Heavy I/O blocks FreeBSD box for several seconds

[Attilio Rao]

Do you have a corefile for this panic?

Attilio

2011/7/25 Rick Macklem <rmacklem at uoguelph.ca>:
> Steve Kargl wrote:
>> On Mon, Jul 25, 2011 at 01:00:27PM +0300, Andriy Gapon wrote:
>> > on 12/07/2011 11:05 Andriy Gapon said the following:
>> > > I think that the best thing you can further provide (as objective
>> > > evidence for
>> > > the problem at hand) is ktr(4) traces for at least KTR_SCHED mask.
>> > > Perhaps you
>> > > even already have them from your previous sessions with Jeff.
>> > >
>> > > P.S. This is not a promise to actually debug this issue based on
>> > > the traces :-)
>> >
>> > So do you have an opportunity to provide this kind of information?
>> > Actually I would like KTR_SCHED|KTR_INTR|KTR_PROC|KTR_SYSC mask.
>> > Also, sysctl kern.sched output would be useful too.
>> > This is for the ULE case, of course.
>> >
>>
>> I won't have time until next week to investigate.
>>
> hrs sent me this panic. I'm wondering if it might be relevant to this?
> spin lock 0xffffffff80cb52c0 (sched lock 1) held by 0xffffff0012c7f8c0 (tid 100317) too long
> panic: spin lock held too long
> cpuid = 0
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> kdb_backtrace() at kdb_backtrace+0x37
> panic() at panic+0x187
> _mtx_lock_spin_failed() at _mtx_lock_spin_failed+0x39
> _mtx_lock_spin() at _mtx_lock_spin+0x9e
> sched_add() at sched_add+0x117
> setrunnable() at setrunnable+0x78
> sleepq_signal() at sleepq_signal+0x7a
> cv_signal() at cv_signal+0x3b
> xprt_active() at xprt_active+0xe3
> svc_vc_soupcall() at svc_vc_soupcall+0xc
> sowakeup() at sowakeup+0x69
> tcp_do_segment() at tcp_do_segment+0x2cbd
> tcp_input() at tcp_input+0xcdd
> ip_input() at ip_input+0xac
> netisr_dispatch_src() at netisr_dispatch_src+0x7e
> ether_demux() at ether_demux+0x14d
> ether_input() at ether_input+0x17d
> em_rxeof() at em_rxeof+0x1ca
> em_handle_que() at em_handle_que+0x5b
> taskqueue_run_locked() at taskqueue_run_locked+0x85
> taskqueue_thread_loop() at taskqueue_thread_loop+0x4e
> fork_exit() at fork_exit+0x11f
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffff8000160d00, rbp = 0 ---
> KDB: enter: panic
> [thread pid 0 tid 100033 ]
> Stopped at      kdb_enter+0x3b: movq    $0,0x6b4e62(%rip)
> db> ps
>
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