On 3/5/21 4:22 AM, Greg Kroah-Hartman wrote: > Ben Hutchings <ben@xxxxxxxxxxxxxxx> > futex: Futex_unlock_pi() determinism > Hi Ben, This particular commit above eventually triggered the following warning below, this was not caught in my initial testing of the v4.9.260 kernel, when I gave my Tested-by tag. This appears to be easily reproducible upon initialization of one of the modules being loaded for that test. Are there additional changes that we are missing in linux-4.9.y with respect to futex code? [ 233.128367] ------------[ cut here ]------------ [ 233.133104] WARNING: CPU: 3 PID: 1845 at kernel/futex.c:1584 do_futex+0x800/0x974 [ 233.140707] Modules linked in: wakeup_drv(O) nexus(PO) brcmv3d(O) [ 233.146950] [ 233.148511] CPU: 3 PID: 1845 Comm: nx_sched_idle_s Tainted: P O 4.9.261-1.22 #1 [ 233.157072] Hardware name: BCX972180SV (DT) [ 233.161326] task: ffffffc075e12e00 task.stack: ffffffc073110000 [ 233.167328] PC is at do_futex+0x800/0x974 [ 233.171410] LR is at do_futex+0x784/0x974 [ 233.175490] pc : [<ffffff800810f468>] lr : [<ffffff800810f3ec>] pstate: 600001c5 [ 233.183003] sp : ffffffc073113d10 [ 233.186380] x29: ffffffc073113d10 x28: 0000000000000000 [ 233.191800] x27: 0000000000000735 x26: ffffffc073113df8 [ 233.197220] x25: ffffffc07401bc90 x24: 0000000080000735 [ 233.202638] x23: ffffffc073110000 x22: 0000000000000000 [ 233.208055] x21: 000000000c0cd220 x20: ffffffc07401bc80 [ 233.213472] x19: 0000000000000001 x18: 0000000000000000 [ 233.218890] x17: 0000007f82b8dfe8 x16: ffffff800810f5dc [ 233.224309] x15: 00000b1a97b40980 x14: 0033240a01207260 [ 233.229727] x13: 00000000604b3cb0 x12: 0000000000000018 [ 233.235144] x11: 000000000636eae9 x10: 00000000000000e9 [ 233.240562] x9 : 003b9aca00000000 x8 : 0000000000000062 [ 233.245979] x7 : 0000000000014e26 x6 : 0000000000000000 [ 233.251396] x5 : ffffffc07401bcb8 x4 : 0000000000000000 [ 233.256814] x3 : 0000000000000001 x2 : 0000000000000000 [ 233.262230] x1 : 0000000000000000 x0 : ffffff8008cdf7dd [ 233.267644] [ 233.269192] ---[ end trace 18db5bc47ae34623 ]--- [ 233.273877] Call trace: [ 233.276389] Exception stack(0xffffffc073113b10 to 0xffffffc073113c40) [ 233.282913] 3b00: 0000000000000001 0000007fffffffff [ 233.290873] 3b20: ffffffc073113d10 ffffff800810f468 00000000600001c5 000000000000003d [ 233.298833] 3b40: ffffffc07401bc90 ffffffc073113df8 000000000c0cd220 0000000000000735 [ 233.306791] 3b60: ffffffc073113bd0 ffffff800810e004 0000000000000000 ffffffc073113cd0 [ 233.314751] 3b80: 000000000c0cd220 ffffffc073110000 0000000000000000 ffffffc073113cd0 [ 233.322711] 3ba0: 0000000000000000 ffffffc076b65bc0 ffffffc073113bd0 ffffff800810e1a4 [ 233.330670] 3bc0: 0000000000000000 00000000000409ff ffffffc073113d10 00000000000409ff [ 233.338628] 3be0: ffffff8008cdf7dd 0000000000000000 0000000000000000 0000000000000001 [ 233.346586] 3c00: 0000000000000000 ffffffc07401bcb8 0000000000000000 0000000000014e26 [ 233.354545] 3c20: 0000000000000062 003b9aca00000000 00000000000000e9 000000000636eae9 [ 233.362506] [<ffffff800810f468>] do_futex+0x800/0x974 [ 233.367638] [<ffffff800810f738>] SyS_futex+0x15c/0x184 [ 233.372861] [<ffffff8008083180>] el0_svc_naked+0x34/0x38 -- Florian
