Hi,
In systems with vcpu > 1, a BUG due to a detected soft lockup seems to be 
triggered after system resume/suspend. This is probably due to the lack of 
seqlocking around the region that does the local time processing. 
The following patch fix this.
-- 
Glauber de Oliveira Costa
Red Hat Inc.
"Free as in Freedom"

--- linux-2.6.18-orig/arch/i386/kernel/time-xen.c 2006年10月06日 
14:37:41.000000000 -0400
+++ linux-2.6.18.x86_64/arch/i386/kernel/time-xen.c 2006年10月09日 
17:13:54.000000000 -0400
@@ -666,6 +666,13 @@ irqreturn_t timer_interrupt(int irq, voi
 clock_was_set();
 }
 
+ /* Local timer processing (see update_process_times()). */
+ run_local_timers();
+ if (rcu_pending(cpu))
+ rcu_check_callbacks(cpu, user_mode(regs));
+ scheduler_tick();
+ run_posix_cpu_timers(current); 
+
 write_sequnlock(&xtime_lock);
 
 /*
@@ -709,13 +716,6 @@ irqreturn_t timer_interrupt(int irq, voi
 (cputime_t)delta_cpu);
 }
 
- /* Local timer processing (see update_process_times()). */
- run_local_timers();
- if (rcu_pending(cpu))
- rcu_check_callbacks(cpu, user_mode(regs));
- scheduler_tick();
- run_posix_cpu_timers(current);
-
 return IRQ_HANDLED;
 }
 

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