Date: Thu, 25 Apr 2002 11:01:33 -0700 From: Kris Kennaway <kris@obsecurity.org> To: John Baldwin <jhb@FreeBSD.org> Cc: Kris Kennaway <kris@obsecurity.org>, current@FreeBSD.org Subject: Re: 4 panics under 5.0 on ports cluster Message-ID: <20020425110133.A48383@xor.obsecurity.org> In-Reply-To: <XFMail.20020425131050.jhb@FreeBSD.org>; from jhb@FreeBSD.org on Thu, Apr 25, 2002 at 01:10:50PM -0400 References: <20020425013922.A27152@xor.obsecurity.org> <XFMail.20020425131050.jhb@FreeBSD.org>
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On Thu, Apr 25, 2002 at 01:10:50PM -0400, John Baldwin wrote:
>
> On 25-Apr-2002 Kris Kennaway wrote:
> > panic: sleeping thread owns a mutex
> > Uptime: 8h52m59s
> > (kgdb) bt
> >#0 dumpsys () at /local0/scratch/usr/src/sys/kern/kern_shutdown.c:506
> >#1 0xc0207cb0 in boot (howto=260) at
> >#/local0/scratch/usr/src/sys/kern/kern_shutdown.c:338
> >#2 0xc020814f in panic (fmt=0xc0367580 "sleeping thread owns a mutex")
> > at /local0/scratch/usr/src/sys/kern/kern_shutdown.c:648
> >#3 0xc0200a35 in propagate_priority (td=0xcd23d400)
> > at /local0/scratch/usr/src/sys/kern/kern_mutex.c:110
>
> Can you go to this frame, then dump the contents of 'm' to find the misbehaving
> mutex?
$2 = {mtx_object = {lo_class = 0xc03b1fc0, lo_name = 0xc76785a0 "PCPU 16384", lo_flags = 4390912,
lo_list = {stqe_next = 0x0}, lo_witness = 0x0}, mtx_lock = 3453968642, mtx_recurse = 0,
mtx_blocked = {tqh_first = 0xcd23d400, tqh_last = 0xcd23d428}, mtx_contested = {le_next = 0x0,
le_prev = 0xcddf6160}}
> WITNESS should have warned about this but I guess getting people to run
> WITNESS is too much to ask.
WITNESS disables itself after about 30 seconds under load on the ports
cluster..something about some resource becoming exhausted. I tried
increasing the number of whatever resource it was by a factor of 8,
but it was still occurring after a longer time interval, so I gave up
and just turned it off.
Kris
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