[3037] in testers
Re: 8.0F sun4m: portnoy panic in mutex_exit() called from afs_UFSWrite()
daemon@ATHENA.MIT.EDU (John Hawkinson)
Sat Jul 27 18:57:47 1996
Date: Sat, 27 Jul 1996 18:56:08 -0400
To: testers@MIT.EDU
Cc: sipb-staff@MIT.EDU
In-Reply-To: "[3036] in testers"
From: John Hawkinson <jhawk@MIT.EDU>
[cc list trimmed]
> It's possible that I'm just misunderstanding something obvious, or
> there maybe stack corruption, or there may be serious problem
> (?). I'd check it's value in the running kernel, but I don't know
> how to compute the offset of a symbol inside a loadable module
> ("modinfo|grep afs" and add the address within /kernel/fs/afs to the
> offset? How to find the address of afs_global_lock within
> /kernel/fs/afs? ??), and I didn't have the forsight to boot kadb
> after the crash.
The solution here is to *NOT* use
adb -k /kernel/unix /dev/mem
but instead use:
adb -k /dev/ksyms /dev/mem
/dev/ksyms is a character special file that provides an interface
for accessing symbols for the active kernel, both those from /kernel/unix,
and those from modloaded modules. The things you learn from reading
other people's bug reports in Sunsolve...
--jhawk
