From: Michal Hocko <mhocko@suse.cz>
To: Glauber Costa <glommer@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: linux-next: slab shrinkers: BUG at mm/list_lru.c:92
Date: Tue, 18 Jun 2013 09:42:15 +0200 [thread overview]
Message-ID: <20130618074215.GA13677@dhcp22.suse.cz> (raw)
In-Reply-To: <20130617165409.GA10764@localhost.localdomain>
On Mon 17-06-13 20:54:10, Glauber Costa wrote:
> On Mon, Jun 17, 2013 at 05:33:02PM +0200, Michal Hocko wrote:
[...]
> > I have seen some other traces as well (mentioning ext3 dput paths) but I
> > cannot reproduce them anymore.
> >
>
> Do you have those traces? If there is a bug in the ext3 dput, then it is
> most likely the culprit. dput() is when we insert things into the LRU. So
> if we are not fully inserting an element that we should have - and later
> on try to remove it, we'll go negative.
>
> Can we see those traces?
Unfortunatelly I don't because the machine where I saw those didn't have
a serial console and the traces where scrolling like crazy. Anyway I am
working on reproducing this. Linux next is hard to debug due to
unrelated crashes so I am still with my -mm git tree.
Anyway, I was able to reproduce one of those hangs which smells like the
same/similar issue:
4659 pts/0 S+ 0:00 /bin/sh ./run_batch.sh mmotm
4661 pts/0 S+ 0:00 /bin/bash ./start.sh
4666 pts/0 S+ 5:08 /bin/bash ./start.sh
18294 pts/0 S+ 0:00 sleep 1s
4682 pts/0 S+ 0:00 /bin/bash ./run_test.sh /dev/cgroup B 2
4683 pts/0 S+ 5:16 /bin/bash ./run_test.sh /dev/cgroup B 2
18293 pts/0 S+ 0:00 sleep 1s
8509 pts/0 S+ 0:00 /usr/bin/time -v make -j4 vmlinux
8510 pts/0 S+ 0:00 make -j4 vmlinux
11730 pts/0 S+ 0:00 make -f scripts/Makefile.build obj=drivers
13135 pts/0 S+ 0:00 make -f scripts/Makefile.build obj=drivers/net
13415 pts/0 S+ 0:00 make -f scripts/Makefile.build obj=drivers/net/wireless
13657 pts/0 S+ 0:00 make -f scripts/Makefile.build obj=drivers/net/wireless/rtl818x
13665 pts/0 D+ 0:00 make -f scripts/Makefile.build obj=drivers/net/wireless/rtl818x/rtl8180
13737 pts/0 S+ 0:00 make -f scripts/Makefile.build obj=drivers/net/wireless/rtlwifi
13754 pts/0 D+ 0:00 make -f scripts/Makefile.build obj=drivers/net/wireless/rtlwifi/rtl8192de
13917 pts/0 D+ 0:00 make -f scripts/Makefile.build obj=drivers/net/wireless/rtlwifi/rtl8192se
demon:/home/mhocko # cat /proc/13917/stack
[<ffffffff81179862>] path_lookupat+0x792/0x830
[<ffffffff81179933>] filename_lookup+0x33/0xd0
[<ffffffff8117ab0b>] user_path_at_empty+0x7b/0xb0
[<ffffffff8117ab4c>] user_path_at+0xc/0x10
[<ffffffff8116ff91>] vfs_fstatat+0x51/0xb0
[<ffffffff81170116>] vfs_stat+0x16/0x20
[<ffffffff8117013f>] sys_newstat+0x1f/0x50
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
demon:/home/mhocko # cat /proc/13754/stack
[<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118526f>] iget_locked+0x4f/0x180
[<ffffffff811ef9f3>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a2c>] ext4_lookup+0xbc/0x160
[<ffffffff81174ad0>] lookup_real+0x20/0x60
[<ffffffff81175254>] __lookup_hash+0x34/0x40
[<ffffffff81179872>] path_lookupat+0x7a2/0x830
[<ffffffff81179933>] filename_lookup+0x33/0xd0
