linux-kernel - Re: next-20090310: ext4 hangs

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Message-ID: <a4423d670903250829w5e9304a7rce24f4220379620f@mail.gmail.com>
Date:	Wed, 25 Mar 2009 18:29:10 +0300
From:	Alexander Beregalov <a.beregalov@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Theodore Tso <tytso@....edu>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: next-20090310: ext4 hangs

2009/3/25 Jan Kara <jack@...e.cz>:
> On Wed 25-03-09 18:18:43, Alexander Beregalov wrote:
>> 2009/3/25 Jan Kara <jack@...e.cz>:
>> >> > So, I think I need to try it on 2.6.29-rc7 again.
>> >>   I've looked into this. Obviously, what's happenning is that we delete
>> >> an inode and jbd2_journal_release_jbd_inode() finds inode is just under
>> >> writeout in transaction commit and thus it waits. But it gets never woken
>> >> up and because it has a handle from the transaction, every one eventually
>> >> blocks on waiting for a transaction to finish.
>> >>   But I don't really see how that can happen. The code is really
>> >> straightforward and everything happens under j_list_lock... Strange.
>> >  BTW: Is the system SMP?
>> No, it is UP system.
>  Even stranger. And do you have CONFIG_PREEMPT set?
>
>> The bug exists even in 2.6.29, I posted it with a new topic.
>  OK, I've sort-of expected this.

CONFIG_PREEMPT_RCU=y
CONFIG_PREEMPT_RCU_TRACE=y
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
CONFIG_PREEMPT=y
CONFIG_DEBUG_PREEMPT=y
# CONFIG_PREEMPT_TRACER is not set

config is attached.

Download attachment "sparc-config" of type "application/octet-stream" (25765 bytes)