linux-ext4 - EXT4 ENOSPC Bug

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Date:	Sat, 29 Nov 2008 14:18:19 +0100
From:	Andres Freund <andres@...razel.de>
To:	Theodore Tso <tytso@....edu>, adilger@....com
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-ext4@...r.kernel.org
Subject: EXT4 ENOSPC Bug

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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