FYI, we noticed the following commit (built with gcc-7): commit: 5acb72bc5642be30e358f43eaa010d06a6ea29e7 ("timer: Warn about schedule_timeout() called for tasks in TASK_RUNNING state") https://github.com/0day-ci/linux/commits/Alexander-Popov/timer-Warn-about-schedule_timeout-called-for-tasks-in-TASK_RUNNING-state/20200117-180155 in testcase: blktests with following parameters: disk: 1SSD test: block-group1 on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +--------------------------------------------------+------------+------------+ | | a67ca893ae | 5acb72bc56 | +--------------------------------------------------+------------+------------+ | boot_successes | 9 | 3 | | boot_failures | 0 | 9 | | WARNING:at_kernel/time/timer.c:#schedule_timeout | 0 | 9 | | RIP:schedule_timeout | 0 | 9 | +--------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 9.394278] WARNING: CPU: 1 PID: 1 at kernel/time/timer.c:1892 schedule_timeout+0x254/0x340 [ 9.395601] Modules linked in: ip_tables [ 9.396169] CPU: 1 PID: 1 Comm: systemd Not tainted 5.5.0-rc5-00071-g5acb72bc5642b #1 [ 9.397240] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 9.398362] RIP: 0010:schedule_timeout+0x254/0x340 [ 9.399021] Code: 08 00 41 89 c6 e9 a4 fe ff ff 80 3d 41 7a d4 00 00 0f 85 15 fe ff ff 48 c7 c7 28 99 f3 8c c6 05 2d 7a d4 00 01 e8 9c 81 5e ff <0f> 0b e9 fb fd ff ff 4d 89 ec e9 ec fe ff ff e8 38 b9 61 ff 48 c7 [ 9.400914] RSP: 0018:ffffa8fc80013d38 EFLAGS: 00010282 [ 9.401492] RAX: 0000000000000000 RBX: 000000000000752f RCX: 0000000000000000 [ 9.402222] RDX: 0000000000000001 RSI: ffff96be3fd19b38 RDI: ffff96be3fd19b38 [ 9.402956] RBP: ffff96bdd0f58000 R08: 0000000000000258 R09: 0000000000000030 [ 9.403687] R10: 000000000000077b R11: ffffa8fc80013bd8 R12: 0000000000000000 [ 9.404421] R13: ffff96bdd0f58208 R14: ffff96be3fd38a20 R15: 0000000000000001 [ 9.405163] FS: 00007f1abe5ec680(0000) GS:ffff96be3fd00000(0000) knlGS:0000000000000000 [ 9.406057] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9.406672] CR2: 0000563498ad1294 CR3: 00000001d0d52000 CR4: 00000000000406e0 [ 9.407404] Call Trace: [ 9.407764] ? prepare_to_wait_event+0x99/0x190 [ 9.408287] tty_wait_until_sent+0x157/0x1a0 [ 9.408790] ? finish_wait+0x80/0x80 [ 9.409238] tty_port_close_start+0x11e/0x1b0 [ 9.409798] tty_port_close+0x27/0x60 [ 9.410242] tty_release+0x124/0x600 [ 9.410680] __fput+0xd1/0x270 [ 9.411079] task_work_run+0xa3/0xe0 [ 9.411525] exit_to_usermode_loop+0xeb/0xf0 [ 9.412022] do_syscall_64+0x1c6/0x1f0 [ 9.412475] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 9.413045] RIP: 0033:0x7f1ac02325b1 [ 9.413517] Code: 2d aa 00 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 8b 05 9a ee 00 00 85 c0 75 16 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 3f c3 66 0f 1f 44 00 00 53 89 fb 48 83 ec 10 [ 9.415390] RSP: 002b:00007ffed608ea98 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 9.416243] RAX: 0000000000000000 RBX: 0000000000000029 RCX: 00007f1ac02325b1 [ 9.416975] RDX: 0000000000000005 RSI: 00007ffed608eaf0 RDI: 0000000000000029 [ 9.417718] RBP: 00007f1abe5ec460 R08: 000000000000fce0 R09: 0000563498acc700 [ 9.418452] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 [ 9.419186] R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000030 [ 9.419924] ---[ end trace 029e41b457dc5ff5 ]--- To reproduce: # build kernel cd linux cp config-5.5.0-rc5-00071-g5acb72bc5642b .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, lkp