http://bugzilla.kernel.org/show_bug.cgi?id=13964
Summary: ext4: panic causes lost data in git
Product: File System
Version: 2.5
Kernel Version: 2.6.31-rc5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: ext4
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
When working within a local git tree, I committed a change, compiled and
reloaded my driver, which caused a panic.
After reboot my .git/objects/xx/xxxx (latest commit) had empty files. This
doesn't seem to be an acceptable loss of data. I've since started mounting
/home with data=ordered in the hope it would help.
I've mounted my LVM / and /home partitions with the default options
here is the output of tune2fs on /home
[root@jbrandeb-hc jbrandeb]# tune2fs -l /dev/mapper/vg_jbrandebhc-HomeVol
tune2fs 1.41.4 (27-Jan-2009)
Filesystem volume name: <none>
Last mounted on: /home
Filesystem UUID: 696e2e7d-467d-47b3-992e-a28dcf9b1ef8
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: 8454144
Block count: 33792000
Reserved block count: 1689600
Free blocks: 32742879
Free inodes: 8386475
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1015
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
Flex block group size: 16
Filesystem created: Tue Jun 23 09:50:14 2009
Last mount time: Tue Aug 11 11:55:14 2009
Last write time: Tue Aug 11 11:55:14 2009
Mount count: 1
Maximum mount count: -1
Last checked: Tue Aug 11 11:55:06 2009
Check interval: 0 (<none>)
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
Default directory hash: half_md4
Directory Hash Seed: 25ca440e-1707-4084-ac05-3addd26ad952
Journal backup: inode blocks
Any other information will be gladly provided.
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--- Comment #1 from Jesse Brandeburg <[email protected]> 2009-08-11 19:02:48 ---
related info, I'll try the alloc_on_commit option
http://www.h-online.com/open/Ext4-data-loss-explanations-and-workarounds--/news/112892
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Roland Kletzing <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #2 from Roland Kletzing <[email protected]> 2009-08-28 19:34:16 ---
i also have seen this issue, but i can`t find alloc_on_commit option in latest
.git kernel. hasn`t the appropriate patch been merged?
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Theodore Tso <[email protected]> changed:
What |Removed |Added
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--- Comment #3 from Theodore Tso <[email protected]> 2009-08-29 02:47:23 ---
The alloc_on_commit patch had a number of deadlock problems, and I've never had
time to try to work them out.
For now, the recommended solution for git is to put the following in your
.gitconfig file:
[core]
fsyncobjectfiles = yes
This will cause git to force an fsync() when writing object files, which is the
only portable way of guaranteeing the object files will be written after a
crash. This is needed for safety reasons for ext4, xfs, and btrfs filesystems.
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--- Comment #4 from Roland Kletzing <[email protected]> 2009-08-29 13:06:46 ---
ok, but what is the solution for all the apps which don`t have issues with ext3
but start having issues with ext4? fix all the apps? that would take a long
time... alloc_on_commit really sounds like a good compatibility switch....
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