Hi, Ingo,
I am looking the source code of function softlockup_tick()
137 /* Warn about unreasonable delays: */
138 if (now <= (touch_timestamp + softlockup_thresh))
139 return;
140
141 per_cpu(print_timestamp, this_cpu) = touch_timestamp;
142
143 spin_lock(&print_lock);
144 printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for
%lus! [%s:%d]\n",
145 this_cpu, now - touch_timestamp,
146 current->comm, task_pid_nr(current));
147 print_modules();
148 print_irqtrace_events(current);
149 if (regs)
150 show_regs(regs);
151 else
152 dump_stack();
153 spin_unlock(&print_lock);
154
155 if (softlockup_panic)
156 panic("softlockup: hung tasks");
my kernel is kdb patched kernel, and it looks like if I stay in kdb
for more than 60 seconds, I will receive a warning about softlockup
when I leave kdb. it is very annoying to see the warning message
especially in SMP environment, sometimes this could even hung the
machine. A simple way here is:
#ifdef CONFIG_KDB
not trigger softlockup or set softlockup_thresh to be a very high value.
#elseif
trigger softlockup if CPU stuck for more than 60 seconds
#endif
However I feel this approach is far from perfect. Do you have any
advice on how to avoid this warning?
Regards
Jason
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