Messages in this thread | | | Date | Mon, 14 Aug 2006 14:46:52 -0700 | From | Andrew Morton <> | Subject | Re: 2.6.18-rc4-mm1 |
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On Mon, 14 Aug 2006 16:20:04 -0400 Dave Jones <davej@redhat.com> wrote:
> On Mon, Aug 14, 2006 at 01:55:56PM +0200, Ben Buxton wrote: > > > > > Also, whenever I echo anything to "scaling_governor", I get the > > > > following kernel message: > > > > > > > > [ 734.156000] BUG: warning at kernel/cpu.c:38/lock_cpu_hotplug() > > > > [ 734.156000] [<c013c3ec>] lock_cpu_hotplug+0x7c/0x90 > > > > [ 734.156000] [<c01327f4>] __create_workqueue+0x44/0x140 > > > > [ 734.156000] [<c02dcf7b>] mutex_lock+0xb/0x20 > > > > [ 734.156000] [<e01f2665>] cpufreq_governor_dbs+0x2b5/0x310 [cpufreq_ondemand] > > > > > > This makes no sense at all, because in -mm __create_workqueue doesn't > > > call lock_cpu_hotplug(). > > > > > > Are you sure this was from a tree with -mm1 applied ? > > > > Definitely 2.6.18-rc4-mm1, and I've done a clean rebuild + removal of > > all modules under /lib/modules beforehand. > > It's a real mystery. Andrew ? >
I'm suspecting it's just stack gunk. If Ben could send some more such traces that'd clear things up. Also, turning on CONFIG_UNWIND_INFO, CONFIG_STACK_UNWIND and perhaps CONFIG_FRAME_POINTER might give us a cleaner backtrace.
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