linux-ext4 - Re: [Bug 12579] ext4 filesystem hang

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Date:	Thu, 12 Feb 2009 12:49:08 -0500
From:	Theodore Tso <tytso@....edu>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	bugme-daemon@...zilla.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [Bug 12579] ext4 filesystem hang


>> Finally had some time, and I've tracked this down to the
>> page-writeback.c changes since .28 - backing them all out the
>> testcase runs overnight.  Still working out which one and why.  I
>> suppose it's still possible it's an ext4 bug but if so the
>> page-writeback.c changes exposed it.
>> 
>> It's a classic deadlock; I usually have 2 threads stuck, pdflush
>> vs. the livecd creator doing an fsync.  Each is waiting for a page
>> the other has locked.
>
> Two commits which are already in the mainline which fixed some changes
> after .28 are
> 
> 89e1219004b3657cc014521663eeef0744f1c99d
> dcf6a79dda5cc2a2bec183e50d829030c0972aaa
> 

I read Eric's email as saying he tracked it down to the
page-writeback.c changes *after* 2.6.28.  Eric, is that what you
meant?

	    	      	       	    	     - Ted
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