From: "Theodore Ts'o" <tytso@mit.edu>
To: Mikael Pettersson <mikpe@it.uu.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [3.11-rc1 regression] ext4_evict_inode triggers warn_slowpath_common on sparc64
Date: Fri, 19 Jul 2013 21:35:00 -0400 [thread overview]
Message-ID: <20130720013500.GC12042@thunk.org> (raw)
In-Reply-To: <20969.30581.961878.138915@pilspetsen.it.uu.se>
On Fri, Jul 19, 2013 at 07:29:25PM +0200, Mikael Pettersson wrote:
> I keep getting the following warning with 3.11-rc1 on sparc64:
>
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 8174 at fs/ext4/inode.c:230 ext4_evict_inode+0x1f0/0x448()
> Modules linked in: sunrpc af_packet ipv6 hid_generic snd_ali5451 snd_ac97_codec snd_seq snd_seq_device snd_pcm tg3 snd_timer flash ohci_pci hwmon snd soundcore ptp evdev sg i2c_ali1535 ohci_hcd pps_core snd_page_alloc i2c_core ac97_bus sr_mod cdrom pata_ali libata
> CPU: 1 PID: 8174 Comm: xgcc Not tainted 3.11.0-rc1 #1
> Call Trace:
> [00000000004537b0] warn_slowpath_common+0x4c/0x64
> [0000000000540d78] ext4_evict_inode+0x1f0/0x448
> [00000000004f3938] evict+0xb8/0x190
> [00000000004e99bc] do_unlinkat+0xf4/0x160
> [0000000000406174] linux_sparc_syscall32+0x34/0x40
> ---[ end trace cd72b9e3e68d89e4 ]---
>
> The Comm varies, but the call trace always looks like that. Happens a couple
> of times per day, so far. No other ill effects observed. Didn't happen in 3.10
> or older kernels.
The fix, commit 822dbba33458cd6ad is already in Linus's tree, and will
be included in -rc2.
Note that this can cause memory corruption caused by a use-after-free.
I've not noticed a problem in my personal testing, but it's been
reported to me that with stress testing (using memory cgroups amonng
other things) and the system wedged when the machine was rebooted
after the tests were completed, and it only came back after the
watchdog timer fired. The fix up was one of the first things which
Linus pulled after releasing -rc1, so you can merge 47188d39b5de to
get the fixes.
Cheers,
- Ted
next prev parent reply other threads:[~2013-07-20 1:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-19 17:29 [3.11-rc1 regression] ext4_evict_inode triggers warn_slowpath_common on sparc64 Mikael Pettersson
2013-07-20 1:35 ` Theodore Ts'o [this message]
2013-07-22 11:13 ` Mikael Pettersson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130720013500.GC12042@thunk.org \
--to=tytso@mit.edu \
--cc=linux-kernel@vger.kernel.org \
--cc=mikpe@it.uu.se \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox