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    SubjectRe: EXT4 ENOSPC Bug
    Hi All,

    "Luckily", to prove that I am not completly mad I recently found this
    problem again. On a more recent kernel:
    2.6.29-rc3-andres-00498-g68e80d5
    (upstream 2.6.29 + Theodore's ext4 debug patches)

    Again I got:
    open("/home/andres/tt", O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK, 0666) = -1
    ENOSPC (No space left on device)

    When doing `touch /home/andres/tt`

    Again df does not show something suspicious:
    Filesystem Inodes IUsed IFree IUse% Mounted on
    /dev/mapper/root_crypt
    19234816 826296 18408520 5% /
    tmpfs 491025 3 491022 1% /lib/init/rw
    varrun 491025 96 490929 1% /var/run
    varlock 491025 3 491022 1% /var/lock
    udev 491025 5517 485508 2% /dev
    tmpfs 491025 1 491024 1% /dev/shm
    /dev/sda2 61312 110 61202 1% /boot

    Filesystem 1K-blocks Used Available Use% Mounted on
    /dev/mapper/root_crypt
    302855628 202819548 100036080 67% /
    tmpfs 1964100 0 1964100 0% /lib/init/rw
    varrun 1964100 300 1963800 1% /var/run
    varlock 1964100 0 1964100 0% /var/lock
    udev 1964100 92 1964008 1% /dev
    tmpfs 1964100 0 1964100 0% /dev/shm
    /dev/sda2 964532 634052 281484 70% /boot

    Delayed allocations are not showing anything suspicious:
    [72586.050538] ext4 debug delalloc of dm-0
    [72586.050547] ext4: dirty blocks 22 free blocks 25008749
    [72586.050551] s_dirty list:
    [72586.050556] ino 534064: 2 2
    [72586.050559] ino 539981: 2 2
    [72586.050563] ino 524506: 5 2
    [72586.050566] ino 184479: 1 2
    [72586.050571] ino 167172: 2 2
    [72586.050574] ext4 debug delalloc done


    Any debugging ideas?

    I got this twice in the last two months, so its not really easy to
    reproduce :-(

    Andres

    PS: All information is taken out of the running kernel while having the
    problem

    meminfo:
    MemTotal: 3928200 kB
    MemFree: 23312 kB
    Buffers: 239564 kB
    Cached: 2383280 kB
    SwapCached: 0 kB
    Active: 1490948 kB
    Inactive: 2149360 kB
    Active(anon): 879880 kB
    Inactive(anon): 294356 kB
    Active(file): 611068 kB
    Inactive(file): 1855004 kB
    Unevictable: 52 kB
    Mlocked: 52 kB
    SwapTotal: 0 kB
    SwapFree: 0 kB
    Dirty: 52 kB
    Writeback: 4 kB
    AnonPages: 1017356 kB
    Mapped: 129440 kB
    Slab: 123316 kB
    SReclaimable: 94512 kB
    SUnreclaim: 28804 kB
    PageTables: 26936 kB
    NFS_Unstable: 0 kB
    Bounce: 0 kB
    WritebackTmp: 0 kB
    CommitLimit: 1964100 kB
    Committed_AS: 1169664 kB
    VmallocTotal: 34359738367 kB
    VmallocUsed: 341580 kB
    VmallocChunk: 34359392035 kB
    HugePages_Total: 0
    HugePages_Free: 0
    HugePages_Rsvd: 0
    HugePages_Surp: 0
    Hugepagesize: 2048 kB
    DirectMap4k: 86016 kB
    DirectMap2M: 4003840 kB


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