Created attachment 128580 [details]
gpu crash dump
Dec 19 17:23:25 tom3 kernel: [5217537.820042] [drm] stuck on render ring
Dec 19 17:23:25 tom3 kernel: [5217537.821077] [drm] GPU HANG: ecode 0:0x8644f8fe, in chromium , reason: Ring hung, action: reset
Dec 19 17:23:25 tom3 kernel: [5217537.821079] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
Dec 19 17:23:25 tom3 kernel: [5217537.821081] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Dec 19 17:23:25 tom3 kernel: [5217537.821083] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
Dec 19 17:23:25 tom3 kernel: [5217537.821084] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
Dec 19 17:23:25 tom3 kernel: [5217537.821086] [drm] GPU crash dump saved to /sys/class/drm/card0/error
debian jessie versions
Jessie is quite old wrt to graphics drivers and I know that several gen4 hangs have been fixed in mesa circa 11.0.
OK, will reportbug to debian.
Tried to reproduce with chromium for 2h now, but occurs no more.
Needs reboot to reactivate xv,gl,etc videoplayback, mplayer crashes since the hung.
Please verify that this bug reproduces with debian stretch before reporting anything to debian. It's likely that the root cause of your GPU hang has already been addressed.