linux-kernel - Re: [PATCH V2 2/2] fs/super.c: don't fool lockdep in freeze_super() and thaw

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Date:   Tue, 4 Oct 2016 18:58:27 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Dave Chinner <david@...morbit.com>
Cc:     Jan Kara <jack@...e.cz>, Al Viro <viro@...iv.linux.org.uk>,
        Nikolay Borisov <kernel@...p.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        fstests@...r.kernel.org
Subject: Re: [PATCH V2 2/2] fs/super.c: don't fool lockdep in freeze_super()
 and thaw_super() paths

On 10/04, Oleg Nesterov wrote:
>
> This time it hangs after generic/274:
>
> 	--- tests/generic/274.out	2016-10-04 04:23:24.209006171 -0400
> 	+++ /root/XFS/xfstests-dev/results//generic/274.out.bad	2016-10-04 05:17:49.291742498 -0400
> 	@@ -3,3 +3,4 @@
> 	preallocation test
> 	------------------------------
> 	done
> 	+./common/rc: line 344:  4693 Segmentation fault      exit
> 	...
> 	(Run 'diff -u tests/generic/274.out /root/XFS/xfstests-dev/results//generic/274.out.bad'  to see the entire diff)
>
> because of kernel bug:
>
> 	[ 2730.242537] run fstests generic/274 at 2016-10-04 05:17:34
> 	[ 2730.738352] XFS (loop1): Mounting V5 Filesystem
> 	[ 2730.741451] XFS (loop1): Ending clean mount
> 	[ 2744.508698] ------------[ cut here ]------------
> 	[ 2744.509190] kernel BUG at ./include/linux/swap.h:276!

I removed this test and then the next run (after reboot) hangs at xfs/073 with
a lot of errors in dmesg like

	XFS (loop2): Failing async write on buffer block 0x9600790. Retrying async write.
	blk_update_request: I/O error, dev loop2, sector 8389920
	loop: Write error at byte offset 4295647232, length 4096.

Oleg.