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SubjectEXT4 ENOSPC Bug
Date
Hi Ted, Hi Andreas, hi all,

On a testsystem (spare laptop) with ext4 as root filesystem sometimes the
system starts to return ENOSPC to all write/create syscalls.
Sometimes the system runs without problems, at other times it starts having
problems soon after boot.
A reboot resolves the problem temporarily.

I don't see a specific usage triggering the problem.

Deleting some files sometimes allows the creation (just touch $unused_filename)
of some files, but not many.

Anything I can do to help you to debug the problem?

Andres

Kernel is: 2.6.28-rc6-andres-00007-ged31348

# df /
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/root_crypt
302855628 110032848 192822780 37% /

# df -i /
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/mapper/root_crypt
19234816 786691 18448125 5% /


# tune2fs -l /dev/mapper/root_crypt
tune2fs 1.41.3 (12-Oct-2008)
Filesystem volume name: root
Last mounted on: <not available>
Filesystem UUID: b81f5bab-9544-45a9-8f15-aa7012ae2522
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: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 19234816
Block count: 76921099
Reserved block count: 0
Free blocks: 48205695
Free inodes: 18448125
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1005
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 Sep 30 11:57:33 2008
Last mount time: Thu Nov 27 14:30:58 2008
Last write time: Thu Nov 27 14:30:58 2008
Mount count: 116
Maximum mount count: 200
Last checked: Mon Oct 6 13:54:09 2008
Check interval: 31104000 (12 months)
Next check after: Thu Oct 1 13:54:09 2009
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: 288694
Default directory hash: tea
Directory Hash Seed: d0501622-2c99-4b0d-9a0c-d6b6705ff4f2
Journal backup: inode blocks

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