<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [BAT] [GLK-DSI only] igt@gem_* - Failed assertion: !"GPU hung" - and its aftermath" href="https://bugs.freedesktop.org/show_bug.cgi?id=103514#c33">Comment # 33</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [BAT] [GLK-DSI only] igt@gem_* - Failed assertion: !"GPU hung" - and its aftermath" href="https://bugs.freedesktop.org/show_bug.cgi?id=103514">bug 103514</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>One random memcorruption issue fixed: commit 7d622351c94172a42bfe9b13bdb0fdc2be90ed3b Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Date: Wed Dec 13 09:48:02 2017 +0000 drm/i915/fence: Use rcu to defer freeing of irq_work It is illegal to perform an immediate free of the struct irq_work from inside the irq_work callback (as irq_work_run_list modifies work->flags after execution of the work->func()). As we use the irq_work to coordinate the freeing of the callback from two different softirq paths, we need to defer the kfree from inside our irq_work callback, for which we can use kfree_rcu. Fixes: 81c0ed21aa91 ("drm/i915/fence: Avoid del_timer_sync() from inside a timer") Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Cc: Tvrtko Ursulin <<a href="mailto:tvrtko.ursulin@intel.com">tvrtko.ursulin@intel.com</a>> Cc: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>> Reviewed-by: Tvrtko Ursulin <<a href="mailto:tvrtko.ursulin@intel.com">tvrtko.ursulin@intel.com</a>> Link: <a href="https://patchwork.freedesktop.org/patch/msgid/20171213094802.28243-1-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20171213094802.28243-1-chris@chris-wilson.co.uk</a> Hopefully this explains a lot of weirdness.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>