x200
[66860.073797]  [<ffffffffa11fb576>] ? __fput+0x6/0x200
[66860.079444]  [<ffffffffa11fb7be>] ____fput+0xe/0x10
[66860.085070]  [<ffffffffa109dfdd>] task_work_run+0x8d/0xc0
[66860.090699]  [<ffffffffa107cef6>] do_exit+0x416/0xc60
[66860.096304]  [<ffffffffa1192ed3>] ? context_tracking_user_exit+0x13/0x20
[66860.101978]  [<ffffffffa107ec64>] do_group_exit+0x54/0xe0
[66860.107684]  [<ffffffffa107ed04>] SyS_exit_group+0x14/0x20
[66860.113360]  [<ffffffffa1800597>] entry_SYSCALL_64_fastpath+0x12/0x6f
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