linux-kernel - Re: linux-next ppc64: RCU mods cause __might

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Message-ID: <1335832418.20866.95.camel@pasglop>
Date:	Tue, 01 May 2012 10:33:38 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: linux-next ppc64: RCU mods cause __might_sleep BUGs

On Mon, 2012-04-30 at 15:37 -0700, Hugh Dickins wrote:
> 
> BUG: sleeping function called from invalid context at include/linux/pagemap.h:354
> in_atomic(): 0, irqs_disabled(): 0, pid: 6886, name: cc1

Hrm ... in_atomic and irqs_disabled are both 0 ... so yeah it smells
like a preempt count problem... odd.

Did you get a specific bisect target yet ?

Cheers,
Ben.

> Call Trace:
> [c0000001a99f78e0] [c00000000000f34c] .show_stack+0x6c/0x16c (unreliable)
> [c0000001a99f7990] [c000000000077b40] .__might_sleep+0x11c/0x134
> [c0000001a99f7a10] [c0000000000c6228] .filemap_fault+0x1fc/0x494
> [c0000001a99f7af0] [c0000000000e7c9c] .__do_fault+0x120/0x684
> [c0000001a99f7c00] [c000000000025790] .do_page_fault+0x458/0x664
> [c0000001a99f7e30] [c000000000005868] handle_page_fault+0x10/0x30
> 
> I've plenty more examples, most of them from page faults or from kswapd;
> but I don't think there's any more useful information in them.
> 
> Anything I can try later on? 

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