Messages in this thread | | | Date | Mon, 12 Nov 2007 15:26:29 -0500 | From | Dave Jones <> | Subject | Re: Kernel panic at boot with ondemand governor as default (2.6.24-rc2) |
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On Mon, Nov 12, 2007 at 04:23:09PM +0100, Thomas Renninger wrote: > On Mon, 2007-11-12 at 15:02 +0100, Eric Piel wrote: > > 11/12/2007 10:16 AM, Thomas Renninger wrote/a écrit: > > > On Sun, 2007-11-11 at 20:10 +0100, Eric Piel wrote: > > >> Hello, > > >> > > >> I've tried kernel 2.6.24-rc2 and I have a problem with the new option > > >> for setting up the cpufreq ondemand governor as default: a kernel panic > > >> happens early at boot time. If I boot first with performance governor > > >> and later change to ondemand, everything is fine (as usual). > > >> > > >> This seems related to the delayed_workqueue. The kernel panic message > > >> finishes by: > > >> EIP: [<c012aa60>] wq_per_cpu+0x0/0x10 SS:ESP 0068:c191be58 > > >> Kernel panic - not syncing: Attempted to kill init! > > >> > > >> A picture of the whole message is available here: > > >> http://pieleric.free.fr/unorder/1162-ondemand-panic.jpg > > >> > > >> My computer is a x86 using speedstep-ich, and you can find the full > > >> .config leading to the panic attached. > > >> > > >> Does anyone has any idea was it going wrong? > > > > > > Does it work if you compile speedstep-ich as a module? > > > If you load it, ondemand governor should still be set up automatically. > > > If this works, could it be that the kernel does not like that > > > queue_delayed_work_on is called that early? > > > > Yes, it works if I compile speedstep-ich as module. I've put the module > > in initramfs and as soon it is loaded, the ondemand governor is selected > > and works. > > > > However, do you think it's ok to prevent cpufreq drivers to be built-in > > if ondemand governor is selected as default? > > Another way would be to > > reorganise the initialisation code so that workqueue is initialised > > before the cpufreq framework is started, do you think it's possible? > Making all this work with low-level drivers built in would be perfect of > course... > If nobody answers the next days, could you open a bug at > bugzilla.kernel.org, so that this does not get lost, pls. > Add myself and Venkatesh to CC... > I try to have a look at it ASAP. > If someone already finds out more, this would be great.
I'm actually surprised that speedstep-ich works with a low enough latency for ondemand. On the kernel that works, can you boot with cpufreq.debug=7 and send the cpufreq messages from dmesg?
Dave
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