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Date: Mon, 18 Aug 2003 21:29:51 -0700
From: Andrew Morton <akpm@osdl.org>
To: "Randy.Dunlap" <rddunlap@osdl.org>
Cc: davej@redhat.com, mpm@selenic.com, linux-kernel@vger.kernel.org
Subject: Re: Debug: sleeping function called from invalid context
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"Randy.Dunlap" <rddunlap@osdl.org> wrote:
>
> Call Trace:
>   [<c0120d93>] __might_sleep+0x53/0x74
>   [<c010d001>] save_v86_state+0x71/0x1f0
>   [<c010dbd5>] handle_vm86_fault+0xc5/0xa90
>   [<c019cac8>] ext3_file_write+0x28/0xc0
>   [<c011cd96>] __change_page_attr+0x26/0x220
>   [<c010b310>] do_general_protection+0x0/0x90
>   [<c010a69d>] error_code+0x2d/0x40
>   [<c0109657>] syscall_call+0x7/0xb
> 
>  My (more) vague understanding is that X(?) got the kernel to
>  do_general_protection() somehow, but change_page_attr() does this:
>  	spin_lock_irqsave(&cpa_lock, flags);
>  in arch/i386/mm/pageattr.c (I'm on a UP box),
>  so irqs are disabled by the kernel and then we calls put_user()
>  with a spinlock held.

The __change_page_attr() there looks like stack gunk.

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