Hi Dave,
I found the problem that the crash utility fails during the initialization.
This problem happened on i386 linux-2.6.22 like the following:
$ crash vmlinux vmcore
crash 4.0-4.4
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Red Hat, Inc.
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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.
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GNU gdb 6.1
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
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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"...
crash: invalid size request: 0 type: "__per_cpu_offset"
$
The cause is that the array number of the symbol "__per_cpu_offset"
cannot be taken. In linux-2.6.21, i386's "__per_cpu_offset" is defined
in include/asm-generic/percpu.h like the following:
extern unsigned long __per_cpu_offset[NR_CPUS];
But in linux-2.6.22, it is defined in include/asm-i386/percpu.h like
the following, and the array number is not described in the debugging
information.
extern unsigned long __per_cpu_offset[];
Here is the patch for solving the problem. If the array number is not
taken, the crash utility assumes that it is the defined value NR_CPUS.
Or, should get_array_length() be fixed to get the array number from
init/main.c ?
Thanks
Ken'ichi Ohmichi
--- crash-4.0-4.4.org/kernel.c 2007-07-21 04:19:23.000000000 +0900
+++ crash-4.0-4.4/kernel.c 2007-07-24 19:51:55.000000000 +0900
@@ -170,7 +170,7 @@ kernel_init()
else
i = get_array_length("__per_cpu_offset", NULL, 0);
get_symbol_data("__per_cpu_offset",
- sizeof(long)*(i <= NR_CPUS ? i : NR_CPUS),
+ sizeof(long)*((i && (i <= NR_CPUS)) ? i : NR_CPUS),
&kt->__per_cpu_offset[0]);
kt->flags |= PER_CPU_OFF;
}
_
--
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