FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/debug commit 9746e3d5bec266d90f15655292a96e18f17af05c ("sched: Add missing update_rq_clock() call for task_hot().") in testcase: trinity with following parameters: runtime: 300s Trinity is a linux system call fuzz tester. on test machine: qemu-system-x86_64 -enable-kvm -smp 2 -m 320M caused below changes: +---------------------------------------------------+------------+------------+ | | d0a6beea3c | 9746e3d5be | +---------------------------------------------------+------------+------------+ | boot_successes | 2 | 97 | | boot_failures | 199 | 91 | | WARNING:at_kernel/sched/sched.h:#can_migrate_task | 199 | | | calltrace:smpboot_thread_fn | 14 | | | calltrace:oom_reaper | 59 | | | invoked_oom-killer:gfp_mask=0x | 3 | 1 | | Mem-Info | 3 | 1 | | calltrace:rescuer_thread | 7 | | | calltrace:crypto_wq_init | 1 | | | calltrace:schedule_timeout | 13 | | | calltrace:hugepage_init | 6 | | | calltrace:schedule | 8 | | | calltrace:rcu_gp_slow | 2 | | | calltrace:kcompactd | 1 | | | calltrace:genhd_device_init | 1 | | | WARNING:at_kernel/sched/sched.h:#set_next_entity | 0 | 42 | | calltrace:torture_shuffle | 0 | 42 | | BUG:kernel_reboot-without-warning_in_test_stage | 0 | 48 | +---------------------------------------------------+------------+------------+ [ 27.840606] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX [ 27.939831] 8021q: adding VLAN 0 to HW filter on device eth0 [ 28.538009] ------------[ cut here ]------------ [ 28.538821] WARNING: CPU: 0 PID: 34 at kernel/sched/sched.h:797 set_next_entity+0xe2/0x100 [ 28.540490] rq->clock_update_flags < RQCF_ACT_SKIP [ 28.541277] CPU: 0 PID: 34 Comm: torture_shuffle Not tainted 4.8.0-00077-g9746e3d #1 [ 28.542546] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 28.543999] 00000086 00000086 cf42fe34 c15db96d cf42fe78 c21015ec cf42fe64 c105de22 [ 28.545459] c21015c4 cf42fe94 00000022 c21015ec 0000031d c10992d2 0000031d cf508960 [ 28.547026] d37ff774 00000000 cf42fe80 c105de79 00000009 00000000 cf42fe78 c21015c4 [ 28.548496] Call Trace: [ 28.548917] [<c15db96d>] dump_stack+0x76/0xa9 [ 28.549662] [<c105de22>] __warn+0xf2/0x110 [ 28.550353] [<c10992d2>] ? set_next_entity+0xe2/0x100 [ 28.551212] [<c105de79>] warn_slowpath_fmt+0x39/0x40 [ 28.552054] [<c10992d2>] set_next_entity+0xe2/0x100 [ 28.552880] [<c109931f>] set_curr_task_fair+0x2f/0x40 [ 28.553739] [<c1086d8d>] do_set_cpus_allowed+0x13d/0x180 [ 28.554635] [<c1087203>] __set_cpus_allowed_ptr+0xe3/0x220 [ 28.555557] [<c114f438>] ? torture_shuffle+0xe8/0x260 [ 28.556401] [<c108734f>] set_cpus_allowed_ptr+0xf/0x20 [ 28.557280] [<c114f45e>] torture_shuffle+0x10e/0x260 [ 28.558125] [<c114f350>] ? torture_kthread_stopping+0x90/0x90 [ 28.559088] [<c107cff6>] kthread+0xa6/0xc0 [ 28.559791] [<c1db1a62>] ret_from_kernel_thread+0xe/0x24 [ 28.560683] [<c107cf50>] ? __kthread_parkme+0x80/0x80 [ 28.561531] ---[ end trace 111ecdb503ae986d ]--- [ 29.952494] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Xiaolong