linux-kernel - Re: bugs in _

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Message-ID: <4680D007.3040007@alcatel-lucent.com>
Date:	Tue, 26 Jun 2007 16:36:23 +0800
From:	gshan <gshan@...atel-lucent.com>
To:	Satyam Sharma <satyam.sharma@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: bugs in __schedule()

Satyam Sharma wrote:
> Hi Gavin,
>
> On 6/26/07, gshan <gshan@...atel-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
Thanks, Satyam. So I can replace the tasklet with kernel thread?
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