Date: Tue, 8 Jan 2013 02:02:33 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: d@delphij.net Cc: freebsd-current@freebsd.org Subject: Re: sysctl -a causes kernel trap 12 Message-ID: <20130108000233.GZ82219@kib.kiev.ua> In-Reply-To: <50EB602F.9050300@delphij.net> References: <50EB602F.9050300@delphij.net>
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On Mon, Jan 07, 2013 at 03:54:23PM -0800, Xin Li wrote:
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> Hi,
>
> I've recently (by mid-December I think) noticed that sysctl -a can
> sometimes cause kernel trap 12. Tried enabling INVARIANTS and the
> problem mysteriously disappeared. After some experiments on this, it
> seems that this can be triggered by sysctl -a but the system have an 1
> in 10 chance to survive. When INVARIANTS is enabled however, I can
> not trigger the panic. "sysctl hw" triggers the panic sometimes, but
> not always.
>
> Do anybody have clue on this? The system hangs hard when it panics so
> kernel debugger won't work. When it panics, the fault instruction
> pointer is always 0x20:0xffffffff808d61c9, which is
> sys/kern/subr_turnstile.c:297:
>
> > /* Resort td on the list if needed. */ if
> > (!turnstile_adjust_thread(ts, td)) { mtx_unlock_spin(&ts->ts_lock);
> > // 297 // return; }
>
> This sounds like a race condition but I haven't yet able to track it
> down...
Could you try to isolate the sub-leaf under hw which causes the panic ?
Just shot in the dark, do you have Intel GPU gemified driver loaded ?
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