Hello!
> in __write_lock_failed; there, EDI is c02d1f4c, which lies in irq_stat.
EAX is more useful, it points to lock.
This problem look different of described earlier. Now it is plain
deadlock, which is very easy to find.
> Hope this helps nailing it. I'll boot and go home now. Can try things
> tomorrow.
What a pity, since tomorrow I will be absent for week or so.
Try to apply the patch appended. It is BH watchdog, it does the
same thing as nmi watchdog, but catches softirq deadlocks.
I have no idea why standard kernel does not have this.
It will oops stuck cpu after 2 minutes.
Alexey
diff -ur ../vger3-000826/linux/kernel/timer.c linux/kernel/timer.c
--- ../vger3-000826/linux/kernel/timer.c Wed Aug 23 23:04:40 2000
+++ linux/kernel/timer.c Mon Aug 28 23:08:45 2000
@@ -670,8 +679,44 @@
calc_load(ticks);
}
+#ifndef NO_ANK_FIX
+
+static struct {
+ unsigned long jiffies;
+} bh_watchdog[NR_CPUS];
+
+static inline void do_bh_watchdog(struct pt_regs *regs)
+{
+ /* This assumes x86 timer behaviour. */
+ if ((long)(jiffies - bh_watchdog[smp_processor_id()].jiffies) <= 60*HZ)
+ return;
+
+ bh_watchdog[smp_processor_id()].jiffies = jiffies;
+
+ printk("BH watchdog on CPU%d\n", smp_processor_id());
+
+#ifndef __sparc__
+ if (1) {
+#ifdef __alpha__
+ extern void die_if_kernel(const char * str, struct pt_regs * regs, long err, unsigned long);
+ die_if_kernel("BH Watch Dog", regs, 0, 0);
+#else
+ extern void die(const char * str, struct pt_regs * regs, long err);
+ die("BH Watch Dog", regs, 0);
+#endif
+ printk("Killing %s, it does not help of course.\n", current->comm);
+ send_sig(SIGKILL, current, 1);
+ }
+#endif
+}
+#endif
+
+
void timer_bh(void)
{
+#ifndef NO_ANK_FIX
+ bh_watchdog[smp_processor_id()].jiffies = jiffies;
+#endif
update_times();
run_timer_list();
}
@@ -687,6 +732,9 @@
mark_bh(TIMER_BH);
if (tq_timer)
mark_bh(TQUEUE_BH);
+#ifndef NO_ANK_FIX
+ do_bh_watchdog(regs);
+#endif
}
#if !defined(__alpha__) && !defined(__ia64__)
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