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SubjectRe: [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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