On Fri, Sep 08, 2023 at 01:27:06AM -0700, Paul E. McKenney wrote: > On Thu, Sep 07, 2023 at 08:51:43PM -0400, Joel Fernandes wrote: > > On Thu, Sep 7, 2023 at 4:03 PM Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> wrote: > > > > > > > > > > > > > On Sep 7, 2023, at 12:23 PM, Paul E. McKenney <paulmck@xxxxxxxxxx> wrote: > > > > > > > > On Thu, Sep 07, 2023 at 09:17:15AM -0400, Joel Fernandes wrote: > > > >> Hi, > > > >> Just started seeing this on 6.5 stable. It is new and first occurrence: > > > >> > > > >> TREE04 no success message, 234 successful version messages > > > >> [033mWARNING: [mTREE04 GP HANG at 14 torture stat 2 > > > >> [ 38.371120] ??? Writer stall state RTWS_COND_SYNC_FULL(10) g1253 > > > >> f0x0 ->state 0x2 cpu 6 > > > >> [ 38.388342] Call Trace: > > > >> [ 53.741039] ??? Writer stall state RTWS_COND_SYNC_FULL(10) g3637 > > > >> f0x2 ->state 0x2 cpu 6 > > > >> [ 69.093462] ??? Writer stall state RTWS_COND_SYNC_FULL(10) g5501 > > > >> f0x0 ->state 0x2 cpu 6 > > > >> [ 84.450028] ??? Writer stall state RTWS_COND_SYNC_FULL(10) g10505 > > > >> f0x0 ->state 0x2 cpu 6 > > > >> [ 99.815871] ??? Writer stall state RTWS_COND_SYNC_FULL(10) g13781 > > > >> f0x0 ->state 0x2 cpu 6 > > > >> [ 115.166476] ??? Writer stall state RTWS_COND_SYNC_FULL(10) g16544 > > > >> f0x0 ->state 0x2 cpu 6 > > > >> [ 130.550116] ??? Writer stall state RTWS_COND_SYNC_FULL(10) g18941 > > > >> f0x0 ->state 0x2 cpu 6 > > > >> [..] > > > >> > > > >> All logs: > > > >> http://box.joelfernandes.org:9080/job/rcutorture_stable/job/linux-6.5.y/17/artifact/tools/testing/selftests/rcutorture/res/2023.09.07-04.10.25/TREE04/ > > > > > > > > Huh. Does this happen for you in v6.5 mainline? > > > > > > > > Both the code under test (full-state polled grace periods) and the > > > > rcutorture test code are fairly new, so there is some reason for general > > > > suspicion. ;-) > > > > > > Ah. I never saw it on either 6.5 mainline or stable till today. Even on stable > > > I only ever saw it this once. On mainline I have not seen it yet but I do test > > > stable much more since I have been on stable maintenance duty ;-). > > > > I did a couple of long runs and I am not able to reproduce it anymore. :-/ > > I know that feeling! Same here, this is after all the reason why we keep the tick dependency within the hotplug process without really knowing why :o)
