From: Russell King <rmk@arm.linux.org.uk>
To: Shiyong Li <shi-yong.li@motorola.com>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: "slab: Fix missing DEBUG_SLAB last user" breaks ARM
Date: Mon, 7 Feb 2011 18:06:07 +0000 [thread overview]
Message-ID: <20110207180606.GB2966@flint.arm.linux.org.uk> (raw)
commit 5c5e3b33 appears to break ARM thusly:
| Mount-cache hash table entries: 512
| slab error in verify_redzone_free(): cache `idr_layer_cache': memory outside object was overwritten
| Backtrace:
| [<c0227088>] (dump_backtrace+0x0/0x110) from [<c0431afc>] (dump_stack+0x18/0x1c)
| [<c0431ae4>] (dump_stack+0x0/0x1c) from [<c0293304>] (__slab_error+0x28/0x30)
| [<c02932dc>] (__slab_error+0x0/0x30) from [<c0293a74>] (cache_free_debugcheck+0x1c0/0x2b8)
| [<c02938b4>] (cache_free_debugcheck+0x0/0x2b8) from [<c0293f78>] (kmem_cache_free+0x3c/0xc0)
| [<c0293f3c>] (kmem_cache_free+0x0/0xc0) from [<c032b1c8>] (ida_get_new_above+0x19c/0x1c0)
| [<c032b02c>] (ida_get_new_above+0x0/0x1c0) from [<c02af7ec>] (alloc_vfsmnt+0x54/0x144)
| [<c02af798>] (alloc_vfsmnt+0x0/0x144) from [<c0299830>] (vfs_kern_mount+0x30/0xec)
| [<c0299800>] (vfs_kern_mount+0x0/0xec) from [<c0299908>] (kern_mount_data+0x1c/0x20)
| [<c02998ec>] (kern_mount_data+0x0/0x20) from [<c02146c4>] (sysfs_init+0x68/0xc8)
| [<c021465c>] (sysfs_init+0x0/0xc8) from [<c02137d4>] (mnt_init+0x90/0x1b0)
| [<c0213744>] (mnt_init+0x0/0x1b0) from [<c0213388>] (vfs_caches_init+0x100/0x140)
| [<c0213288>] (vfs_caches_init+0x0/0x140) from [<c0208c0c>] (start_kernel+0x2e8/0x368)
| [<c0208924>] (start_kernel+0x0/0x368) from [<c0208034>] (__enable_mmu+0x0/0x2c)
| c0113268: redzone 1:0xd84156c5c032b3ac, redzone 2:0xd84156c5635688c0.
| slab error in cache_alloc_debugcheck_after(): cache `idr_layer_cache': double free, or memory outside object was overwritten
| ...
| c011307c: redzone 1:0x9f91102ffffffff, redzone 2:0x9f911029d74e35b
| slab: Internal list corruption detected in cache 'idr_layer_cache'(24), slabp c0113000(16). Hexdump:
|
| 000: 20 4f 10 c0 20 4f 10 c0 7c 00 00 00 7c 30 11 c0
| 010: 10 00 00 00 10 00 00 00 00 00 c9 17 fe ff ff ff
| 020: fe ff ff ff fe ff ff ff fe ff ff ff fe ff ff ff
| 030: fe ff ff ff fe ff ff ff fe ff ff ff fe ff ff ff
| 040: fe ff ff ff fe ff ff ff fe ff ff ff fe ff ff ff
| 050: fe ff ff ff fe ff ff ff fe ff ff ff 11 00 00 00
| 060: 12 00 00 00 13 00 00 00 14 00 00 00 15 00 00 00
| 070: 16 00 00 00 17 00 00 00 c0 88 56 63
| kernel BUG at /home/rmk/git/linux-2.6-rmk/mm/slab.c:2928!
This hasn't been noticed as I guess not many people use SLAB on ARM
anymore, and even less people probably have SLAB debugging enabled.
With SLAB debugging disabled, the system appears to behave correctly -
or maybe the problem is just hidden.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
next reply other threads:[~2011-02-07 18:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-07 18:06 Russell King [this message]
2011-02-08 5:44 ` "slab: Fix missing DEBUG_SLAB last user" breaks ARM Pekka Enberg
2011-02-08 12:55 ` Russell King
2011-02-08 15:02 ` Christoph Lameter
2011-02-11 7:02 ` Pekka Enberg
2011-02-11 9:14 ` Russell King
2011-02-11 15:20 ` Christoph Lameter
2011-02-11 15:35 ` Russell King
[not found] ` <AANLkTimDUf52xdHn22=f1J=Xn88sqPEg9P6+ceas1h1k@mail.gmail.com>
2011-02-14 15:40 ` Russell King
2011-02-14 15:43 ` Pekka Enberg
2011-02-14 18:07 ` Pekka Enberg
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