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    SubjectRe: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards
    From
    On Tue, Apr 19, 2011 at 6:46 PM, James Bottomley
    <James.Bottomley@hansenpartnership.com> wrote:
    > It compiles OK, but crashes on boot in fsck.  The crash is definitely mm
    > but looks to be a slab problem (it's a null deref on a spinlock in
    > add_partial(), which seems unrelated to this patch).
    >
    > [   15.628000] sd 1:0:2:0: [sdc] Attached SCSI disk
    > done.
    > [   16.632000] EXT3-fs: barriers not enabled
    > [   16.640000] kjournald starting.  Commit interval 5 seconds
    > [   16.640000] EXT3-fs (sda3): mounted filesystem with ordered data mode
    > Begin: Running /scripts/local-bottom ... done.
    > done.
    > Begin: Running /scripts/init-bottom ... done.
    > INIT: version 2.88 booting
    > Setting hostname to 'ion'...done.
    > Starting the hotplug events dispatcher: udevd[   22.008000] udev[211]: starting version 164
    > .
    > Synthesizing the initial hotplug events...done.
    > Waiting for /dev to be fully populated...done.
    > Activating swap:swapon on /dev/sda2
    > swapon: /dev/sda2: found swap signature: version 1, page-size 4, same byte order
    > swapon: /dev/sda2: pagesize=4096, swapsize=1028157440, devsize=1028160000
    > [   28.780000] Adding 1004056k swap on /dev/sda2.  Priority:-1 extents:1 across:1004056k
    > .
    > Will now check root file system:fsck from util-linux-ng 2.17.2
    > [/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a -C0 /dev/sda3
    > /dev/sda3 has been mounted 37 times without being checked, check forced.
    > [  257.192000] Backtrace:===========                                \ 42.8%
    > [  257.192000]  [<0000000040214f78>] add_partial+0x28/0x98
    > [  257.192000]  [<0000000040217ff8>] __slab_free+0x1d0/0x1d8
    > [  257.192000]  [<000000004021825c>] kmem_cache_free+0xc4/0x128
    > [  257.192000]  [<00000000401fd1a4>] remove_vma+0x8c/0xc0
    > [  257.192000]  [<00000000401fd3a8>] exit_mmap+0x1d0/0x220
    > [  257.192000]  [<0000000040156514>] mmput+0xd4/0x200
    > [  257.192000]  [<000000004015c7b8>] exit_mm+0x100/0x2c0
    > [  257.192000]  [<000000004015ef40>] do_exit+0x778/0x9d8
    > [  257.192000]  [<000000004015f1ec>] do_group_exit+0x4c/0xe0
    > [  257.192000]  [<000000004015f298>] sys_exit_group+0x18/0x28
    > [  257.192000]  [<0000000040106034>] syscall_exit+0x0/0x14
    > [  257.192000]
    > [  257.192000]
    > [  257.192000] Kernel Fault: Code=26 regs=00000040bf1807d0 (Addr=0000000000000000)
    > [  257.192000]
    > [  257.192000]      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
    > [  257.192000] PSW: 00001000000001001111000000001110 Not tainted
    > [  257.192000] r00-03  000000ff0804f00e 0000000040769e40 0000000040214f78 0000000000000000
    > [  257.192000] r04-07  0000000040746e40 0000000000000001 0000004080ded370 0000000000000001
    > [  257.192000] r08-11  0000000040654150 0000000000000000 0000000000000001 0000000000000001
    > [  257.192000] r12-15  0000000000000000 00000000ffffffff 0000000000000024 0000000000000000
    > [  257.192000] r16-19  00000000fb4ead9c 00000000fb4eac54 0000000000000000 0000000000000000
    > [  257.192000] r20-23  000000000800000e 0000000000000001 000000007bbb7180 00000000401fd1a4
    > [  257.192000] r24-27  0000000000000001 0000004080ded370 0000000000000000 0000000040746e40
    > [  257.192000] r28-31  000000007ec0a908 00000040bf1807a0 00000040bf1807d0 0000000000000016
    > [  257.192000] sr00-03  00000000002d9000 0000000000000000 0000000000000000 00000000002d9000
    > [  257.192000] sr04-07  0000000000000000 0000000000000000 0000000000000000 0000000000000000
    > [  257.192000]
    > [  257.192000] IASQ: 0000000000000000 0000000000000000 IAOQ: 000000004011bbc0 000000004011bbc4
    > [  257.192000]  IIR: 0f4015dc    ISR: 0000000000000000  IOR: 0000000000000000
    > [  257.192000]  CPU:        0   CR30: 00000040bf180000 CR31: fffffff0f0e098e0
    > [  257.192000]  ORIG_R28: 0000000040769e40
    > [  257.192000]  IAOQ[0]: _raw_spin_lock+0x0/0x20
    > [  257.192000]  IAOQ[1]: _raw_spin_lock+0x4/0x20
    > [  257.192000]  RP(r2): add_partial+0x28/0x98
    > [  257.192000] Backtrace:
    > [  257.192000]  [<0000000040214f78>] add_partial+0x28/0x98
    > [  257.192000]  [<0000000040217ff8>] __slab_free+0x1d0/0x1d8
    > [  257.192000]  [<000000004021825c>] kmem_cache_free+0xc4/0x128
    > [  257.192000]  [<00000000401fd1a4>] remove_vma+0x8c/0xc0
    > [  257.192000]  [<00000000401fd3a8>] exit_mmap+0x1d0/0x220
    > [  257.192000]  [<0000000040156514>] mmput+0xd4/0x200
    > [  257.192000]  [<000000004015c7b8>] exit_mm+0x100/0x2c0
    > [  257.192000]  [<000000004015ef40>] do_exit+0x778/0x9d8
    > [  257.192000]  [<000000004015f1ec>] do_group_exit+0x4c/0xe0
    > [  257.192000]  [<000000004015f298>] sys_exit_group+0x18/0x28
    > [  257.192000]  [<0000000040106034>] syscall_exit+0x0/0x14
    > [  257.192000]
    > [  257.192000] Kernel panic - not syncing: Kernel Fault
    > [  257.192000] Backtrace:
    > [  257.192000]  [<000000004011f984>] show_stack+0x14/0x20
    > [  257.192000]  [<000000004011f9a8>] dump_stack+0x18/0x28
    > [  257.192000]  [<000000004015946c>] panic+0xd4/0x368
    > [  257.192000]  [<0000000040120024>] parisc_terminate+0x14c/0x170
    > [  257.192000]  [<000000004012059c>] handle_interruption+0x2ac/0x8f8
    > [  257.192000]  [<000000004011bbc0>] _raw_spin_lock+0x0/0x20
    > [  257.192000]
    > [  257.192000] Rebooting in 5 seconds..
    >
    > It seems to be a random intermittent mm crash because the next reboot
    > crashed with the same trace but after the fsck had completed and the
    > third came up to the login prompt.

    Looks like a genuine SLUB problem on parisc. Christoph?
    --
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