Hi, I've been following this thread with some interrest because my mythtv based media centre suffered from sudden freezes. I thought I had tried everything to solve the problem (including exchanging hardware) until I caught the slashdot article discussing this bug. I was running on 3.17.3 and and experienced daily freezes while watching DVB-C recorded H.264 (HD) video, both live and pre-recorded streams. Both using VAAPI GPU accelaration and CPU decoding. Ever since downgrading to 3.16.7 my system has been solid as a rock again.
The load on this machine is marginal. Most playback is done using GPU and other than that, the main load is hammering at most 2 HD (1G/10mins) streams to SSD. When idle, the system crawls DVB channels for EPG info. Crashes happened mostly while watching TV and ~5 minutes after a background recording started or after a couple of hours watching live TV, but were very hard to trigger. When freezing the system was completely inaccessible, without any panic logging on (ssh remote connected) console. I have never been able to find any evidence in old logs after reboot. The freezes happened both with and without NMI watchdog enabled. Hardware is J1900 BayTrail (ValleyView) based ASRock miniITX board. The DVB-C card requires out-of-tree built ddbridge drivers (~endriss/media_build_expermintal) so the kernels (both stable and unstable) are tainted I guess? I'm a moderately experienced Linux user. I do build my own kernels, but am not very knowledgable about the inner workings you guys are discussing here. The system is a (family) production device so there is not a lot of room for testing, let alone bisecting. I do now have a spare J1900 lying around, so there is opportunity to build a dedicated test system if needed. Hope this may help in finding the right direction for this bug? Regards, Martin -- If 'but' was any useful, it would be a logic operator -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
