On 19/07/2016:04:29:07 PM, Alexandre Belloni wrote: > Hi, > > On 18/07/2016 at 17:17:44 +0530, Pratyush Anand wrote : > > Hi RTC-Maintainers, > > > > > > On Mon, Jul 4, 2016 at 9:49 PM, Pratyush Anand <pan...@redhat.com> wrote: > > > On 27/06/2016:10:19:07 AM, Pratyush Anand wrote: > > >> On 21/06/2016:10:25:34 AM, Pratyush Anand wrote: > > >> > We have observed on few machines with rtc-cmos device that > > >> > hpet_rtc_interrupt() is called before cmos_do_probe() could call > > >> > hpet_rtc_timer_init(). It has not been observed during normal > > >> > boot/reboot > > >> > of machines. It *sometime* happens when system is booted with kdump > > >> > secondary kernel. So, neither hpet_default_delta nor hpet_t1_cmp is > > >> > initialized by the time interrupt is raised in the given situation. > > >> > Therefore while loop of hpet_cnt_ahead() in hpet_rtc_timer_reinit() > > >> > never > > >> > completes. This leads to "NMI watchdog: Watchdog detected hard LOCKUP > > >> > on > > >> > cpu 0". > > >> > > > >> > I am still clueless, how can an interrupt be raised before RTC is > > >> > enabled. > > >> > But i do not have any idea about this device, so I am putting this > > >> > patch as > > >> > RFC to get feedback from hpet/rtc-cmos developer. I am sure there > > >> > would be > > >> > some better solution than this. > > >> > > >> Do you think that if I improve commit log of patches as pointed by > > >> Thomas and > > >> send a formal version of these patches, then they should acceptable to > > >> upstream? > > > > > > A gentle reminder for your comment/feedback :-) > > > > Please let me know how to make progress on this. If you think, there > > could be some better way to handle this issue then please let me know. > > If you need any more data then also please let me know. > > > > Well, the change is x86 specific and I don't know much about HPET so > until you get an ack from the x86 maintainers, I guess I can't help > much.
Thanks Alexandre for your reply. Thomas, Ingo, Peter, Your comment/feedback will be very helpful to make progress on this. ~Pratyush
