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Message-ID: <a781481a0706260125l76c5848aq85403a4ec94d57da@mail.gmail.com>
Date: Tue, 26 Jun 2007 13:55:01 +0530
From: "Satyam Sharma" <satyam.sharma@gmail.com>
To: gshan <gshan@alcatel-lucent.com>
Subject: Re: bugs in __schedule()
Cc: linux-kernel@vger.kernel.org
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Hi Gavin,

On 6/26/07, gshan <gshan@alcatel-lucent.com> wrote:
> Here is the all output I have:
>
> # ifconfig mgt0 10.0.51.27
> BUG: scheduling while atomic: exe/0x00000101/752

Yup, you can't sleep in taskets, they're atomic.

> caller is schedule+0x4c/0xe4
> Call trace:
>  [c02dc4dc] __schedule+0x654/0x788
>  [c02dc6f4] schedule+0x4c/0xe4
>  [c02dbe24] __compat_down+0xc8/0x12c

So, you can't use / acquire semaphores in them. Use spinlocks.
If the shared data is also accessed from process context, use
spin_lock_bh() from the process context code.

Satyam
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