linux-kernel - Re: sysfs lockdep complaint

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Message-ID: <1266674291.18465.7.camel@jlt3.sipsolutions.net>
Date:	Sat, 20 Feb 2010 14:58:11 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: sysfs lockdep complaint

On Sat, 2010-02-20 at 21:51 +0800, Américo Wang wrote:

> >BUG: key c0000002165eb478 not in .data!
> >
> >instead of the lockdep complaint above.
> >
> 
> I am not surprised. :)
> 
> Please send us the backtraces you got, we could expect this.

I hacked in dump_stack() but it overflowed my log buffer, here's an example:

[   31.625411] BUG: key c0000002134f2ab0 not in .data!
[   31.625414] Call Trace:
[   31.625417] [c000000213b677c0] [c000000000012c1c] .show_stack+0xc0/0x200 (unreliable)
[   31.625423] [c000000213b67890] [c0000000005ac968] .dump_stack+0x28/0x3c
[   31.625428] [c000000213b67910] [c0000000000b6a3c] .lockdep_init_map+0x11c/0x674
[   31.625433] [c000000213b67a10] [c0000000001efd90] .sysfs_add_file_mode+0x90/0x124
[   31.625438] [c000000213b67ad0] [c0000000001efe60] .sysfs_add_file+0x3c/0x50
[   31.625442] [c000000213b67b70] [c0000000001f2f40] .sysfs_create_bin_file+0x5c/0x78
[   31.625448] [c000000213b67c10] [c0000000000cd0b0] .load_module+0x16a4/0x197c
[   31.625452] [c000000213b67d80] [c0000000000cd424] .SyS_init_module+0x9c/0x2d4
[   31.625457] [c000000213b67e30] [c0000000000075d4] syscall_exit+0x0/0x40

There's also
[   34.776604] BUG: key c000000216265388 not in .data!
[   34.776606] Call Trace:
[   34.776609] [c000000213b5f7a0] [c000000000012c1c] .show_stack+0xc0/0x200 (unreliable)
[   34.776615] [c000000213b5f870] [c0000000005ac968] .dump_stack+0x28/0x3c
[   34.776620] [c000000213b5f8f0] [c0000000000b6a3c] .lockdep_init_map+0x11c/0x674
[   34.776624] [c000000213b5f9f0] [c0000000001efd90] .sysfs_add_file_mode+0x90/0x124
[   34.776629] [c000000213b5fab0] [c0000000001f32b4] .internal_create_group+0x168/0x24c
[   34.776634] [c000000213b5fb70] [c0000000001f3420] .sysfs_create_group+0x38/0x50
[   34.776639] [c000000213b5fc10] [c0000000000ccf20] .load_module+0x1514/0x197c
[   34.776644] [c000000213b5fd80] [c0000000000cd424] .SyS_init_module+0x9c/0x2d4
[   34.776649] [c000000213b5fe30] [c0000000000075d4] syscall_exit+0x0/0x40

and many many times...

Let me recompile with that dump_stack() removed.

johannes

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