Date:	Tue, 1 Jul 2014 10:55:11 +0200
From:	Matteo Croce <technoboy85@...il.com>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	David Jander <david@...tonic.nl>, linux-ext4@...r.kernel.org,
	"Theodore Ts'o" <tytso@....edu>
Subject: Re: ext4: journal has aborted

2014-07-01 10:42 GMT+02:00 Darrick J. Wong <darrick.wong@...cle.com>:
> On Tue, Jul 01, 2014 at 08:26:19AM +0200, David Jander wrote:
>>
>> Hi,
>>
>> On Mon, 30 Jun 2014 23:30:10 +0200
>> Matteo Croce <technoboy85@...il.com> wrote:
>>
>> > I was web surfing and using gimp when:
>> >
>> > EXT4-fs error (device sda2): ext4_mb_generate_buddy:756: group 199,
>> > 9414 clusters in bitmap, 9500 in gd; block bitmap corrupt.
>>
>> I was about to post a related question to this list. I am also seeing these
>> kind of errors when using ext4 on latest mainline (I began testing with 3.15
>> where I saw this and now in 3.16-rc3 it is still there).
>> It happens almost instantly when power-cycling the system (unclean shutdown).
>> The next time the system boots, I get these errors.
>>
>> AFAICT, you are using a pretty recent kernel. Which version exactly?
>>
>> > Aborting journal on device sda2-8.
>> > EXT4-fs (sda2): Remounting filesystem read-only
>
> Matteo, could you please post the full dmesg log somewhere?  I'm interested in
> what happens before all this happens, because...

I've rebooted the notebook twice

>> > ------------[ cut here ]------------
>> > WARNING: CPU: 6 PID: 4134 at fs/ext4/ext4_jbd2.c:259
>> > __ext4_handle_dirty_metadata+0x18e/0x1d0()
>> > Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek
>> > snd_hda_codec_generic ecb uvcvideo videobuf2_vmalloc videobuf2_memops
>> > videobuf2_core videodev ath3k btusb rts5139(C) ctr ccm iTCO_wdt bnep
>> > rfcomm bluetooth nls_iso8859_1 vfat fat arc4 intel_rapl
>> > x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
>> > snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm
>> > aesni_intel aes_x86_64 snd_seq_midi snd_seq_midi_event ath9k led_class
>> > glue_helper ath9k_common lrw gf128mul ath9k_hw ablk_helper cryptd ath
>> > mac80211 snd_rawmidi snd_seq cfg80211 radeon microcode rfkill
>> > snd_timer snd_seq_device sr_mod psmouse r8169 snd cdrom i915 lpc_ich
>> > soundcore ttm mii mfd_core drm_kms_helper drm intel_gtt agpgart
>> > ehci_pci mei_me xhci_hcd tpm_infineon ehci_hcd video mei wmi tpm
>> > backlight
>> > CPU: 6 PID: 4134 Comm: gimp-2.8 Tainted: G         C    3.15.0 #6
>> >  0000000000000009 ffffffff813acbdd 0000000000000000 ffffffff8103de3d
>> >  ffff8802365231a0 00000000ffffffe2 0000000000000000 ffff8800b90816c0
>> >  ffffffff814205a0 ffffffff8118879e 0000000000000005 ffff8802365231a0
>> > Call Trace:
>> >  [<ffffffff813acbdd>] ? dump_stack+0x41/0x51
>> >  [<ffffffff8103de3d>] ? warn_slowpath_common+0x6d/0x90
>> >  [<ffffffff8118879e>] ? __ext4_handle_dirty_metadata+0x18e/0x1d0
>> >  [<ffffffff8116e130>] ? ext4_dirty_inode+0x20/0x50
>> >  [<ffffffff811903e9>] ? ext4_free_blocks+0x539/0xa40
>> >  [<ffffffff8118468b>] ? ext4_ext_remove_space+0x83b/0xe60
>> >  [<ffffffff81186a58>] ? ext4_ext_truncate+0x98/0xc0
>> >  [<ffffffff8116c985>] ? ext4_truncate+0x2b5/0x300
>> >  [<ffffffff8116d3d8>] ? ext4_evict_inode+0x3d8/0x410
>> >  [<ffffffff81114a46>] ? evict+0xa6/0x160
>> >  [<ffffffff81109346>] ? do_unlinkat+0x186/0x2a0
>> >  [<ffffffff8110e51e>] ? SyS_getdents+0xde/0x100
>> >  [<ffffffff8110e1d0>] ? fillonedir+0xd0/0xd0
>> >  [<ffffffff813b2626>] ? system_call_fastpath+0x1a/0x1f
>> > ---[ end trace 795411398e41fbcb ]---
>> > EXT4: jbd2_journal_dirty_metadata failed: handle type 5 started at
>> > line 241, credits 91/91, errcode -30
>> > EXT4: jbd2_journal_dirty_metadata failed: handle type 5 started at
>> > line 241, credits 91/91, errcode -30<2>EXT4-fs error (device sda2) in
>> > ext4_free_blocks:4867: Journal has aborted
>> > EXT4-fs error (device sda2): ext4_ext_rm_leaf:2731: inode #8257653:
>> > block 6520936: comm gimp-2.8: journal_dirty_metadata failed: handle
>> > type 5 started at line 241, credits 91/91, errcode -30
>> > EXT4-fs error (device sda2) in ext4_ext_remove_space:3018: Journal has
>> > aborted EXT4-fs error (device sda2) in ext4_ext_truncate:4666: Journal has
>> > aborted EXT4-fs error (device sda2) in ext4_reserve_inode_write:4877: Journal
>> > has aborted
>> > EXT4-fs error (device sda2) in ext4_truncate:3788: Journal has aborted
>> > EXT4-fs error (device sda2) in ext4_reserve_inode_write:4877: Journal
>> > has aborted
>> > EXT4-fs error (device sda2) in ext4_orphan_del:2684: Journal has aborted
>> > EXT4-fs error (device sda2) in ext4_reserve_inode_write:4877: Journal
>> > has aborted
>>
>> I did not get these errors. I suspect this may be a consequence of FS
>> corruption due to a bug in etx4.
>>
>> Here's why I suspect a bug:
>>
>> I am running latest git head (3.16-rc3+ as of yesterday) on an ARM system with
>> eMMC flash. The eMMC is formatted in SLC mode ("enhanced" mode according to
>> eMMC 4.41) and "reliable-writes" are enabled, so power-cycling should not
>> cause FS corruption in presence of a journal.

