From: Dave Jones <davej@codemonkey.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Chris Mason <clm@fb.com>, Andy Lutomirski <luto@amacapital.net>,
Andy Lutomirski <luto@kernel.org>, Jens Axboe <axboe@fb.com>,
Al Viro <viro@zeniv.linux.org.uk>, Josef Bacik <jbacik@fb.com>,
David Sterba <dsterba@suse.com>,
linux-btrfs <linux-btrfs@vger.kernel.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Dave Chinner <david@fromorbit.com>
Subject: Re: bio linked list corruption.
Date: Wed, 26 Oct 2016 14:18:33 -0400 [thread overview]
Message-ID: <20161026181833.ld7atax6yqbdgz7p@codemonkey.org.uk> (raw)
In-Reply-To: <CA+55aFzsrRenu3NsDYr3qqO=fC9FUxkLc3M2wzeLBpN7ghwvwA@mail.gmail.com>
On Wed, Oct 26, 2016 at 09:48:39AM -0700, Linus Torvalds wrote:
> On Wed, Oct 26, 2016 at 9:30 AM, Dave Jones <davej@codemonkey.org.uk> wrote:
> >
> > I gave this a go last thing last night. It crashed within 5 minutes,
> > but it was one we've already seen (the bad page map trace) with nothing
> > additional that looked interesting.
>
> Did the bad page map trace have any registers that looked like they
> had 0xd0d0d0d0d0d0 in them?
>
> I assume not, but worth checking.
sadly not. In case I did overlook something, here's last nights..
BUG: Bad page state in process kworker/u8:13 pfn:4dae31
page:ffffea00136b8c40 count:0 mapcount:0 mapping:ffff8804f011d6e0 index:0xd1530
flags: 0x400000000000000c(referenced|uptodate)
page dumped because: non-NULL mapping
CPU: 3 PID: 1207 Comm: kworker/u8:13 Not tainted 4.9.0-rc2-think+ #3
Workqueue: writeback wb_workfn
(flush-btrfs-1)
ffffc900006fb870
ffffffff8130cf3c
ffffea00136b8c40
ffffffff819ff54c
ffffc900006fb898
ffffffff811511af
0000000000000000
ffffea00136b8c40
400000000000000c
ffffc900006fb8a8
ffffffff8115126a
ffffc900006fb8f0
Call Trace:
[<ffffffff8130cf3c>] dump_stack+0x4f/0x73
[<ffffffff811511af>] bad_page+0xbf/0x120
[<ffffffff8115126a>] free_pages_check_bad+0x5a/0x70
[<ffffffff81153b68>] free_hot_cold_page+0x248/0x290
[<ffffffff81153e6b>] free_hot_cold_page_list+0x2b/0x50
[<ffffffff8115c87d>] release_pages+0x2bd/0x350
[<ffffffff8115ddb2>] __pagevec_release+0x22/0x30
[<ffffffffa00a0d4e>] extent_write_cache_pages.isra.48.constprop.63+0x32e/0x400 [btrfs]
[<ffffffffa00a1199>] extent_writepages+0x49/0x60 [btrfs]
[<ffffffffa0081840>] ? btrfs_releasepage+0x40/0x40 [btrfs]
[<ffffffffa007e993>] btrfs_writepages+0x23/0x30 [btrfs]
[<ffffffff8115af9c>] do_writepages+0x1c/0x30
[<ffffffff811f6d73>] __writeback_single_inode+0x33/0x180
[<ffffffff811f7568>] writeback_sb_inodes+0x2a8/0x5b0
[<ffffffff811f7abb>] wb_writeback+0xeb/0x1f0
[<ffffffff811f80f2>] wb_workfn+0xd2/0x280
[<ffffffff810908a5>] process_one_work+0x1d5/0x490
[<ffffffff81090845>] ? process_one_work+0x175/0x490
[<ffffffff81090ba9>] worker_thread+0x49/0x490
[<ffffffff81090b60>] ? process_one_work+0x490/0x490
[<ffffffff81095d1e>] kthread+0xee/0x110
[<ffffffff81095c30>] ? kthread_park+0x60/0x60
[<ffffffff81790a52>] ret_from_fork+0x22/0x30
> > Heisenbugs man, literally the worst.
>
> I know you already had this in some email, but I lost it. I think you
> narrowed it down to a specific set of system calls that seems to
> trigger this best. fallocate and xattrs or something?
I did. Or so I thought. Then iirc, it ran for a really long time
with those. I'll revisit that just to be sure.
Something else I tried: Trinity is very heavily stressing
the fork path, with new children forking off and doing crazy shit
all the time, segfaulting, repeat. I wrote a small test app that
models all of that sans the "do crazy shit with syscalls", and that
didn't do anything useful in terms of reproducing this.
I hoped that had panned out, because I could totally see the relationship
between reusing vmap'ing stacks and heavy fork() use.
Perhaps I'm still missing something non-obvious.
