linux-kernel - Re: [RFC][PATCH 0/7] nested sleeps, fixes and debug infra

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Message-Id: <20140806.141603.1422005306896590750.davem@davemloft.net>
Date:	Wed, 06 Aug 2014 14:16:03 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	peterz@...radead.org
Cc:	ilya.dryomov@...tank.com, mingo@...nel.org, oleg@...hat.com,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	umgwanakikbuti@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 0/7] nested sleeps, fixes and debug infra

From: Peter Zijlstra <peterz@...radead.org>
Date: Wed, 6 Aug 2014 10:31:34 +0200

> On Wed, Aug 06, 2014 at 11:51:29AM +0400, Ilya Dryomov wrote:
> 
>> OK, this one is a bit different.
>> 
>> WARNING: CPU: 1 PID: 1744 at kernel/sched/core.c:7104 __might_sleep+0x58/0x90()
>> do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff81070e10>] prepare_to_wait+0x50 /0xa0
> 
>>  [<ffffffff8105bc38>] __might_sleep+0x58/0x90
>>  [<ffffffff8148c671>] lock_sock_nested+0x31/0xb0
>>  [<ffffffff81498aaa>] sk_stream_wait_memory+0x18a/0x2d0
> 
> Urgh, tedious. Its not an actual bug as is. Due to the condition check
> in sk_wait_event() we can call lock_sock() with ->state != TASK_RUNNING.
> 
> I'm not entirely sure what the cleanest way is to make this go away.
> Possibly something like so:

If you submit this formally to netdev with a signoff I'm willing to apply
this if it helps the debug infrastructure.
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