Date: Thu, 08 Mar 2001 09:57:10 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Andrea Campi <andrea@webcom.it> Cc: current@FreeBSD.org Subject: RE: Panic mounting msdos fs Message-ID: <XFMail.010308095710.jhb@FreeBSD.org> In-Reply-To: <20010308132714.A569@webcom.it>
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On 08-Mar-01 Andrea Campi wrote:
> Yesterday -current:
>
># mount /msdos
>
> Acquring duplicate lock of same type: "lockmgr interlock"
> 1st @ ../../kern/kern_lock.c:239
> 2nd @ ../../kern/kern_lock.c:239
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x0
> fault code = supervisor write, page not present
> instruction pointer = 0x8:0xc015c3f5
> stack pointer = 0x10:0xc7821ce4
> frame pointer = 0x10:0xc7821cf0
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 489 (mount_msdos)
> kernel: type 12 trap, code=0
> Stopped at witness_exit+0x23d: movl %eax,0(%edx)
> db>
(kgdb) l *(witness_exit+0x23d)
0xc0200e41 is in witness_exit (../../kern/kern_mutex.c:1303).
1300 if ((flags & MTX_NOSWITCH) == 0 && !mtx_legal2block() && !cold)
1301 panic("switchable mtx_unlock() of %s when not legal @
%s:%d",
1302 m->mtx_description, file, line);
1303 LIST_REMOVE(m, mtx_held);
1304 m->mtx_held.le_prev = NULL;
1305 }
Hmmmm. It dereferenced NULL in the LIST_REMOVE(). Did you get a dump by any
chance?
--
John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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