Re: 4BSD Scheduler Problem on 5.3
From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 04/01/05
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Date: Fri, 1 Apr 2005 01:03:14 +0000 (GMT) To: John Baldwin <jhb@FreeBSD.org>
On Thu, 31 Mar 2005, John Baldwin wrote:
> On Thursday 31 March 2005 03:38 pm, William Michael Grim wrote:
> > Hello.
> >
> > I keep having kernel panics every couple weeks on my system. It occurs in
> > the sched_switch() function. There are several other statements in the
> > backtrace involving "??"; what are those?
> >
> > I have attached the dump output and system info to this email. Any
> > feedback would be helpful.
> >
> > Thanks so much for your help.
>
> The real trace ends with Xint0x80_syscall(). The rest after that is
> garbage memory. Your real problem is in exit1() or ttywakeup(). Since
> ttywakeup() doesn't call exit1() (AFAIK), the exit1() frame is probably
> bogus (gdb doesn't grok trapframes maybe?) and the real bug is a NULL
> pointer deref in ttywakeup(). Perhaps it's a bug in the ptc driver?
> (ptcopen is in the trace). What is the ptc driver anyway?
I think we have a race in -STABLE relating to tty wakeups and
open/close/device teardown. I've seen a panic relating to sio during a
tty close on RELENG_5 about 5-6 months ago, but was unable to get a dump.
Scott has since fixed dumps with twe, but I've not yet been able to get
the bug to recur. I'll give it another try.
Robert N M Watson
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