Re: How to debug system freeze?
On Fri, Feb 24, 2012 at 1:22 AM, Łukasz Sowa luk...@gmail.com wrote: Hi, I'm experiencing strange bug when I close lid of my laptop - system freezes (no reaction on keys, no response form ssh) hard and displays some strange colour effects. The kernel log (after reboot) shows nothing. My question is - how to debug it? Maybe there's a way to track last called kernel function or something similar? Maybe you can try the pm_test framework (see Documentation/power/basic-pm- debugging.txt) to narrow down the problem. Regards, Srivatsa S. Bhat ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: How to debug system freeze?
Thanks Mulyadi, Hi Lukasz :) On Sat, Feb 25, 2012 at 07:17, Łukasz Sowa luk...@gmail.com wrote: 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? not everytime...ok that makes situation harder. Maybe you need serial console and hook another computer to see the kernel log. I'll try to dump memory using FireWire because that's only useful port I have in my laptop. Is that ok? Regards, Lukasz Sowa ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: How to debug system freeze?
Hi Lukasz :) On Mon, Feb 27, 2012 at 08:31, Łukasz Sowa luk...@gmail.com wrote: I'll try to dump memory using FireWire because that's only useful port I have in my laptop. Is that ok? I can't tell for sure, but that sounds feasible. Good luck -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: How to debug system freeze?
Hi Lukasz :) On Sat, Feb 25, 2012 at 07:17, Łukasz Sowa luk...@gmail.com wrote: 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? not everytime...ok that makes situation harder. Maybe you need serial console and hook another computer to see the kernel log. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: How to debug system freeze?
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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
How to debug system freeze?
Hi, I'm experiencing strange bug when I close lid of my laptop - system freezes (no reaction on keys, no response form ssh) hard and displays some strange colour effects. The kernel log (after reboot) shows nothing. My question is - how to debug it? Maybe there's a way to track last called kernel function or something similar? Thanks, Lukasz Sowa ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