Dave
next prev parent reply other threads:[~2016-10-26 18:18 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-11 14:45 btrfs bio linked list corruption Dave Jones
2016-10-11 15:11 ` Al Viro
2016-10-11 15:19 ` Dave Jones
2016-10-11 15:20 ` Chris Mason
2016-10-11 15:49 ` Dave Jones
2016-10-11 15:54 ` Chris Mason
2016-10-11 16:25 ` Dave Jones
2016-10-12 13:47 ` Dave Jones
2016-10-12 14:40 ` Dave Jones
2016-10-12 14:42 ` Chris Mason
2016-10-13 18:16 ` Dave Jones
2016-10-13 21:18 ` Chris Mason
2016-10-13 21:56 ` Dave Jones
2016-10-16 0:42 ` Dave Jones
2016-10-18 1:07 ` Chris Mason
2016-10-18 22:42 ` Dave Jones
2016-10-18 23:12 ` Jens Axboe
2016-10-18 23:31 ` Chris Mason
2016-10-18 23:36 ` Jens Axboe
2016-10-18 23:39 ` Linus Torvalds
2016-10-18 23:42 ` Chris Mason
2016-10-19 0:10 ` Linus Torvalds
2016-10-19 0:19 ` Chris Mason
2016-10-19 0:28 ` Linus Torvalds
2016-10-20 22:48 ` Dave Jones
2016-10-19 1:05 ` Andy Lutomirski
2016-10-20 22:50 ` Dave Jones
2016-10-20 23:01 ` Andy Lutomirski
2016-10-20 23:03 ` Dave Jones
2016-10-20 23:23 ` Andy Lutomirski
2016-10-21 20:02 ` Dave Jones
2016-10-21 20:17 ` Chris Mason
2016-10-21 20:23 ` Dave Jones
2016-10-21 20:38 ` Chris Mason
2016-10-21 20:41 ` Josef Bacik
2016-10-21 21:11 ` Dave Jones
2016-10-22 15:20 ` Dave Jones
2016-10-23 21:32 ` Chris Mason
2016-10-24 4:40 ` Dave Jones
2016-10-24 13:42 ` Chris Mason
2016-10-26 0:27 ` Dave Jones
2016-10-26 1:33 ` Linus Torvalds
2016-10-26 1:39 ` Linus Torvalds
2016-10-26 16:30 ` Dave Jones
2016-10-26 16:48 ` Linus Torvalds
2016-10-26 18:18 ` Dave Jones [this message]
2016-10-26 18:42 ` Dave Jones
2016-10-26 19:06 ` Linus Torvalds
2016-10-26 20:00 ` Chris Mason
2016-10-26 21:52 ` Chris Mason
2016-10-26 22:21 ` Linus Torvalds
2016-10-26 22:40 ` Dave Jones
2016-10-26 22:51 ` Linus Torvalds
2016-10-26 22:55 ` Jens Axboe
2016-10-26 22:58 ` Linus Torvalds
2016-10-26 23:03 ` Jens Axboe
2016-10-26 23:07 ` Dave Jones
2016-10-26 23:08 ` Linus Torvalds
2016-10-26 23:20 ` Jens Axboe
2016-10-26 23:38 ` Chris Mason
2016-10-26 23:47 ` Dave Jones
2016-10-27 0:00 ` Jens Axboe
2016-10-27 13:33 ` Chris Mason
2016-10-31 18:55 ` Dave Jones
2016-10-31 19:35 ` Linus Torvalds
2016-10-31 19:44 ` Chris Mason
2016-11-06 16:55 ` btrfs btree_ctree_super fault Dave Jones
2016-11-08 14:59 ` Dave Jones
2016-11-08 15:08 ` Chris Mason
2016-11-10 14:35 ` Dave Jones
2016-11-10 15:27 ` Chris Mason
2016-11-23 19:34 ` bio linked list corruption Dave Jones
2016-11-23 19:58 ` Dave Jones
2016-12-01 15:32 ` btrfs_destroy_inode warn (outstanding extents) Dave Jones
2016-12-03 16:48 ` Dave Jones
2016-12-07 16:15 ` Dave Jones
2016-12-09 21:12 ` Steven Rostedt
2016-12-04 23:04 ` bio linked list corruption Vegard Nossum
2016-12-05 11:10 ` Vegard Nossum
2016-12-05 17:09 ` Vegard Nossum
2016-12-05 17:21 ` Dave Jones
2016-12-05 17:55 ` Linus Torvalds
2016-12-05 19:11 ` Vegard Nossum
2016-12-05 20:10 ` Linus Torvalds
2016-12-05 20:35 ` Linus Torvalds
2016-12-05 21:33 ` Vegard Nossum
2016-12-06 8:42 ` Vegard Nossum
2016-12-06 8:16 ` Peter Zijlstra
2016-12-06 8:36 ` Ingo Molnar
2016-12-06 16:33 ` Linus Torvalds
2016-12-05 20:10 ` Vegard Nossum
2016-12-05 18:11 ` Andy Lutomirski
2016-12-05 18:25 ` Linus Torvalds
2016-12-05 18:26 ` Vegard Nossum
2016-10-26 23:19 ` Chris Mason
2016-10-26 23:21 ` Jens Axboe
2016-10-27 6:33 ` Christoph Hellwig
2016-10-27 16:34 ` Linus Torvalds
2016-10-27 16:36 ` Jens Axboe
2016-10-26 23:01 ` Dave Jones
2016-10-26 23:05 ` Jens Axboe
2016-10-26 22:52 ` Jens Axboe
2016-10-26 22:07 ` Linus Torvalds
2016-10-26 22:54 ` Chris Mason
2016-10-27 5:41 ` Dave Chinner
2016-10-27 17:23 ` Dave Jones
2016-10-24 20:06 ` Andy Lutomirski
2016-10-24 20:46 ` Linus Torvalds
2016-10-24 21:17 ` Linus Torvalds
2016-10-24 21:50 ` Linus Torvalds
2016-10-24 22:02 ` Chris Mason
2016-10-24 22:42 ` Andy Lutomirski
2016-10-25 0:00 ` Linus Torvalds
2016-10-25 1:09 ` Andy Lutomirski
2016-10-19 17:09 ` Philipp Hahn
2016-10-19 17:43 ` Linus Torvalds
2016-10-20 6:52 ` Ingo Molnar
2016-10-20 7:17 ` Thomas Gleixner
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