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Date: Sat, 30 Jul 2011 11:07:01 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Rick Macklem <rmacklem@uoguelph.ca>
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Cc: FreeBSD-Current <freebsd-current@FreeBSD.org>
Subject: Re: Heavy I/O blocks FreeBSD box for several seconds
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on 26/07/2011 00:44 Rick Macklem said the following:
> hrs sent me this panic. I'm wondering if it might be relevant to this?

To 'this' what?
A panic is a panic.

> spin lock 0xffffffff80cb52c0 (sched lock 1) held by 0xffffff0012c7f8c0 (tid 100317) too long
> panic: spin lock held too long

I guess it's more related to the thread on stable@ which has the panic message
as its subject.

> 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
> 

-- 
Andriy Gapon