"Li, Aubrey" <aubrey...@linux.intel.com> writes: > On 2020/7/1 5:32, Vineeth Remanan Pillai wrote: > > We saw a lot of soft lockups on the screen when we tested v6. > > [ 186.527883] watchdog: BUG: soft lockup - CPU#86 stuck for 22s! [uperf:5551] > [ 186.535884] watchdog: BUG: soft lockup - CPU#87 stuck for 22s! [uperf:5444] > [ 186.555883] watchdog: BUG: soft lockup - CPU#89 stuck for 22s! [uperf:5547] > [ 187.547884] rcu: INFO: rcu_sched self-detected stall on CPU > [ 187.553760] rcu: 40-....: (14997 ticks this GP) > idle=49a/1/0x4000000000000002 softirq=1711/1711 fqs=7279 > [ 187.564685] NMI watchdog: Watchdog detected hard LOCKUP on cpu 14 > [ 187.564723] NMI watchdog: Watchdog detected hard LOCKUP on cpu 38 > > The problem is gone when we reverted this patch. We are running multiple > uperf threads(equal to cpu number) in a cgroup with coresched enabled. > This is 100% reproducible on our side.
ROTFL. I just predicted that from staring at the patch ....
