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    SubjectRe: 2.6.22.1-rt4 lockups
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    On Sat, 2007-07-21 at 23:07 +0100, Rui Nuno Capela wrote:

    > Call Trace:
    > [<c010622a>] show_trace_log_lvl+0x1a/0x30
    > [<c01062f6>] show_stack_log_lvl+0xb6/0xe0
    > [<c0106521>] show_registers+0x201/0x330
    > [<c0106768>] die+0x118/0x260
    > [<c0304233>] do_page_fault+0x193/0x600
    > [<c030294a>] error_code+0x72/0x78
    > [<c011b4af>] activate_task+0x4f/0xb0
    > [<c011e09d>] try_to_wake_up+0x2bd/0x420
    > [<c011e279>] wake_up_process_mutex+0x19/0x20
    > [<c01425cc>] wakeup_next_waiter+0xec/0x1a0
    > [<c030173c>] rt_spin_lock_slowunlock+0x4c/0x70
    > [<c0301ff6>] rt_spin_unlock+0x26/0x30
    > [<c015b3e4>] put_zone_pcp+0x14/0x20
    > [<c015c265>] get_page_from_freelist+0x145/0x380
    > [<c015c4f4>] __alloc_pages+0x54/0x2d0
    > [<c01652bd>] __handle_mm_fault+0x7dd/0x9a0
    > [<c0304398>] do_page_fault+0x2f8/0x600
    > [<c030294a>] error_code+0x72/0x78
    > =======================

    I was able to reproduce a similar looking hang when I combine kernbench
    running with another load (I used ltpstress.sh from LTP) ..

    I'm debugging it now ..

    Daniel

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