Hi Jens, On Wed, 19 Nov 2008 10:43:00 +0100 Jens Axboe <jens.axboe@xxxxxxxxxx> wrote: > > On Wed, Nov 19 2008, Stephen Rothwell wrote: > > > > Unable to handle kernel paging request for data at address 0x00000000 > > Faulting instruction address: 0xc000000000503030 > > cpu 0x0: Vector: 300 (Data Access) at [c00000000ffffa40] > > pc: c000000000503030: ._spin_lock_irqsave+0x40/0x110 > > lr: c0000000002571f8: .blk_rq_timed_out_timer+0x48/0x190 > > sp: c00000000ffffcc0 > > msr: 8000000000009032 > > dar: 0 > > dsisr: 40000000 > > current = 0xc000000022d31040 > > paca = 0xc000000000897300 > > pid = 3399, comm = ckbcomp > > enter ? for help > > [c00000000ffffd50] c0000000002571f8 .blk_rq_timed_out_timer+0x48/0x190 > > [c00000000ffffe00] c00000000006c2f4 .run_timer_softirq+0x1c4/0x2a0 > > [c00000000ffffed0] c000000000065298 .__do_softirq+0xe8/0x1f0 > > [c00000000fffff90] c000000000029224 .call_do_softirq+0x14/0x24 > > [c000000022ad3c80] c00000000000d420 .do_softirq+0xf0/0x140 > > [c000000022ad3d20] c0000000000654a4 .irq_exit+0x74/0x90 > > [c000000022ad3da0] c000000000025844 .timer_interrupt+0x134/0x150 > > [c000000022ad3e30] c000000000003700 decrementer_common+0x100/0x180 > > --- Exception: 901 (Decrementer) at 000000000ff52440 > > That's even more weird, how could 'data' passed in to the timer ever be > 0? It's setup like this: 'data' above is generic, not a variable name. The 0 is probably the address of the spinlock (though I need to check more to be sure) as it crashed inside _spin_lock_irqsave. > setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q); > > when we allocate the queue. How did this trigger? Not sure what you mean? -- Cheers, Stephen Rothwell sfr@xxxxxxxxxxxxxxxx http://www.canb.auug.org.au/~sfr/
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