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SubjectRe: 2.6.14-rc3-rt2
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On Tue, 2005-10-04 at 20:46 +0530, Dinakar Guniguntala wrote:
> On Tue, Oct 04, 2005 at 04:27:18PM +0200, Ingo Molnar wrote:
> >
> > > Hmm Ingo,
> > >
> > > Looks like -rt6 got rid of all the _nort defines, but it's still used
> > > throughout the kernel.
> >
> > yeah, -rt7 should fix this.
> >
>
>
> I get a lot of these with -rt7 (One every minute)
>
> BUG: auditd:3596, possible softlockup detected on CPU#3!
> [<c0144c48>] softlockup_detected+0x39/0x46 (8)
> [<c0144d26>] softlockup_tick+0xd1/0xd3 (20)
> [<c0111252>] smp_apic_timer_ipi_interrupt+0x4d/0x56 (24)
> [<c010396c>] apic_timer_ipi_interrupt+0x1c/0x24 (12)
> [<c0102e7f>] sysenter_past_esp+0x24/0x75 (44)


Woops, forgot to CC LKML ..

Index: linux-2.6.13/arch/i386/kernel/apic.c
===================================================================
--- linux-2.6.13.orig/arch/i386/kernel/apic.c
+++ linux-2.6.13/arch/i386/kernel/apic.c
@@ -1153,6 +1153,16 @@ fastcall notrace void smp_apic_timer_ipi
#if 0
profile_tick(CPU_PROFILING, regs);
#endif
+
+ /*
+ * If the task is currently running in user mode, don't
+ * detect soft lockups. If CONFIG_DETECT_SOFTLOCKUP is not
+ * configured, this should be optimized out.
+ */
+ if (user_mode(regs))
+ touch_light_softlockup_watchdog();
+
+
update_process_times(user_mode_vm(regs));
irq_exit();


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