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Dave C Boutcher wrote: > On Tue, Jan 17, 2006 at 10:52:44AM -0600, Dave C Boutcher wrote: > > Well, it turns out that I've been running with CONFIG_DEBUG_MUTEXES all > > along...so no noise. My console output is a little different that > > Serge's, so I think this is timing related. Also note that I'm dying in > > the timer interrupt... > > duh... here's the backtrace > 0:mon> t > [c000000000577890] c0000000000034b4 decrementer_common+0xb4/0x100 > --- Exception: 901 (Decrementer) at c0000000004627ec > .__mutex_lock_interruptible_slowpath+0x3bc/0x4c4 > [c000000000577c60] c000000000075064 .__lock_cpu_hotplug+0x44/0xa8 > [c000000000577ce0] c000000000075600 .register_cpu_notifier+0x24/0x68 > [c000000000577d70] c00000000052cd7c .do_init_bootmem+0x68c/0xab0 > [c000000000577e50] c000000000522c84 .setup_arch+0x21c/0x2c0 > [c000000000577ef0] c00000000051a538 .start_kernel+0x40/0x280 > [c000000000577f90] c000000000008574 .hmt_init+0x0/0x8c The mutex debug code (debug_spin_unlock in kernel/mutex-debug.h) is doing a local_irq_enable way before we're ready. BTW: I couldn't build powerpc without mutex debugging until I changed the SYNC_ON_SMP in include/asm-powerpc/mutex.h:__mutex_fastpath_unlock to ISYNC_ON_SMP. With that change, I was able to boot semi-successfully with mutex debugging off -- the system got hung up when udev started, apparently (or maybe I was too impatient). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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