On 08/13/12 13:56, Dave Anderson wrote:
----- Original Message -----
I trip over this bug on Linux 3.6 rc1. Crash runs fine on Linux 3.5.
...
crash: invalid structure member offset: kmem_cache_s_next
FILE: memory.c LINE: 7945 FUNCTION: kmem_cache_init()
[/usr/bin/crash] error trace: 468317 => 49dbb2 => 487f28 => 5083da
5083da: OFFSET_verify+202
487f28: kmem_cache_init+312
49dbb2: vm_init+5794
468317: main_loop+215
...
It's this part of commit 3b0efdfa1e719303536c04d9abca43abeb40f80a
that changed the kmem_cache.next member from "next" to "list":
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index fbd1117..1d93f27 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -27,7 +27,7 @@ struct kmem_cache {
unsigned int limit;
unsigned int shared;
- unsigned int buffer_size;
+ unsigned int size;
u32 reciprocal_buffer_size;
/* 2) touched by every alloc& free from the backend */
@@ -52,7 +52,10 @@ struct kmem_cache {
/* 4) cache creation/removal */
const char *name;
- struct list_head next;
+ struct list_head list;
+ int refcount;
+ int object_size;
+ int align;
/* 5) statistics */
#ifdef CONFIG_DEBUG_SLAB
I'm curious whether if you change line 505 in memory.c:
502 } else {
503 STRUCT_SIZE_INIT(kmem_cache_s, "kmem_cache");
504 MEMBER_OFFSET_INIT(kmem_cache_s_num, "kmem_cache", "num");
505 =====> MEMBER_OFFSET_INIT(kmem_cache_s_next, "kmem_cache", "next");
506 MEMBER_OFFSET_INIT(kmem_cache_s_name, "kmem_cache", "name");
507 MEMBER_OFFSET_INIT(kmem_cache_s_colour_off, "kmem_cache",
508 "colour_off");
to this:
MEMBER_OFFSET_INIT(kmem_cache_s_next, "kmem_cache", "list");
that it might work?
Worse case, you can work around it by using the "--no_kmem_cache" option
on the crash command line.
Thanks,
Dave
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The error changed to:
~/xfs # crash System.map vmlinux
crash 6.0.8
Copyright (C) 2002-2012 Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation
Copyright (C) 1999-2006 Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited
Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011 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 (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-unknown-linux-gnu"...
crash: cannot resolve: "cache_chain"
--Mark.
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