linux-kernel - Re: linux-2.6.20-rc4-mm1 Reiser4 filesystem freeze and corruption

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Date:	Fri, 19 Jan 2007 21:53:33 +0300
From:	Edward Shishkin <edward@...esys.com>
To:	Zan Lynx <zlynx@....org>
CC:	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ReiserFS List <reiserfs-list@...esys.com>
Subject: Re: linux-2.6.20-rc4-mm1 Reiser4 filesystem freeze and corruption

Zan Lynx wrote:

>I have been running 2.6.20-rc2-mm1 without problems, but both rc3-mm1
>and rc4-mm1 have been giving me these freezes. 
>

I didn't investigate it in details yet, other file systems also freeze 
for me:
http://marc.theaimsgroup.com/?l=linux-kernel&m=116809282829254&w=2

> They were happening
>inside X and without external console it was impossible to get anything,
>plus I was reluctant to test it since the freeze sometimes requires a
>full fsck.reiser4 --build-fs to recover the filesystem.
>  
>

Why did you decide to recover? Got oops after mount, or?

>But I finally got some output in a console session.  I wasn't able to
>get it all, I made some notes of what I think the problem is.  I may try
>again later once I get netconsole working (netconsole fails as a
>built-in, I'll try it as a module next).
>
>1 lock held by pdflush/185:
>#0: (&type->s_umount_key#15) ... writeback_inodes+0x89
>
>3 locks held by realsync/12942:
>#0: (&type->s_umount_key#15) at ... __sync_inodes+0x78
>#1: (&mgr->commit_mutex) ... reiser4_txn_end+0x37a
>#2: (&qp->mutex) ... synchronize_qrcu+0x19
>
>So, I *think* the problem is two locks on s_umount_key#15.  Does that
>sound likely?  I also noticed QRCU may be involved.
>
>Perhaps someone will look at this and instantly know what the problem
>is.
>
>If not, I'll be following up with more details like .config and perhaps
>a full sysrq-T dump as soon as that fsck finishes.
>  
>

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