Re: kernel panic, problems getting backtrace from saved core

[Thomas Klausner <wiz%NetBSD.org@localhost>]

On Thu, Oct 04, 2012 at 09:03:26AM +0100, Stephen Borrill wrote:
> On Wed, 3 Oct 2012, Thomas Klausner wrote:
> >About two weeks ago I had a kernel panic.
> >
> >Sep 15 00:49:31 yt savecore: warning: /dev/ksyms version mismatch:      
> >NetBSD 6.99.11 (YT) #23: Tue Sep 11 23:23:01 CEST 2012  
> >wiz%yt.nih.at@localhost:/archive/cvs/src/sys/arch/amd64/compile/obj/YT  and  
> >     C
> >Sep 15 00:49:31 yt savecore: reboot after panic: .tn_readdir_lastp == NULL 
> >|| tmpfs_dircookie((node)->tn_spAecN.ItNnG_:d iSrP.Lt nN_rOeTa 
> >dLdOiWrE_RlEaDs OtNp )S Y=S=C A(LnLo de)-1>0t6n _4s pEeXcI.Tt n_d1i8rf.t0n 
> >_r6e addir_lastn" failed: file "/archive/cvs/src/sys/fs/tmpfs/tmpfs.h", line 
> >357  cpu6: Begin traceback... WARNING: SPL NOT LOWERE
> >Sep 15 00:49:31 yt savecore: system went down at Fri Sep 14 13:26:33 2012
> >Sep 15 00:49:32 yt savecore: writing compressed core to 
> >/var/crash/netbsd.1.core.gz
> >
> >Today I wanted to look at the backtrace, but couldn't.
> ># gzcat /var/crash/netbsd.1.core.gz > core
> ># gzcat /var/crash/netbsd.1.gz > kernel
> ># ls -l
> >total 12577920
> >-rw-rw-r--  1 wiz  wheel  12875588120 Oct  3 22:12 core
> >-rw-r--r--  1 wiz  wheel       961748 Oct  3 22:12 kernel
> 
> This kernel can't be right for amd64.

I noticed that it's quite small, but
a) gzip -tv reports no error, and
b) I've also tried gdb against /netbsd.6.99.11b, which I think is the
kernel I was running at the time, with no better luck.

 Thomas