Date: Wed, 27 Nov 2002 21:01:53 +0100
From: Rasmus Andersen <rasmus@jaquet.dk>
To: Andrew Morton <akpm@digeo.com>
Cc: lkml <linux-kernel@vger.kernel.org>, linux-mm@kvack.org
Subject: Re: 2.5.49-mm2
Message-ID: <20021127210153.A8411@jaquet.dk>
References: <3DE48C4A.98979F0C@digeo.com>
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In-Reply-To: <3DE48C4A.98979F0C@digeo.com>; from akpm@digeo.com on Wed, Nov 27, 2002 at 01:11:38AM -0800
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On Wed, Nov 27, 2002 at 01:11:38AM -0800, Andrew Morton wrote:
>=20
> url: http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.49/2.5.49-mm2/

I'm fairly sure this is not specific to -mm2 since it looks
at lot like my problem from plain 2.5.49
(http://marc.theaimsgroup.com/?l=3Dlinux-kernel&m=3D103805691602076&w=3D2)
but -mm2 gave me some usable debug output:

Debug: Sleeping function called from illegal context at include/
linux/rwsem.h:66
Call Trace: __might_sleep+0x54/0x58
           sys_mprotect+0x97/0x22b
           syscall_call+0x7/0xb

Unable to handle kernel paging request at virtual address 4001360c

(I did not copy the rest but can reproduce at will.)

AFAICS, the fingered function is down_write at mprotect.c:262
but I fail to see why it is in a illegal context...

Hope this is useful for somebody. I am willing to test patches.

Regards,
  Rasmus

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