<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [BAT] igt@gem_ctx_create@basic-files - Softdog Incomplete - BUG kmalloc-8192 (Tainted: G U ): Padding overwritten. 0xffff88016a93e742-0xffff88016a93e77f" href="https://bugs.freedesktop.org/show_bug.cgi?id=103642#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [BAT] igt@gem_ctx_create@basic-files - Softdog Incomplete - BUG kmalloc-8192 (Tainted: G U ): Padding overwritten. 0xffff88016a93e742-0xffff88016a93e77f" href="https://bugs.freedesktop.org/show_bug.cgi?id=103642">bug 103642</a> from <a class="email" href="mailto:marta.lofstedt@intel.com" title="Marta Löfstedt <marta.lofstedt@intel.com>"> Marta Löfstedt</a> <pre>(In reply to Chris Wilson from <a href="show_bug.cgi?id=103642#c2">comment #2</a>) > One random memcorruption 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">https://patchwork.freedesktop.org/patch/msgid/20171213094802.28243-1</a>- > <a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a> > > Hopefully this explains a lot of weirdness. I still see a lot of weirdness from the GLK-DSI machine. Chris, if you want to close this bug feel free. I just wanted not file this 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="show_bug.cgi?id=103514">bug 103514</a>, since this looked extra weird enough to deserve its own bug.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>