Messages in this thread | | | Date | Fri, 22 Aug 2003 08:39:03 +0200 | From | Hannes Reinecke <> | Subject | Re: Dumb question: BKL on reboot ? |
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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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