On 2024-10-15 15:47:20 [+0800], kernel test robot wrote: > Hello, Hi, it took me a while to reproduce this because it does not trigger without the ltp userland and this is not downloaded properly so I had to workaround it. However… > [ 98.006999][ T543] busted-torture: rtc: 00000000639e821e ver: 6796 tfle: 0 rta: 6796 rtaf: 0 rtf: 6787 rtmbe: 1 rtmbkf: 0/0 rtbe: 0 rtbke: 0 rtbf: 0 rtb: 0 nt: 89 barrier: 0/0:0 read-exits: 64 nocb-toggles: 0:0 > [ 98.017386][ T543] busted-torture: !!! > [ 98.017662][ T543] ------------[ cut here ]------------ > [ 98.019330][ T543] WARNING: CPU: 0 PID: 543 at kernel/rcu/rcutorture.c:2258 rcu_torture_stats_print+0x24c/0x610 [rcutorture] > [ 98.021831][ T543] Modules linked in: rcutorture torture … > [ 98.237025][ T543] ------------[ cut here ]------------ > [ 98.238052][ T543] WARNING: CPU: 0 PID: 543 at kernel/rcu/rcutorture.c:2263 rcu_torture_stats_print+0x373/0x610 [rcutorture] > [ 98.240000][ T543] Modules linked in: rcutorture torture … It took me a while to figure out that this test is using rcu_busted_torture_deferred_free() which in turn invokes the callback before the grace period. Buh. So it looks like LAZY preempt triggers this more reliably than the normal preempt version… Sebastian
