linux-ext4 - Re: BUG: soft lockup - CPU#0 stuck for 11s! [fsstress:5534]

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Message-ID: <20071221105856.GA6989@skywalker>
Date:	Fri, 21 Dec 2007 16:28:56 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Cc:	Theodore Tso <tytso@....edu>, Andreas Dilger <adilger@....com>,
	Alex Tomas <bzzz@....com>
Subject: Re: BUG: soft lockup - CPU#0 stuck for 11s! [fsstress:5534]

On Thu, Dec 20, 2007 at 08:02:42PM +0530, Aneesh Kumar K.V wrote:
> I am seeing this with the patch queue. I can reproduce this on x86 and
> powerpc. I see the file system full when this happens. The same happens even
> without delalloc enabled.
> 
> 


The below patch fix the same for me. One thing i observed with the patch queue
is, enabling delalloc by default. Delalloc doesn't handle the file system full
case because there is no block reservation. Unless we have block reservation i
guess we should disable delalloc by default.

I will send a full patch with proper log message.

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 72e1920..8b45ac0 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3791,6 +3791,7 @@ repeat:
 	/* if we still need more blocks and some PAs were used, try again */
 	if (free < needed && busy) {
 		ext4_unlock_group(sb, group);
+		schedule_timeout(HZ);
 		goto repeat;
 	}
 
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