Messages in this thread | | | From | "Johan Kullstam" <> | Subject | Re: 2.4.7p6 hang | Date | 11 Jul 2001 20:17:48 -0400 |
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Andrea Arcangeli <andrea@suse.de> writes:
> On Wed, Jul 11, 2001 at 04:22:04PM +0200, Trond Myklebust wrote: > > >>>>> " " == Andrew Morton <andrewm@uow.edu.au> writes: > > > > > Trond Myklebust wrote: > > >> > > >> ... I have the same problem on my setup. To me, it looks like > > >> the loop in spawn_ksoftirqd() is suffering from some sort of > > >> atomicity problem. > > > > > Does a `set_current_state(TASK_RUNNING);' in spawn_ksoftirqd() > > > fix it? If so we have a rogue initcall... > > > > Nope. The same thing happens as before. > > > > A couple of debugging statements show that ksoftirqd_CPU0 gets created > > fine, and that ksoftirqd_task(0) is indeed getting set correctly > > before we loop in spawn_ksoftirqd(). > > After this the second call to kernel_thread() succeeds, but > > ksoftirqd() itself never gets called before the hang occurs. > > ksoftirqd is quite scheduler intensive, and while its startup is > correct (no need of any change there), it tends to trigger scheduler > bugs (one of those bugs was just fixed in pre5). The reason I never seen > the deadlock I also fixed this other scheduler bug in my tree: > > ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.7pre5aa1/00_sched-yield-1 > > this one I forgot to sumbit but here it is now for easy merging: > > --- 2.4.4aa3/kernel/sched.c.~1~ Sun Apr 29 17:37:05 2001 > +++ 2.4.4aa3/kernel/sched.c Tue May 1 16:39:42 2001 > @@ -674,8 +674,10 @@ > #endif > spin_unlock_irq(&runqueue_lock); > > - if (prev == next) > + if (prev == next) { > + current->policy &= ~SCHED_YIELD; > goto same_process; > + } > > #ifdef CONFIG_SMP > /*
thank you.
this patch fixes things for me too.
i was freezing at boot, right after the kernel prints the line Initializing RT netlink. with both 2.4.7-pre5 and 2.4.7-pre6.
after applying this to 2.4.7-pre6, things are working fine (afaict after just a few minutes...).
-- J o h a n K u l l s t a m [kullstam@ne.mediaone.net] Don't Fear the Penguin! - 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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