> Our first victim!! :-) > No kidding!? > On Tue, 2005-04-05 at 20:06 +0100, Rui Nuno Capela wrote: >> > >> I'm having plenty of this on boot, on my SMP/HT desktop (P4/x86), while >> running RT-V0.7.44-01 (SMP+PREEMPT_RT): >> >> BUG: kstopmachine:xxxx RT task yield()-ing! >> >> See sample dmesg and .config on attach. >> >> OTOH, on my laptop (P4/UP), all seems to be clear fine. >> > > The kstopmachine is only run on SMP environments, so it won't show up on > your UP machine. > > >> Is this something to be affraid of? :) >> > > If your box is still running, then no. But it's now a chore to remove > the yield from this algorithm, since yields have a possibility to > deadlock the system. Although in this particular case, it may not be a > problem, since the threads that are being waited on are created for > other CPUs. But I haven't looked too much into what stop_machine is > doing so I can very well be wrong. > > Thank you for reporting it, we want to weed out all the yields that a RT > task may call. > Now, I'm sure my fears were reasonable. With RT-V0.7.44-02 SMP a can't even reach an usable system state. This weird BUG: kstopmachine:xxxx RT task yield()-ing! is flooding the init process to death. Completely. Hard-reset is the only viable solution to a fast scrolling console dump, which seems to be in a terrible, nasty and endless loop. I'm not afraid anymore. RT-0.7.44-02 is useless on my P4 SMP/HT desktop machine. ;) Bye. -- rncbc aka Rui Nuno Capela [email protected]
Attachment:
config-2.6.12-rc2-RT-V0.7.44-02.0smp.gz
Description: GNU Zip compressed data
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