linux-kernel - Re: [3.11-rc1 regression] ext4_evict_inode triggers warn_slowpath

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Date:	Mon, 22 Jul 2013 13:13:22 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Mikael Pettersson <mikpe@...uu.se>, linux-kernel@...r.kernel.org
Subject: Re: [3.11-rc1 regression] ext4_evict_inode triggers
 warn_slowpath_common on sparc64

Theodore Ts'o writes:
 > 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.

Thanks!  Installing -rc2 today..

/Mikael
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