Date: Tue, 28 Nov 2000 12:43:11 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Andrea Campi <andrea@webcom.it> Cc: freebsd-current@FreeBSD.org Subject: RE: Panic in -current Message-ID: <XFMail.001128124311.jhb@FreeBSD.org> In-Reply-To: <20001128094457.A345@webcom.it>
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On 28-Nov-00 Andrea Campi wrote:
> Latest (this night) current, no system activity:
>
> panic: mutex Giant owned at ../../kern/kern_intr.c:238
>
> I can sen you kernel conf if needed.
>
> Is this known or should I invest some time to debug it?
Eek! I haven't seen this. If you can reproduce this, stick DDB, WITNESS, and
MUTEX_DEBUG in your kernel. Then when you get to the ddb prompt, do a
'x __mtx_debug_Giant' followed by 'x/x,8 __mtx_debug_Giant' (to work around
weird bugs in ddb). The last commad is a dump of Giant's mtx_debug structure:
struct mtx_debug {
struct witness *mtxd_witness;
LIST_ENTRY(mtx) mtxd_held;
const char *mtxd_file;
int mtxd_line;
const char *mtxd_description;
};
We want mtxd_file and mtxd_line. If you look at the output of the last
command, it will probably look something like this:
db> x/x,8 __mtx_debug_Giant
__mtx_debug_Giant: c03303d8 0 cb6475ac c02fdd2a
__mtx_debug_Giant+0x10: da c02f97ad 0 0
The last number of the first line is the address of the string holding the
filename:
db> x/s 0xc02fdd2a
__set_sysinit_set_sym...: ../../i386/isa/ithread.c
The first number on the second line is the line number:
db> x/d __mtx_debug_Giant+0x10
__mtx_debug_Giant+0x10: 218
So in this case Giant was last acquired at line 218 of ../../i386/isa/ithread.c.
Finding out where Giant was last obtained will help with finding out where it
was supposed to be dropped but wasn't.
> Bye,
> Andrea
--
John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
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