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Date: Wed, 20 Aug 2003 13:03:47 -0500
From: Matt Mackall <mpm@selenic.com>
To: "Hmamouche, Youssef" <youssef@ece.utexas.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: sleeping function called from invalid context include/linux/rwsem.h:43
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References: <Pine.LNX.4.21.0308200117220.1817-100000@linux08.ece.utexas.edu>
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On Wed, Aug 20, 2003 at 01:38:09AM -0500, Hmamouche, Youssef wrote:
> 
> Hi,
> 
> I get this debug message right before the oops(Oops linux-2.6.0-test3
> sound) that I sent earlier to the list. When this Debug message happens
> before the oops, the system freezes. All of this is related to the
> Maestro3.c sound card. I've ran 2.4{16, 20, 21, 22-pre8} without a
> problem. I searched through the list archive for a similar problem, in
> vain. Can someone please tell what's causing this?  

Could you post the oops together with the might_sleep trace? This is
something calling down_read in a context where its not safe to sleep.
The rest of the backtrace doesn't make much sense..

Did you build with preempt enabled?

> 
> Thanks 
> 
>  Debug: sleeping function called from invalid context at
> include/linux/rwsem.h:43
> Aug 19 23:59:34 darkstar kernel: Debug: sleeping function called from
> invalid context at include/linux/rwsem.h:43
> 
> Call Trace:
>  [<c012722e>] __might_sleep+0x5e/0x70
>  [<c0127b20>] autoremove_wake_function+0x0/0x50
>  [<c0122869>] do_page_fault+0x79/0x4dc
>  [<c01c71ad>] ext2_get_inode+0xdd/0x140
>  [<c022973c>] avc_has_perm+0x6c/0x7b
>  [<c01227f0>] do_page_fault+0x0/0x4dc
>  [<c010b1b9>] error_code+0x2d/0x38
>  [<c03dabe1>] m3_open+0x131/0x390
>  [<c0159b94>] check_poison_obj+0x54/0x1d0
>  [<c03d4d25>] soundcore_open+0x1e5/0x4e0
>  [<c0186c90>] exact_match+0x0/0x10
>  [<c0186696>] chrdev_open+0x156/0x3e0
>  [<c017a388>] get_empty_filp+0x98/0x100
>  [<c017823c>] dentry_open+0x12c/0x1c0
>  [<c0178106>] filp_open+0x66/0x70
>  [<c0178855>] sys_open+0x55/0x90
>  [<c010b00f>] syscall_call+0x7/0xb
> 
> 
> -
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-- 
Matt Mackall : http://www.selenic.com : of or relating to the moon