From: Jan Kara <jack@suse.cz>
Subject: Re: Call trace in ext4_es_lru_add on 3.10 stable
Date: Thu, 4 Dec 2014 19:35:39 +0100
Message-ID: <20141204183539.GB23273@quack.suse.cz>
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Cc: Jan Kara <jack@suse.cz>, Theodore Ts'o <tytso@mit.edu>,
	linux-ext4@vger.kernel.org,
	"p.herz@profihost.ag >> Philipp Herz - Profihost AG"
	<p.herz@profihost.ag>, stable@vger.kernel.org,
	Zheng Liu <wenqing.lz@taobao.com>
To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
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On Thu 04-12-14 16:06:40, Stefan Priebe - Profihost AG wrote:
> 
> Am 26.11.2014 um 21:26 schrieb Jan Kara:
> > On Wed 26-11-14 16:11:37, Stefan Priebe - Profihost AG wrote:
> >> Am 26.11.2014 um 09:25 schrieb Jan Kara:
> >>>   Hi,
> >>>
> >>> On Wed 26-11-14 09:06:43, Stefan Priebe - Profihost AG wrote:
> >>>> i'm still getting a lot of those call traces:
> >>>> "
> >>>> Call Trace:
> >>>>  [<ffffffffa01d7006>] ext4_es_lru_add+0x26/0x80 [ext4]
> >>>>  [<ffffffffa01d7286>] ext4_es_insert_extent+0x96/0x100 [ext4]
> >>>>  [<ffffffffa01c3fd3>] ? ext4_find_delalloc_range+0x23/0x60 [ext4]
> >>>>  [<ffffffffa019b781>] ext4_map_blocks+0x111/0x450 [ext4]
> >>>>  [<ffffffffa019d167>] _ext4_get_block+0x87/0x190 [ext4]
> >>>>  [<ffffffffa019d2c6>] ext4_get_block+0x16/0x20 [ext4]
> >>>>  [<ffffffff8117f73f>] generic_block_bmap+0x3f/0x50
> >>>>  [<ffffffffa013f4ae>] ? jbd2_journal_file_buffer+0x4e/0x80 [jbd2]
> >>>>  [<ffffffff810f6242>] ? mapping_tagged+0x12/0x20
> >>>>  [<ffffffffa019ad71>] ext4_bmap+0x91/0xf0 [ext4]
> >>>>  [<ffffffff811686de>] bmap+0x1e/0x30
> >>>>  [<ffffffffa0148063>] jbd2_journal_bmap+0x33/0xb0 [jbd2]
> >>>>  [<ffffffffa014831d>] jbd2_journal_next_log_block+0x7d/0x90 [jbd2]
> >>>>  [<ffffffffa0140238>] jbd2_journal_commit_transaction+0x7f8/0x1ae0 [jbd2]
> >>>>  [<ffffffff81084e13>] ? idle_balance+0xd3/0x110
> >>>>  [<ffffffff8105a018>] ? lock_timer_base.isra.35+0x38/0x70
> >>>>  [<ffffffffa014593a>] kjournald2+0xba/0x230 [jbd2]
> >>>>  [<ffffffff81070360>] ? finish_wait+0x80/0x80
> >>>>  [<ffffffffa0145880>] ? jbd2_journal_release_jbd_inode+0x130/0x130 [jbd2]
> >>>>  [<ffffffff8106fb60>] kthread+0xc0/0xd0
> >>>>  [<ffffffff8106faa0>] ? kthread_create_on_node+0x130/0x130
> >>>>  [<ffffffff81554c2c>] ret_from_fork+0x7c/0xb0
> >>>>  [<ffffffff8106faa0>] ? kthread_create_on_node+0x130/0x130
> >>>> "
> >>>>
> >>>> Is there any chance to fix them in vanilla 3.10.61?
> >>>   Ted is just testing patches to fix these. You are welcome if you can give
> >>> them a try as well (tarball attached). I'm not sure patches will be
> >>> backported as far as to 3.10-stable but when the patches get some testing
> >>> in mainline, I'll be porting them to 3.12-stable for our enterprise
> >>> kernel...
> >>
> >> OK i tried to port them to 3.10 but it seems i can't handle this. There
> >> are so many differences. Are there any workarounds possible? Currently
> >> the 3.10 kernel is also completely crashing with this backtrace.
> >   No workarounds I'm aware of. Sorry. When I have patches for 3.12, you can
> > try porting them to 3.10. That should be an easier task...
> > 
> > 								Honza
> 
> those patches work absolutely fine on a 3.16 kernel. Do you have any
> idea, when your 3.12 backport is done?
  Thanks for confirmation. I hope to backport the patches sometime next
week.

								Honza
-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR