Re: [Crash-utility] Crash on Linux 3.6 rc1
----- Original Message -----
I trip over this bug on Linux 3.6 rc1. Crash runs fine on Linux 3.5.
Thanks,
--Mark Tinguely.
------
~/xfs # crash System.map vmlinux
crash 6.0.8
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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
~/xfs # cat /proc/version
Linux version 3.6.0-rc1 (root@cxfsxe12) (gcc version 4.3.4
[gcc-4_3-branch revision 152973] (SUSE Linux) ) #1 SMP Fri Aug 10
17:03:36 CDT 2012
Mark,
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