Messages in this thread | | | From | Thomas Müller <> | Subject | disabling secondary CPU hangs / system fails to suspend with kernel 4.19+ | Date | Thu, 14 Mar 2019 16:17:28 +0100 |
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Hi,
starting with kernel 4.19 my Lenovo ThinkPad X1 Carbon 5th no longer properly suspends.
This is 100% reproducible and git bisect points to the following commit: > [be45bf5395e0886a93fc816bbe41a008ec2e42e2] watchdog/softlockup: Fix cpu_stop_queue_work() double-queue bug > be45bf5395e0886a93fc816bbe41a008ec2e42e2 is the first bad commit > commit be45bf5395e0886a93fc816bbe41a008ec2e42e2 > Author: Peter Zijlstra <peterz@infradead.org> > Date: Fri Jul 13 12:42:08 2018 +0200 > > watchdog/softlockup: Fix cpu_stop_queue_work() double-queue bug > > When scheduling is delayed for longer than the softlockup interrupt > period it is possible to double-queue the cpu_stop_work, causing list > corruption. > > Cure this by adding a completion to track the cpu_stop_work's > progress. > > Reported-by: kernel test robot <lkp@intel.com> > Tested-by: Rong Chen <rong.a.chen@intel.com> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Cc: Linus Torvalds <torvalds@linux-foundation.org> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Thomas Gleixner <tglx@linutronix.de> > Fixes: 9cf57731b63e ("watchdog/softlockup: Replace "watchdog/%u" threads with cpu_stop_work") > Link: http://lkml.kernel.org/r/20180713104208.GW2494@hirez.programming.kicks-ass.net > Signed-off-by: Ingo Molnar <mingo@kernel.org> > > :040000 040000 6aca2dbb84bc33fe442b18b3d0a135c27adff7b9 2710af12d32e4b98df07768716689b213bce45fc M kernel
The bugzilla reports have some additional details: * https://bugzilla.redhat.com/show_bug.cgi?id=1671504 * https://bugzilla.kernel.org/show_bug.cgi?id=202679 * https://bugzilla.kernel.org/show_bug.cgi?id=202137
I'm happy to provide additional information or test a patch or two (as long as it doesn't eat up my notebook ;))
Best regards Thomas
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