[<ffffffff8117ab0b>] user_path_at_empty+0x7b/0xb0
[<ffffffff8117ab4c>] user_path_at+0xc/0x10
[<ffffffff8116ff91>] vfs_fstatat+0x51/0xb0
[<ffffffff81170116>] vfs_stat+0x16/0x20
[<ffffffff8117013f>] sys_newstat+0x1f/0x50
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
demon:/home/mhocko # cat /proc/13665/stack
[<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118526f>] iget_locked+0x4f/0x180
[<ffffffff811ef9f3>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a2c>] ext4_lookup+0xbc/0x160
[<ffffffff81174ad0>] lookup_real+0x20/0x60
[<ffffffff81177e25>] lookup_open+0x175/0x1d0
[<ffffffff8117815e>] do_last+0x2de/0x780
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
Sysrq+l doesn't show only idle CPUs. Ext4 is showing in the traces
because of CONFIG_EXT4_USE_FOR_EXT23=y.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2013-06-18 7:42 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-17 14:18 Michal Hocko
2013-06-17 15:14 ` Glauber Costa
2013-06-17 15:33 ` Michal Hocko
2013-06-17 16:54 ` Glauber Costa
2013-06-18 7:42 ` Michal Hocko [this message]
2013-06-17 21:35 ` Andrew Morton
2013-06-17 22:30 ` Glauber Costa
2013-06-18 2:46 ` Dave Chinner
2013-06-18 6:31 ` Glauber Costa
2013-06-18 8:24 ` Michal Hocko
2013-06-18 10:44 ` Michal Hocko
2013-06-18 13:50 ` Michal Hocko
2013-06-25 2:27 ` Dave Chinner
2013-06-26 8:15 ` Michal Hocko
2013-06-26 23:24 ` Dave Chinner
2013-06-27 14:54 ` Michal Hocko
2013-06-28 8:39 ` Michal Hocko
2013-06-28 14:31 ` Glauber Costa
2013-06-28 15:12 ` Michal Hocko
2013-06-29 2:55 ` Dave Chinner
2013-06-30 18:33 ` Michal Hocko
2013-07-01 1:25 ` Dave Chinner
2013-07-01 7:50 ` Michal Hocko
2013-07-01 8:10 ` Dave Chinner
2013-07-02 9:22 ` Michal Hocko
2013-07-02 12:19 ` Dave Chinner
2013-07-02 12:44 ` Michal Hocko
2013-07-03 11:24 ` Dave Chinner
2013-07-03 14:08 ` Glauber Costa
2013-07-04 16:36 ` Michal Hocko
2013-07-08 12:53 ` Michal Hocko
2013-07-08 21:04 ` Andrew Morton
2013-07-09 17:34 ` Glauber Costa
2013-07-09 17:51 ` Andrew Morton
2013-07-09 17:32 ` Glauber Costa
2013-07-09 17:50 ` Andrew Morton
2013-07-09 17:57 ` Glauber Costa
2013-07-09 17:57 ` Michal Hocko
2013-07-09 21:39 ` Andrew Morton
2013-07-10 2:31 ` Dave Chinner
2013-07-10 7:34 ` Michal Hocko
2013-07-10 8:06 ` Michal Hocko
2013-07-11 2:26 ` Dave Chinner
2013-07-11 3:03 ` Andrew Morton
2013-07-11 13:23 ` Michal Hocko
2013-07-12 1:42 ` Hugh Dickins
2013-07-13 3:29 ` Dave Chinner
2013-07-15 9:14 ` Michal Hocko
2013-06-18 6:26 ` Glauber Costa
2013-06-18 8:25 ` Michal Hocko
2013-06-19 7:13 ` Michal Hocko
2013-06-19 7:35 ` Glauber Costa
2013-06-19 8:52 ` Glauber Costa
2013-06-19 13:57 ` Michal Hocko
2013-06-19 14:02 ` Glauber Costa
2013-06-19 14:28 ` Michal Hocko
2013-06-20 14:11 ` Glauber Costa
2013-06-20 15:12 ` Michal Hocko
2013-06-20 15:16 ` Michal Hocko
2013-06-21 9:00 ` Michal Hocko
2013-06-23 11:51 ` Glauber Costa
2013-06-23 11:55 ` Glauber Costa
2013-06-25 2:29 ` Dave Chinner
2013-06-26 8:22 ` Michal Hocko
2013-06-18 8:19 ` Michal Hocko
2013-06-18 8:21 ` Glauber Costa
2013-06-18 8:26 ` Michal Hocko
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