linux-kernel - Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY

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Message-ID: <20150818053308.GA3629@brouette>
Date:	Tue, 18 Aug 2015 07:33:08 +0200
From:	Damien Wyart <damien.wyart@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Jan Kara <jack@...e.cz>, Jens Axboe <axboe@...nel.dk>,
	Eryu Guan <eguan@...hat.com>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, axboe@...com, Jan Kara <jack@...e.com>,
	linux-fsdevel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH block/for-linus] writeback: fix syncing of I_DIRTY_TIME
 inodes

> > I had an unstable system when running latest Linus tree with Tejun's
> > patch applied on top. Nothing fishy in the logs after rebooting without
> > the patch, but remote access with ssh when patch applied did not work
> > (as if /home partition could not be read). This system has / as ext4 and
> > other partitions (including /home) as XFS. Trying to login on tty
> > instead of X resulted in hang of X. I could reboot with sysrq, but can't
> > do further tests at the moment.

> > Back to same tree without the patch resulted in normal system.
> > So just a heads up the patch doesn't seem OK in its current state.

Hi Tejun,

> Have you been able to reproduce the failure? That sounds like an
> unlikely failure mode for the patch.

Unfortunately (as it would be nice to understand what happened), no.
I reapplied the patch on top of rc7 and could not reproduce the
unstability after several reboots.

I will continue running with the patch and report if anything strange
appears again...

-- 
Damien
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