How to debug system freeze?

[Łukasz Sowa]

> 
> Hm, sounds like a bug during suspend. Perhaps you can do "strace
> pm-suspend". And/or enable CONFIG_DETECT_SOFTLOCKUP. And hopefully you
> can pinpoint the related syscall or kernel instruction that leads to
> the bug
> 

It's not that easy. The problem occurs only when I'm going to suspend
with closing laptop's lid and it does not happen every time (but mostly
yes). I'll try to enable CONFIG_DETECT_SOFTLOCKUP but if it's hard
freeze, will I see the output?

Regards,
Lukasz Sowa