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    SubjectRe: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub
    --- Ingo Molnar <mingo@elte.hu> wrote:
    > * Srihari Vijayaraghavan <sriharivijayaraghavan@yahoo.com.au> wrote:
    > > Yup, with CONFIG_SMP=n, I'm unable to reproduce the problem. It's
    > > quite stable actually (having completed a dozen kernel compile
    > > sessions so far).

    [...]

    > could you enable CONFIG_PROVE_LOCKING - does it spit out any warning
    > into the syslog?

    Compiled slub with SMP & CONFIG_PROVE_LOCKING. No luck. It still hangs solid
    after the second spinlock lockup call trace.

    Here's the relevant sections of the kernel logs:

    ...
    Freeing unused kernel memory: 228k freed
    BUG: spinlock bad magic on CPU#1, init/1
    lock: ffff81011f5f1100, .magic: ffff8101, .owner: <none>/-1, .owner_cpu: -1

    Call Trace:
    [<ffffffff802f326a>] _raw_spin_lock+0x22/0xf6
    [<ffffffff8026b2d5>] vma_adjust+0x21c/0x446
    [<ffffffff8026b2d5>] vma_adjust+0x21c/0x446
    [<ffffffff8026b9d4>] vma_merge+0x10c/0x195
    [<ffffffff8026c757>] do_mmap_pgoff+0x3f5/0x794
    [<ffffffff803fff0c>] _spin_unlock_irq+0x24/0x27
    [<ffffffff8020f414>] sys_mmap+0xe5/0x110
    [<ffffffff80209dde>] system_call+0x7e/0x83
    ...
    PM: Adding info for No Bus:vcsa1
    BUG: spinlock lockup on CPU#1, hostname/369, ffff81011f5f1fc0

    Call Trace:
    [<ffffffff802f3317>] _raw_spin_lock+0xcf/0xf6
    [<ffffffff8026ec9c>] anon_vma_unlink+0x1c/0x68
    [<ffffffff8026ec9c>] anon_vma_unlink+0x1c/0x68
    [<ffffffff80269aa0>] free_pgtables+0x69/0xc4
    [<ffffffff8026ad0e>] exit_mmap+0x91/0xeb
    [<ffffffff80228cea>] mmput+0x2c/0x9f
    [<ffffffff8022df72>] do_exit+0x22e/0x82e
    [<ffffffff8022e5f4>] sys_exit_group+0x0/0xe
    [<ffffffff80209dde>] system_call+0x7e/0x83


    Surprisingly, with CONFIG_SMP=n, CONFIG_PROVE_LOCKING produces this with slub
    (then hangs solid):

    Freeing unused kernel memory: 188k freed
    BUG: spinlock lockup on CPU#0, init/1, ffff81011e9d3160

    Call Trace:
    [<ffffffff802eca20>] _raw_spin_lock+0xca/0xe8
    [<ffffffff80265d6d>] vma_adjust+0x218/0x442
    [<ffffffff80265d6d>] vma_adjust+0x218/0x442
    [<ffffffff8026646b>] vma_merge+0x10c/0x195
    [<ffffffff802671d5>] do_mmap_pgoff+0x3f5/0x790
    [<ffffffff803f6e84>] _spin_unlock_irq+0x24/0x27
    [<ffffffff8020ead0>] sys_mmap+0xe5/0x110
    [<ffffffff80209cce>] system_call+0x7e/0x83

    To recap:
    1. No problems with slub on CONFIG_SMP=n & CONFIG_PROVE_LOCKING=n
    2. Problem with slub on CONFIG_SMP=n & CONFIG_PROVE_LOCKING=y (perhaps a. some
    locking issue when slub is activated or b. something is wrong with 'prove
    locking' mechanism when slub is activated or c. something else I don't see)
    3. Problem with slub on CONFIG_SMP=y (even without CONFIG_PROVE_LOCKING=y)

    Thanks



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