On Tue, Aug 04, 2015 at 12:54:35AM -0400, Sasha Levin wrote:
> On 08/03/2015 06:03 PM, Paul E. McKenney wrote:
> >> > Ugh, that doesn't revert cleanly. Got something handy ?
> > I do not, but perhaps either Sasha or Frederic do.
>
> I've attached a revert courtesy of Peter.
Thanks. At first I thought this was doing the trick, but then I hit this again.
[23643.545873] INFO: rcu_preempt detected stalls on CPUs/tasks:
[23643.546031] Tasks blocked on level-0 rcu_node (CPUs 0-3): P31722
[23643.546173] (detected by 3, t=65002 jiffies, g=2256887, c=2256886, q=0)
[23643.546326] trinity-watchdo R running task 14336 31722 31721 0x00080000
[23643.546488] ffff8804fcfe7cc8 000000000000ded0 0000000000000002
ffff8804f58bb680
[23643.546661] ffff8800ce4951c0 ffff8804fcfe7cb8 ffff8804fcfe8000
ffff8804f6552608
[23643.546830] 0000000000000009 ffff8804fcfe7e88 0000000000000009
ffff8804fcfe7ce8
[23643.547001] Call Trace:
[23643.547058] [<ffffffff887fa2b2>] preempt_schedule_common+0x22/0x40
[23643.547201] [<ffffffff887fa2ef>] preempt_schedule+0x1f/0x30
[23643.547329] [<ffffffff88001058>] ___preempt_schedule+0x12/0x14
[23643.547465] [<ffffffff8808b76d>] ? do_send_sig_info+0x5d/0x80
[23643.547599] [<ffffffff887fff32>] ? _raw_spin_unlock_irqrestore+0x42/0x70
[23643.547753] [<ffffffff887fff50>] ? _raw_spin_unlock_irqrestore+0x60/0x70
[23643.547910] [<ffffffff8808b76d>] do_send_sig_info+0x5d/0x80
[23643.548039] [<ffffffff8808be62>] group_send_sig_info+0xb2/0x120
[23643.548175] [<ffffffff8808bdb5>] ? group_send_sig_info+0x5/0x120
[23643.548314] [<ffffffff880ea62f>] ? rcu_read_lock_held+0x4f/0x60
[23643.548451] [<ffffffff8808c05f>] kill_pid_info+0x7f/0x150
[23643.548576] [<ffffffff8808c000>] ? kill_pid_info+0x20/0x150
[23643.548705] [<ffffffff8808c244>] SYSC_kill+0xf4/0x2b0
[23643.548821] [<ffffffff8808c1ed>] ? SYSC_kill+0x9d/0x2b0
[23643.548942] [<ffffffff880d35cb>] ? trace_hardirqs_on_caller+0x14b/0x1e0
[23643.549097] [<ffffffff880d366d>] ? trace_hardirqs_on+0xd/0x10
[23643.549231] [<ffffffff88192f63>] ? context_tracking_user_exit+0x13/0x20
[23643.549387] [<ffffffff88012c47>] ? syscall_trace_enter_phase1+0xf7/0x150
[23643.549540] [<ffffffff88001017>] ? trace_hardirqs_on_thunk+0x17/0x19
[23643.549687] [<ffffffff8808e64e>] SyS_kill+0xe/0x10
[23643.549799] [<ffffffff88800997>] entry_SYSCALL_64_fastpath+0x12/0x6f
[23643.549946] trinity-watchdo R running task 14336 31722 31721 0x00080000
[23643.550106] ffff8804fcfe7cc8 000000000000ded0 0000000000000002
ffff8804f58bb680
[23643.550276] ffff8800ce4951c0 ffff8804fcfe7cb8 ffff8804fcfe8000
ffff8804f6552608
[23643.550446] 0000000000000009 ffff8804fcfe7e88 0000000000000009
ffff8804fcfe7ce8
[23643.550615] Call Trace:
[23643.550668] [<ffffffff887fa2b2>] preempt_schedule_common+0x22/0x40
[23643.550809] [<ffffffff887fa2ef>] preempt_schedule+0x1f/0x30
[23643.550935] [<ffffffff88001058>] ___preempt_schedule+0x12/0x14
[23643.551072] [<ffffffff8808b76d>] ? do_send_sig_info+0x5d/0x80
[23643.551204] [<ffffffff887fff32>] ? _raw_spin_unlock_irqrestore+0x42/0x70
[23643.551358] [<ffffffff887fff50>] ? _raw_spin_unlock_irqrestore+0x60/0x70
[23643.551515] [<ffffffff8808b76d>] do_send_sig_info+0x5d/0x80
[23643.551642] [<ffffffff8808be62>] group_send_sig_info+0xb2/0x120
[23643.551779] [<ffffffff8808bdb5>] ? group_send_sig_info+0x5/0x120
[23643.551915] [<ffffffff880ea62f>] ? rcu_read_lock_held+0x4f/0x60
[23643.557757] [<ffffffff8808c05f>] kill_pid_info+0x7f/0x150
[23643.563613] [<ffffffff8808c000>] ? kill_pid_info+0x20/0x150
[23643.569450] [<ffffffff8808c244>] SYSC_kill+0xf4/0x2b0
[23643.575270] [<ffffffff8808c1ed>] ? SYSC_kill+0x9d/0x2b0
[23643.581025] [<ffffffff880d35cb>] ? trace_hardirqs_on_caller+0x14b/0x1e0
[23643.586867] [<ffffffff880d366d>] ? trace_hardirqs_on+0xd/0x10
[23643.592620] [<ffffffff88192f63>] ? context_tracking_user_exit+0x13/0x20
[23643.598317] [<ffffffff88012c47>] ? syscall_trace_enter_phase1+0xf7/0x150
[23643.603903] [<ffffffff88001017>] ? trace_hardirqs_on_thunk+0x17/0x19
[23643.609404] [<ffffffff8808e64e>] SyS_kill+0xe/0x10
[23643.614788] [<ffffffff88800997>] entry_SYSCALL_64_fastpath+0x12/0x6f
Dave
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