On Wed, Dec 12, 2007 at 10:11:44AM +0100, Ingo Molnar wrote: > 2.6.24-rc4-git5, got this cpufreq crash on x86 64-bit, during 'make > randconfig' random bootup testing:
You hit all the fun bugs. Just before we initialise cpufreqs notifier list.. > Testing NMI watchdog ... <4>WARNING: CPU#0: NMI appears to be stuck (0->0)! eek? > powernow-k8: Found 1 AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ > processors (1 cpu cores) (version 2.20.00) > powernow-k8: BIOS error - no PSB or ACPI _PSS objects > ------------[ cut here ]------------ > kernel BUG at drivers/cpufreq/cpufreq.c:1060! The actual BUG you hit is if (unlikely(lock_policy_rwsem_write(cpu))) BUG(); It _looks_ like we're leaking a refcount on that lock, but I don't see where. It's a shame you can't reproduce this easily, as cpufreq.debug=7 would give us more clues. (And CONFIG_CPUFREQ_DEBUG=y) I'll think about this some more. Dave -- http://www.codemonkey.org.uk -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/