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Date: Mon, 18 Mar 2013 10:51:19 +0100
From: Markus Trippelsdorf <markus@...ppelsdorf.de>
To: linux-ext4@...r.kernel.org
Subject: Re: "EXT4-fs error: ext4_mb_generate_buddy" errors during rsync
On 2013.03.18 at 17:58 +0800, Zheng Liu wrote:
> On Mon, Mar 18, 2013 at 09:15:51AM +0100, Markus Trippelsdorf wrote:
> > During the nightly rsync run that backups my root filesystem I got:
> >
> > Mar 18 01:52:00 x4 fcron[19997]: Job /usr/bin/rsnapshot daily started for user root (pid 19998)
> > Mar 18 01:56:41 x4 rsnapshot[20187]: /usr/bin/rsnapshot daily: completed successfully
> > Mar 18 01:56:43 x4 fcron[19997]: Job /usr/bin/rsnapshot daily completed (mailing output)
> >
> > Mar 18 01:52:21 x4 kernel: EXT4-fs error (device sda): ext4_mb_generate_buddy:749: group 6817, 7060 clusters in bitmap, 7064 in gd
> > Mar 18 01:52:21 x4 kernel: JBD2: Spotted dirty metadata buffer (dev = sda, blocknr = 0). There's a risk of filesystem corruption in case of system crash.
> > Mar 18 01:56:30 x4 kernel: EXT4-fs error (device sda): ext4_mb_generate_buddy:749: group 6833, 26653 clusters in bitmap, 26656 in gd
> > Mar 18 01:56:30 x4 kernel: EXT4-fs error (device sda): ext4_mb_generate_buddy:749: group 6881, 3985 clusters in bitmap, 3991 in gd
> > Mar 18 01:56:30 x4 kernel: EXT4-fs error (device sda): ext4_mb_generate_buddy:749: group 6897, 5979 clusters in bitmap, 6024 in gd
> >
> > e2fsck 1.42 (29-Nov-2011)
> > Pass 1: Checking inodes, blocks, and sizes
> > Pass 2: Checking directory structure
> > Pass 3: Checking directory connectivity
> > Pass 4: Checking reference counts
> > Pass 5: Checking group summary information
> > Free blocks count wrong for group #6817 (6779, counted=6775).
> > Fix<y>? yes
> > Free blocks count wrong for group #6833 (26575, counted=26572).
> > Fix<y>? yes
> > Free blocks count wrong for group #6881 (3916, counted=3910).
> > Fix<y>? yes
> > Free blocks count wrong for group #6897 (5987, counted=5942).
> > Fix<y>? yes
> > Free blocks count wrong (185850303, counted=185850245).
> > Fix<y>? yes
> > /dev/sdb: ***** FILE SYSTEM WAS MODIFIED *****
> > /dev/sdb: 1619858/91578368 files (0.6% non-contiguous), 180434401/366284646 blocks
> >
> > "smartctl -a /dev/sda" looks fine
>
> Hi Markus,
>
> Could you please provide more details? Such as kernel version, `tune2fs
> -l ${dev}`, etc.... I guess the kernel version is 3.9-rc2, right? :-)
Yes, I'm running latest git with "tytso/ext4.git dev" already pulled in.
Please note that tonight was the first time I saw this error and I run
rsync every night. So the problem is not reproducible.
tune2fs 1.42.7 (21-Jan-2013)
Filesystem volume name: <none>
Last mounted on: /var
Filesystem UUID: 202f2c93-c6c5-4d70-a63f-d770161138bd
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index
filetype needs_recovery extent flex_bg sparse_super large_file huge_file
uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 91578368
Block count: 366284646
Reserved block count: 18314232
Free blocks: 185850351
Free inodes: 89958540
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 936
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
Flex block group size: 16
Filesystem created: Mon Nov 19 16:02:46 2012
Last mount time: Mon Mar 18 08:57:21 2013
Last write time: Mon Mar 18 08:57:21 2013
Mount count: 2
Maximum mount count: -1
Last checked: Mon Mar 18 08:53:39 2013
Check interval: 0 (<none>)
Lifetime writes: 2992 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 52166759
Default directory hash: half_md4
Directory Hash Seed: e86f34a0-390a-49b6-87a9-3336d861ab81
Journal backup: inode blocks
/dev/sda ext4 1.4T 667G 640G 52% /var
/dev/sda on /var type ext4 (rw,noatime,data=ordered)
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 114 099 006 Pre-fail Always - 895168
3 Spin_Up_Time 0x0003 093 092 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 76
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 32
7 Seek_Error_Rate 0x000f 060 056 030 Pre-fail Always - 382342884998
9 Power_On_Hours 0x0032 080 080 000 Old_age Always - 18043
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 52
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 099 099 000 Old_age Always - 1
188 Command_Timeout 0x0032 100 094 000 Old_age Always - 46
189 High_Fly_Writes 0x003a 094 094 000 Old_age Always - 6
190 Airflow_Temperature_Cel 0x0022 069 059 045 Old_age Always - 31 (Min/Max 21/34)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 17
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 77
194 Temperature_Celsius 0x0022 031 041 000 Old_age Always - 31 (0 19 0 0 0)
195 Hardware_ECC_Recovered 0x001a 022 007 000 Old_age Always - 895168
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 2
240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 170475841928047
241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 2862958769
242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 2221200126
--
Markus
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