Date: Fri, 30 Jun 2006 15:10:23 GMT From: John Baldwin <jhb@freebsd.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/99094: panic: sleeping thread (Sleeping thread ... owns a non-sleepable lock) Message-ID: <200606301510.k5UFANKX066738@freefall.freebsd.org>
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The following reply was made to PR kern/99094; it has been noted by GNATS.
From: John Baldwin <jhb@freebsd.org>
To: Eirik =?iso-8859-1?q?=D8verby?= <ltning@anduin.net>
Cc: bug-followup@freebsd.org
Subject: Re: kern/99094: panic: sleeping thread (Sleeping thread ... owns a non-sleepable lock)
Date: Fri, 30 Jun 2006 11:06:47 -0400
On Friday 30 June 2006 10:56, Eirik =D8verby wrote:
> Hm, I thought I had that in my report?
=46rom the messages:
Sleeping thread (tid 100082, pid 84236) owns a non-sleepable lock
panic: sleeping thread
cpuid =3D 0
KDB: enter: panic
[thread pid 84235 tid 100474 ]
This means pid 84236 misbehaved, and pid 84235 found that it had misbehaved=
=2E =20
The sole stack trace is of pid 84235:
db> bt
Tracing pid 84235 tid 100474 td 0xffffff006f759000
^^^^^
:)
> I have to find a way to automate this. I've just moved the =20
> installation to a newly partitioned array, to make sure I have room =20
> for crash dumps, and I have the following in rc.conf:
>=20
> dumpdev=3D"AUTO"
> dumpdir=3D"/usr/crash"
>=20
> from my reading, that should be enough.
>=20
> In addition I added KDB_UNATTENDED to the kernel config, as I cannot =20
> risk that the box is down for hours before I have a chance to get to =20
> the debugger console every time. The question is: Will it actually do =20
> an automatic dump before rebooting, or will a dump *always* require =20
> manual intervention? And will a dump contain all necessary information?
You can get a stack trace from the dump using kgdb. You'll have to use 'in=
fo=20
threads' in gdb to find the thread with the corresponding pid, then use the=
=20
gdb 'thread' command to switch to that thread (using the gdb thread number,=
=20
not the tid or pid) and then do a 'bt' or 'where' to get the trace.
=2D-=20
John Baldwin
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