From: Andy Whitcroft <apw@shadowen.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.21-mm2 -- compat_core_sys_select() kmalloc(0)
Date: Thu, 10 May 2007 12:29:16 +0100 [thread overview]
Message-ID: <4643020C.1010307@shadowen.org> (raw)
In-Reply-To: <20070509012322.199f292b.akpm@linux-foundation.org>
Seems that compat_core_sys_select() is using kmalloc(0) and SLUB is
picking up on it. Occuring on an older x86_64 numa system.
BUG: at include/linux/slub_def.h:88 kmalloc_index()
Call Trace:
[<ffffffff80270392>] get_slab+0x50/0x1f7
[<ffffffff802706d0>] __kmalloc+0xf/0x6d
[<ffffffff802a0421>] compat_core_sys_select+0x7e/0x1d8
[<ffffffff802a061d>] compat_sys_select+0xa2/0x131
[<ffffffff8021acb2>] ia32_sysret+0x0/0xa
This appears to occur when a 32 bit app uses select(0, ...) as a
timeout. I think its safe as it is, in that we'll never touch the
pointers if n==0 but more eyes would help. It might be clearer to
special case the n==0 case to avoid all this.
-apw
next prev parent reply other threads:[~2007-05-10 11:29 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-09 8:23 2.6.21-mm2 Andrew Morton
2007-05-09 14:57 ` 2.6.21-mm2 - Kconfig horkage Valdis.Kletnieks
2007-05-09 17:07 ` Christoph Lameter
2007-05-09 17:16 ` Valdis.Kletnieks
2007-05-09 18:36 ` Christoph Lameter
2007-05-09 16:08 ` 2.6.21-mm2 - 100% CPU on ksoftirqd/1 Valdis.Kletnieks
2007-05-09 17:31 ` Andrew Morton
2007-05-09 18:12 ` Jeremy Fitzhardinge
2007-05-09 20:13 ` Valdis.Kletnieks
2007-05-11 2:52 ` Valdis.Kletnieks
2007-05-09 16:51 ` 2.6.21-mm2 - hanging with initcall_debug and netconsole Valdis.Kletnieks
2007-05-09 17:37 ` Andrew Morton
2007-05-10 11:29 ` Andy Whitcroft [this message]
2007-05-10 11:48 ` 2.6.21-mm2 -- powerpc missing kset Andy Whitcroft
2007-05-10 11:48 ` Andy Whitcroft
2007-05-10 12:16 ` Stephen Rothwell
2007-05-10 12:16 ` Stephen Rothwell
2007-05-10 15:48 ` Randy Dunlap
2007-05-10 15:48 ` Randy Dunlap
2007-05-10 23:45 ` Stephen Rothwell
2007-05-10 12:21 ` ixp4xx compile error (was Re: 2.6.21-mm2) Frederik Deweerdt
2007-05-10 12:45 ` Frederik Deweerdt
2007-05-10 12:56 ` Dmitry Torokhov
2007-05-10 16:11 ` 2.6.21-mm2 Marc Dietrich
2007-05-10 19:22 ` 2.6.21-mm2 Andrew Morton
2007-05-10 20:40 ` 2.6.21-mm2 Marc Dietrich
2007-05-11 8:27 ` [-mm patch] make csum_and_copy_from_user arch independent (was Re: 2.6.21-mm2) Frederik Deweerdt
2007-05-11 8:33 ` Andrew Morton
2007-05-11 9:14 ` [-mm patch] make csum_and_copy_from_user arch independent David Miller
2007-05-11 13:56 ` Frederik Deweerdt
2007-05-11 17:04 ` Russell King
2007-05-11 18:03 ` 2.6.21-mm2 boot failure, raid autodetect, bd_set_size+0xb/0x80 thunder7
2007-05-11 18:18 ` Andrew Morton
2007-05-11 18:53 ` thunder7
2007-05-15 3:25 ` 2.6.21-mm2 - CONFIG_STATISTIC and Intel PowerTOP Valdis.Kletnieks
2007-05-15 14:25 ` Martin Peschke
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