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Date: Mon, 22 Oct 2012 15:45:41 +0200 From: Jan Kara <jack@...e.cz> To: Fabio Coatti <fabio.coatti@...il.com> Cc: NeilBrown <neilb@...e.de>, Jan Kara <jack@...e.cz>, "Myklebust, Trond" <Trond.Myklebust@...app.com>, Paul Bolle <pebolle@...cali.nl>, linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...hat.com> Subject: Re: ext3 issue on 3.6.1 On Mon 22-10-12 12:23:03, Fabio Coatti wrote: > 2012/10/19 Fabio Coatti <fabio.coatti@...il.com>: > > 2012/10/19 NeilBrown <neilb@...e.de>: > >> On Fri, 19 Oct 2012 00:08:09 +0200 Jan Kara <jack@...e.cz> wrote: > >> > >>> On Thu 18-10-12 23:40:25, Paul Bolle wrote: > >>> > On Thu, 2012-10-18 at 23:23 +0200, Jan Kara wrote: > >>> > > On Fri 12-10-12 14:57:55, Fabio Coatti wrote: > >>> > > > [13031.051521] ------------[ cut here ]------------ > >>> > > > [13031.051576] WARNING: at fs/inode.c:280 drop_nlink+0x1b/0x35() > >>> > > > [13031.051624] Hardware name: ProLiant BL465c G7 > >>> > > > [13031.051668] Pid: 3344, comm: php Tainted: G W > >>> > > > 3.6.1-1000hz-preempt #2 > >>> > > > [13031.051746] Call Trace: > >>> > > > [13031.051787] [<ffffffff810578c4>] ? warn_slowpath_common+0x73/0x87 > >>> > > > [13031.051837] [<ffffffff810ec628>] ? drop_nlink+0x1b/0x35 > >>> > > > [13031.051885] [<ffffffff8118ad51>] ? nfs_dentry_iput+0x33/0x49 > >>> > > > [13031.051934] [<ffffffff810ea920>] ? d_kill+0xe8/0x108 > >>> > > > [13031.051980] [<ffffffff810eb001>] ? dput+0x147/0x154 > >>> > > > [13031.052027] [<ffffffff810d9e46>] ? __fput+0x19a/0x1b2 > >>> > > > [13031.052073] [<ffffffff8106bdf0>] ? task_work_run+0x4c/0x60 > >>> > > > [13031.052123] [<ffffffff815ff5e8>] ? int_signal+0x12/0x17 > >>> > > > [13031.052169] ---[ end trace e60232a455c8e2dd ]--- > >>> > > And this seems unrelated - likely an NFS problem... Let's sort this out > >>> > > if you still see it after ext3 issue is solved. > >>> > > >>> > Looks rather similar too https://lkml.org/lkml/2012/8/29/165 , doesn't > >>> > it? > >>> Yup. I wonder why that patch didn't get merged. Neil? > >>> > >>> Honza > >> > >> Don't know. Maybe I slipped under Trond's radar some how. > >> > >> Trond: can you comment on and hopefully apply this patch? > >> > >> Subject of original email was "WARNING: at fs/inode.c:280 drop_nlink+0x31/0x33() > > > > I'll apply this patch and see what happens, I guess it applies also to > > 3.6.2 where I still see the warning. Could this be a culprit for > > several server lockups that we are seeing in 3.6.X machines and not in > > 2.6.39.X? I'm running some tests with 3.6.X with same setup of other > > machines wth 2.6.39.X and where the new kernel is installed at least > > once a day the machines lockups (not a reassuring thing :) . To answer > > to previous questions, yes, the server has a ext3 read only mount and > > no, the logs shows no other weird things besides the one I posted > > before (see below for a fresh one on 3.6.2). The server has several > > nfs mounts, all R/W. > > > > Ok, after some days of running the modified kernel, the news are not so good :( > > the kernel (3.6.2) message reported above disappeared (dmesg is > clean), however the server is not usable and now I get several 100%CPU > eating processes (namely, apache) and on reboot the console spits out > the message attached (unfortunately a ugly picture, the message was > visible only in a remote console with no history). Sorry, not much I can say about that one... > Then I've given a try to 3.6.3 with the same suggested patch, as I see > nothing related on changelog, but I got the following message: > > [ 228.849355] ------------[ cut here ]------------ > [ 228.849529] WARNING: at fs/ext3/inode.c:1754 > ext3_journalled_writepage+0x55/0x1a7() > [ 228.849706] Hardware name: ProLiant BL465c G7 > [ 228.849833] Pid: 2749, comm: flush-8:0 Not tainted 3.6.3-p #1 > [ 228.849953] Call Trace: > [ 228.850070] [<ffffffff81057884>] ? warn_slowpath_common+0x73/0x87 > [ 228.850192] [<ffffffff8115ccd6>] ? ext3_journalled_writepage+0x55/0x1a7 > [ 228.850343] [<ffffffff810a2833>] ? __writepage+0xa/0x21 > [ 228.850474] [<ffffffff810a31db>] ? write_cache_pages+0x206/0x2f8 > [ 228.850598] [<ffffffff810a2829>] ? set_page_dirty+0x5e/0x5e > [ 228.850721] [<ffffffff81297ccb>] ? queue_unplugged+0x28/0x34 > [ 228.850823] [<ffffffff810a330b>] ? generic_writepages+0x3e/0x55 > [ 228.850919] [<ffffffff810f4eb0>] ? __writeback_single_inode+0x39/0xd1 > [ 228.851016] [<ffffffff810f5c69>] ? writeback_sb_inodes+0x206/0x392 > [ 228.851112] [<ffffffff810f5e5c>] ? __writeback_inodes_wb+0x67/0xa2 > [ 228.851208] [<ffffffff810f5ffa>] ? wb_writeback+0xfd/0x18b > [ 228.851315] [<ffffffff810f61c5>] ? wb_do_writeback+0x13d/0x1a2 > [ 228.851436] [<ffffffff81061e9b>] ? add_timer_on+0x61/0x61 > [ 228.851529] [<ffffffff810f62a9>] ? bdi_writeback_thread+0x7f/0x13e > [ 228.851624] [<ffffffff810f622a>] ? wb_do_writeback+0x1a2/0x1a2 > [ 228.851719] [<ffffffff810f622a>] ? wb_do_writeback+0x1a2/0x1a2 > [ 228.851815] [<ffffffff8106e134>] ? kthread+0x81/0x89 > [ 228.851909] [<ffffffff81607e74>] ? kernel_thread_helper+0x4/0x10 > [ 228.852004] [<ffffffff8106e0b3>] ? kthread_worker_fn+0xe0/0xe0 > [ 228.852098] [<ffffffff81607e70>] ? gs_change+0xb/0xb > [ 228.852189] ---[ end trace 67e723d93533674a ]--- We had this one previously, didn't we? And I asked: Can you post full kernel log (dmesg)? Do you have any filesystem mounted read-only when you see the message? Honza -- Jan Kara <jack@...e.cz> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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