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    Subject2.6.21-rc2-mm1: EIP is at ext2_discard_reservation+0x1c/0x52
    BUG: unable to handle kernel paging request at virtual address 5a5a5a72
    printing eip:
    c01b09fd
    *pde = 00000000
    Oops: 0000 [#1]
    PREEMPT DEBUG_PAGEALLOC
    last sysfs file: devices/pci0000:00/0000:00:1d.3/usb5/5-0:1.0/bInterfaceProtocol
    CPU: 0
    EIP: 0060:[<c01b09fd>] Not tainted VLI
    EFLAGS: 00010206 (2.6.21-rc2-mm1 #1)
    EIP is at ext2_discard_reservation+0x1c/0x52
    eax: dec2bdf8 ebx: 5a5a5a5a ecx: d8f14000 edx: c01b4fe4
    esi: d70c6ddc edi: 5a5a5a6e ebp: 00000000 esp: d8f15dc8
    ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
    Process ccache (pid: 6406, ti=d8f14000 task=ccaef5b0 task.ti=d8f14000)
    Stack: d70c6d0c 5a5a5a5a 00000044 00000000 c01b4ff4 d70c6ddc d70c6fdc c015b69d
    00000000 d70c6ddc deddabf8 c015b8c6 d70c6ddc 00000000 c015aede ffffffe4
    c01b27c8 c01f75c4 00000246 c03b5f80 c03b5f80 df90e758 c01599a0 c045cfe8
    Call Trace:
    [<c01b4ff4>] ext2_clear_inode+0x10/0x27
    [<c015b69d>] clear_inode+0x8f/0xdd
    [<c015b8c6>] generic_drop_inode+0x115/0x125
    [<c015aede>] iput+0x60/0x62
    [<c01b27c8>] ext2_new_inode+0x8fd/0x941
    [<c01f75c4>] _atomic_dec_and_lock+0x10/0x44
    [<c01599a0>] __d_lookup+0x6a/0x10a
    [<c01599a0>] __d_lookup+0x6a/0x10a
    [<c030726b>] _spin_unlock+0x25/0x3b
    [<c0159a23>] __d_lookup+0xed/0x10a
    [<c01b45ec>] ext2_create+0xc/0x95
    [<c01b45e0>] ext2_create+0x0/0x95
    [<c0151f14>] vfs_create+0x5f/0x6c
    [<c0154282>] open_namei+0x177/0x555
    [<c014ac56>] do_filp_open+0x25/0x39
    [<c030726b>] _spin_unlock+0x25/0x3b
    [<c014aa62>] get_unused_fd+0xaa/0xb4
    [<c014aca4>] do_sys_open+0x3a/0x6b
    [<c014ad0e>] sys_open+0x1c/0x1e
    [<c0102586>] sysenter_past_esp+0x5f/0x99
    =======================
    Code: 00 00 c7 42 20 00 00 00 00 89 56 88 5b 5e c3 55 57 56 53 89 c6 8b 58 88 8b 80 24 01 00 00 8b 80 98 02 00 00 85 db 74 34 8d 7b 14 <83> 7f 04 00 74 2b 8d a8 c8 00 00 00 89 e8 e8 b6 63 15 00 83 7f
    EIP: [<c01b09fd>] ext2_discard_reservation+0x1c/0x52 SS:ESP 0068:d8f15dc8
    ------------------------------------------------------------------

    This happened after following build script which
    a) blows old build dirs and old cloned kernel
    b) clones kernel to ext2 partition from reiserfs partition
    c) starts build with help of .ccache also on ext2 partition
    it is mostly filled:
    /dev/hda4 8649576 7438480 771720 91% /home/ad/.ccache
    d) make hangs somewhere after CC init/main.o


    /dev/sda1 /home/linux ext2 defaults,noatime 0 0
    /dev/hda4 /home/ad/.ccache ext2 defaults,noatime 0 0
    ------------------------------------------------------------------
    #!/bin/sh -x

    cd /home/linux
    rm -rf logs build linux-irq-flags-t
    git clone -s ~/linux/linux-linus linux-irq-flags-t
    cd linux-irq-flags-t
    patch -p1 <../akmk.patch || exit 1
    find . -type f -name '*.orig' | xargs rm -f
    git commit -a -m 'akmk.patch' || exit 1

    make tags &

    mkdir ../logs ../build

    TARGET=i386-allnoconfig
    mkdir ../build/$TARGET
    make O=../build/$TARGET allnoconfig >/dev/null
    akmk $TARGET -k 2>&1 | tee ../logs/$TARGET-000.log

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