netdev - Re: 2.6.27-05178-g2e532d6: list

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Date:	Sat, 18 Oct 2008 10:41:02 +0400
From:	"Alexander Beregalov" <a.beregalov@...il.com>
To:	"Davide Libenzi" <davidel@...ilserver.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Kernel Testers List" <kernel-testers@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: 2.6.27-05178-g2e532d6: list_add corruption

> This is very likely to be caused by a patch that went in a few days ago.
> Already posted a fix to Andrew.
>

Is it the same problem? 2.6.27-05577-g0cfd810

BUG eventpoll_epi: Poison overwritten
-----------------------------------------------------------------------------
INFO: 0xf2ac768c-0xf2ac7693. First byte 0xc instead of 0x6b
INFO: Allocated in sys_epoll_ctl+0x120/0x405 age=21753 cpu=0 pid=1936
INFO: Freed in ep_remove+0x7f/0x86 age=3964 cpu=0 pid=1936
INFO: Slab 0xc16568e0 objects=32 used=29 fp=0xf2ac7680 flags=0x400000c3
INFO: Object 0xf2ac7680 @offset=1664 fp=0xf2ac7f80

Bytes b4 0xf2ac7670:  5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a
ZZZZZZZZZZZZZZZZ
  Object 0xf2ac7680:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 0c 7d b1 f2
kkkkkkkkkkkk.}╠Р
  Object 0xf2ac7690:  0c 15 a7 f2 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
..╖Рkkkkkkkkkkkk
  Object 0xf2ac76a0:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
  Object 0xf2ac76b0:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
kkkkkkkkkkkkkkkk
  Object 0xf2ac76c0:  6b 6b 6b a5                                     kkk╔
 Redzone 0xf2ac76c4:  bb bb bb bb                                     ╩╩╩╩
 Padding 0xf2ac76ec:  5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a
ZZZZZZZZZZZZZZZZ
 Padding 0xf2ac76fc:  5a 5a 5a 5a                                     ZZZZ
Pid: 1936, comm: rtorrent Not tainted 2.6.27-05577-g0cfd810 #1
Call Trace:
 [<c0161628>] print_trailer+0xe1/0xe9
 [<c01616b1>] check_bytes_and_report+0x81/0xa4
 [<c01617a9>] check_object+0xa5/0x160
 [<c0162ceb>] __slab_alloc+0x420/0x4c7
 [<c0138d45>] ? trace_hardirqs_on+0xb/0xd
 [<c01630d4>] kmem_cache_alloc+0x62/0xaf
 [<c0187485>] ? sys_epoll_ctl+0x120/0x405
 [<c0187485>] ? sys_epoll_ctl+0x120/0x405
 [<c0187485>] sys_epoll_ctl+0x120/0x405
 [<c025d720>] ? trace_hardirqs_on_thunk+0xc/0x10
 [<c0102ea9>] sysenter_do_call+0x12/0x35
FIX eventpoll_epi: Restoring 0xf2ac768c-0xf2ac7693=0x6b

FIX eventpoll_epi: Marking all objects used