On Thu, May 11, 2017 at 02:12:39PM -0600, Jens Axboe wrote: > On 05/10/2017 09:13 PM, Paul E. McKenney wrote: > > On Wed, May 10, 2017 at 08:55:54PM -0600, Jens Axboe wrote: > >> On 05/10/2017 04:34 PM, Paul E. McKenney wrote: > >>> Hello! > >>> > >>> I got the lockdep splat shown below during some rcutorture testing (which > >>> does CPU hotplug operations) on mainline at commit dc9edaab90de ("Merge > >>> tag 'acpi-extra-4.12-rc1' of git://git.kernel.org/.../rafael/linux-pm"). > >>> My kneejerk reaction was just to reverse the "mutex_lock(&all_q_mutex);" > >>> and "get_online_cpus();" in blk_mq_init_allocated_queue(), but then > >>> I noticed that commit eabe06595d62 ("block/mq: Cure cpu hotplug lock > >>> inversion") just got done moving these two statements in the other > >>> direction. > >> > >> The problem is that that patch got merged too early, as it only > >> fixes a lockdep splat with the cpu hotplug rework. Fix is coming Linus' > >> way, it's in my for-linus tree. > > > > Thank you for the update, looking forward to the fix. > > It's upstream now.
Thank you, Jens! I will test it this evening, Pacific Time. Thanx, Paul