On 13.03.2015 08:23, Carsten Emde wrote:
(About 30 OSADL QA Farm systems are now running 3.18.9-rt4. BTW: To check out what kernels are under test you may sort the kernel list (https://www.osadl.org/?id=933) by kernel version (https://www.osadl.org/?id=1001) and scroll down the page.)
The most striking problem of kernel 3.18.9-rt4 affects all systems that are equipped with Radeon graphics (irrespective whether PCIe cards or APUs with on-chip graphics). They suffer from a hanging radeon driver. The block occurs when accelerated graphics load is created by x11perf or gltestperf. Sometimes only the graphics are frozen while ssh login still is possible, somtimes the entire box is no longer accessible at all. In any case, a reboot is needed to recover from this situation.
Here is a selection of kernel messages:
[...]
The commits from http://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-fixes&id=f95706... to http://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-fixes&id=cffefd... and http://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-fixes&id=b66101... might help for this.