linux-ext4 - Re: BUG: scheduling while atomic: kswapd0/273/0x00000002

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Message-ID: <20081201173737.GC2506@balbir.in.ibm.com>
Date:	Mon, 1 Dec 2008 23:07:37 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: BUG: scheduling while atomic: kswapd0/273/0x00000002

* Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com> [2008-12-01 21:27:55]:

> On Mon, Dec 01, 2008 at 09:23:41PM +0530, Balbir Singh wrote:
> > * Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com> [2008-12-01 20:56:56]:
> > 
> > > Hi,
> > > 
> > > With the latest patch queue i am getting the below error
> > >
> > 
> > Did you enable jbd_debug enabled by any chance? 
> > 
> 
> No. The problem is we cannot call jbd2_log_wait_commit
> from blkdev_releasepage because jbd2_log_wait_commit
> does a wait_event 
> 
> 549                 spin_unlock(&journal->j_state_lock);
> 550                 wait_event(journal->j_wait_done_commit,
> 551                                 !tid_gt(tid, journal->j_commit_sequence));
> 552                 spin_lock(&journal->j_state_lock);
>

Yes, I should have seen the stack. The same problem seems to exist for
ext3 as well (with log_wait_commit). kswapd() passes GFP_KERNEL as
gfp_mask in scan_control and that confuses the journalling layer,
since we hold the lock on page in shrink_page_list().

-- 
	Balbir
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