Re: BUG: at kernel/sched.c:4031 __schedule()

On Thu, 2007-06-07 at 12:13 -0400, Steven Rostedt wrote:

On Thu, 2007-06-07 at 17:58 +0200, Jan Altenberg wrote:

quoted

Hi,

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in prepare_task_switch(rq, next); interrupts are enabled,

That's a bug.  __schedule should not have interrupts enabled.
What's the back trace of this?

I've also seen this in the past. Interrupts are enabled in
prepare_lock_switch because ARM defines __ARCH_WANT_INTERRUPTS_ON_CTXSW.

Heh, silly me.  I've been focused so much on x86 that I forgot what
other archs do.

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IIRC Thomas fixed this for the current -rt release.

Thomas, perhaps you want to post the fix.

What arch is innovator1510 (OMAP5910 cpu) anyway?

/me has been away from embedded systems for some time.

I was wrong, I guess it's still in there .. Below I think..

+ *
+ * The new debugging code in __schedule() expects that interrupts
+ * are disabled across a switch_to. Need to investigate which
+ * consequences this has.
  */
-#if 0 // preempt_rt hack, because warn_on in shedule.c triggers
+#ifndef CONFIG_PREEMPT_RT
 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
 #endif