Re: kernel panic, problems getting backtrace from saved core

[buhrow%lothlorien.nfbcal.org@localhost (Brian Buhrow)]

        hello.  Can you get ps output from the  core file? 
i.e. 
ps -lax -o laddr -N netbsd.1 -M netbsd.1.core?
Then, you can try setting the proc in gdb to the laddr of each process and
see if you can get a good back trace there.  I've found that works quite
well.
Unfortunately, I don't remember the exact proc command in gdb, but it's in
the debugging howto on the netbsd.org site.
-Brian

On Oct 3, 10:24pm, Thomas Klausner wrote:
} Subject: kernel panic, problems getting backtrace from saved core
} Hi!
} 
} 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
} # gdb /netbsd.6.99.11b
} GNU gdb (GDB) 7.3.1
} Copyright (C) 2011 Free Software Foundation, Inc.
} License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
} This is free software: you are free to change and redistribute it.
} There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
} and "show warranty" for details.
} This GDB was configured as "x86_64--netbsd".
} For bug reporting instructions, please see:
} <http://www.gnu.org/software/gdb/bugs/>...
} Reading symbols from /netbsd.6.99.11b...(no debugging symbols found)...done.
} (gdb) target kvm core
} #0  0x0000000000000000 in ?? ()
} (gdb) bt
} #0  0x0000000000000000 in ?? ()
} #1  0x0000000000000000 in ?? ()
} (gdb) quit
} # gdb  kernel
} GNU gdb (GDB) 7.3.1
} Copyright (C) 2011 Free Software Foundation, Inc.
} License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
} This is free software: you are free to change and redistribute it.
} There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
} and "show warranty" for details.
} This GDB was configured as "x86_64--netbsd".
} For bug reporting instructions, please see:
} <http://www.gnu.org/software/gdb/bugs/>...
} Reading symbols from /path/to/kernel...(no debugging symbols found)...done.
} (gdb) target kvm core
} #0  <unavailable> in ?? ()
} (gdb) bt
} #0  <unavailable> in ?? ()
} Backtrace stopped: Not enough registers or memory available to unwind further
} (gdb) quit
} 
} Suggestions?
}  Thomas
>-- End of excerpt from Thomas Klausner