I have a Samsung SSD 840 PRO

>> I can format the eMMC device either as EXT3 or EXT4 for the test. After
>> formatting and writing the rootfs to the partition I can boot successfully in
>> either situation. Once booted from eMMC, I start bonnie++ (to just stress the
>> FS for a while), and after a minute or so the board is power-cycled while
>> bonnie++ is still running.
>>
>> Next time I boot the situation is this:
>>
>> With EXT3: All seems fine, journal is replayed, no errors. I can repeat this as
>> many times as I want, FS stays consistent.
>>
>> With EXT4: After just one power cycle I start getting this:
>>
>> [    7.603871] EXT4-fs error (device mmcblk0p2): ext4_mb_generate_buddy:757: group 1, 8542 clusters in bitmap, 8550 in gd; block bitmap corrupt.
>> [    7.616743] JBD2: Spotted dirty metadata buffer (dev = mmcblk0p2, blocknr = 0). There's a risk of filesystem corruption in case of system crash.
>
> I've been seeing this same set of symptoms with 3.15.0 on various SSDs (Samsung
> 840 Pro, Crucial M4).  It seems that something (upstart?) is holding open some
> file or other during poweroff, which means that the root fs can't be unmounted
> or even remounted rw.  I also noticed that the next time the system comes up,
> the kernel tells me that it has to process the inode orphan list as part of
> recovery.
>
> Shortly after the orphan list gets processed, I get that message and the FS
> goes ro.  A subsequent fsck run reveals that the block bitmap is indeed
> incorrect in that block group, and when I bd the blocks that are incorrect in
> the bitmap, I see what could be some kind of upstart log file.  Either way, I
> suspect some bug in orphan processing.
>
> <shrug> I don't know if this is specific to SSDs or spinning rust.  Right now
> I've simply rigged the initramfs to e2fsck -p the root fs before mounting it,
> which seems(?) to have patched around it for now.
>
>> If I continue the test, it doesn't take long and serious corruption starts
>> occurring.
>
> You're getting actual FS data corruption too?  Or more of those messages?

Actually it seems that there are no corruption

> --D
>>
>> Again, with EXT3 I am unable to detect any problems.
>>
>> Best regards,
>>
>> --
>> David Jander
>> Protonic Holland.
>> --
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-- 
Matteo Croce
OpenWrt Developer
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