Re: Problem opening core file.

[Rohit Persai <rpersai@xxxxxxxxxx>]

Dave Anderson wrote:
> Rohit Persai wrote:
> > Greetings,
> >
> > I am trying to open a core file but getting following error. I am 
> > sure that I am using right kernel + kernel-debuginfo package. As 
> > following command on crash log shows version on kernel in use.
> > # cat crash-log | grep -i 2.4.21
> > EIP is at check_pgt_cache [kernel] 0x19 (2.4.21-47.ELsmp)
> >
> > ----------------------------------------snip-from-system-on-which-i-am-opening-core-file----------------------------------------- 
> >
> > # uname -r
> > 2.4.21-47.ELsmp
> >
> > # crash /usr/lib/debug/boot/vmlinux-2.4.21-47.ELsmp.debug 
> > /boot/vmlinux-2.4.21-47.ELsmp case_1843132_vmcore
> >
> > crash 4.0-6.3
> > Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008  Red Hat, Inc.
> > Copyright (C) 2004, 2005, 2006  IBM Corporation
> > Copyright (C) 1999-2006  Hewlett-Packard Co
> > Copyright (C) 2005, 2006  Fujitsu Limited
> > Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
> > Copyright (C) 2005  NEC Corporation
> > Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
> > Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
> > This program is free software, covered by the GNU General Public 
> > License,
> > and you are welcome to change it and/or distribute copies of it under
> > certain conditions.  Enter "help copying" to see the conditions.
> > This program has absolutely no warranty.  Enter "help warranty" for 
> > details.
> >
> > GNU gdb 6.1
> > Copyright 2004 Free Software Foundation, Inc.
> > GDB is free software, covered by the GNU General Public License, and 
> > you are
> > welcome to change it and/or distribute copies of it under certain 
> > conditions.
> > Type "show copying" to see the conditions.
> > There is absolutely no warranty for GDB.  Type "show warranty" for 
> > details.
> > This GDB was configured as "i686-pc-linux-gnu"...
> >
> > WARNING: invalid value: smp_num_cpus: -1070037996
> > crash: /usr/lib/debug/boot/vmlinux-2.4.21-47.ELsmp.debug and 
> > case_1843132_vmcore do not match!
> >
> > Usage:
> >  crash [-h [opt]][-v][-s][-i file][-d num] [-S] [mapfile] [namelist] 
> > [dumpfile]
> >
> > Enter "crash -h" for details.
> > ----------------------------------------snip-from-system-on-which-i-am-opening-core-file----------------------------------------- 
> >
> >
> > Question: Why am I getting following message if I am using right set 
> > of packages.
> > crash: /usr/lib/debug/boot/vmlinux-2.4.21-47.ELsmp.debug and 
> > case_1843132_vmcore do not match!
> >
> > Any help would be greatly appreciated.
> > Rohit.
>
> Sorry for the delay -- I'm back from a 2-week break...
>
> Perhaps you've already resolved this issue, but if not, it does
> appear that you're doing everything correctly.  But when the
> value for "smp_num_cpus" was read from the vmcore, it's reading
> an integer value of -1070037996 (c0388414).  Since that's
> clearly nonsensical, it makes no sense continuing.
>
> Since RHEL3 used that brain-dead split vmlinux/vmlinux.debug
> format, you'd get a "CRC value does not match" error message
> if those two files weren't in sync.  And if the host machine
> and the vmlinux/vmlinux.debug/vmcore triplet weren't the same
> architecture, you'd get a  "machine type mismatch" error message.
>
> The only other thing I can suggest is to do this:
>
>   # strings /boot/vmlinux-2.4.21-47.ELsmp | grep "Linux version"
>   ...
>   # strings case_1843132_vmcore | grep "Linux version"
>   ...
>
> and make sure the strings match exactly -- including the
> build dates.
>
> It would be easy to say "it must be a corrupt vmcore", so
> I won't.  But's about as much help as I can come up with.
>
> Dave
>
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Thank you very much for replying. Actully I was using wrong debuginfo 
package for opening the core file. One of my peer (Nitin Bansal) helped 
me figure out.

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