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    SubjectRe: Dumb question: BKL on reboot ?
    Andrea Arcangeli wrote:
    > On Thu, Aug 21, 2003 at 05:55:49PM +0200, Hannes Reinecke wrote:
    >
    >>Andrea Arcangeli wrote:
    >>
    >>>On Thu, Aug 21, 2003 at 10:05:20AM +0200, Hannes Reinecke wrote:
    >>
    >>
    >>
    >>What happened was this:
    >>
    >>================================================================
    >>TASK HAS CPU (0): 0x904000 (kupdated):
    >> LOWCORE INFO:
    >> -psw : 0x400100180000000 0x0000000007aa22
    >> -function : sync_old_buffers+58
    >> -prefix : 0x009c8000
    >> -cpu timer: 0xfffffa77 0x33465f80
    >> -clock cmp: 0x00b9e503 0x235324f4
    >> -general registers:
    >> 0000000000000000 0x000000002e1000
    >> 0x0000000007aa22 0x0000000004919e
    >> 0x00000000907f28 0x0000000022b428
    >> 0000000000000000 0000000000000000
    >> 0x00000000224340 0000000000000000
    >> 0x00000000970000 0x00000000233b00
    >> 0x00000000904000 0x000000001deb60
    >> 0x00000000907e78 0x00000000907dd8
    >>[ .. ]
    >> STACK:
    >> 0 kupdate+424 [0x7af4c]
    >> 1 arch_kernel_thread+70 [0x18d72]
    >>================================================================
    >>TASK HAS CPU (1): 0x3318000 (reboot):
    >> LOWCORE INFO:
    >> -psw : 0x700100180000000 0x0000007ffe0d8e
    >> -function : not found in System map
    >> -prefix : 0x009c2000
    >> -cpu timer: 0xfff79e2d 0x014244c0
    >> -clock cmp: 0x00b9e503 0x3a5d9504
    >> -general registers:
    >> 0x00000000000001 0000000000000000
    >> 0000000000000000 0000000000000000
    >> 0x0000000001f268 0000000000000000
    >> 0x00000000000003 0x000000000002c0
    >> 0x000000000490f0 0x00000003318000
    >> 0x00000000016422 0000000000000000
    >> 0x00000000000001 0x000000001da280
    >> 0x0000000001f268 0x0000000331bae0
    >>[ .. ]
    >> STACK:
    >> 0 machine_restart_smp+62 [0x1f5f2]
    >> 1 machine_restart+48 [0x19884]
    >> 2 sys_reboot+306 [0x49222]
    >> 3 sysc_noemu+16 [0x16242]
    >
    >
    > This can't be the lock_kernel, you see, there's no lock_kernel
    > invocation at all in the machine_restart_smp path.

    Oh? sys_reboot() does call lock_kernel(). kernel/sys.c:303.

    Agreed, this smp_processor_id() == 0 thing is interesting. I'll try you
    suggestion and see how far I'll progress.

    Cheers,

    Hannes
    --
    Dr. Hannes Reinecke hare@suse.de
    SuSE Linux AG S390 & zSeries
    Deutschherrnstr. 15-19 +49 911 74053 688
    90429 Nürnberg http://www.suse.de

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