FYI, we noticed the following commit (built with gcc-7): commit: bae397f6e7d17448fa1a8b87c1d58e6dbb77f42a ("[patch part-II V2 09/13] x86/entry/common: Split hardirq tracing into lockdep and ftrace parts") url: https://github.com/0day-ci/linux/commits/Thomas-Gleixner/x86-entry-Consolidation-Part-II-syscalls/20200309-072900 in testcase: trinity with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ 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): +----------------------------------------------------+------------+------------+ | | e03ca08c94 | bae397f6e7 | +----------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 12 | 12 | | BUG:workqueue_lockup-pool | 7 | 6 | | BUG:kernel_in_stage | 12 | 12 | | BUG:soft_lockup-CPU##stuck_for#s![dma-fence:#:#] | 3 | 1 | | RIP:lock_is_held_type | 3 | | | Kernel_panic-not_syncing:softlockup:hung_tasks | 3 | 1 | | WARNING:at_kernel/sched/cputime.c:#get_vtime_delta | 0 | 11 | | RIP:get_vtime_delta | 0 | 11 | | RIP:kthread_should_stop | 0 | 1 | +----------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 15.999846] WARNING: CPU: 0 PID: 199 at kernel/sched/cputime.c:259 get_vtime_delta+0x62/0xe0 [ 15.999846] Modules linked in: [ 15.999846] CPU: 0 PID: 199 Comm: modprobe Not tainted 5.5.0-rc5-00015-gbae397f6e7d17 #1 [ 15.999846] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 15.999846] RIP: 0010:get_vtime_delta+0x62/0xe0 [ 15.999846] Code: 85 f6 75 28 8b 88 20 07 00 00 85 c9 74 1e 80 3d 87 bd b0 01 00 75 15 48 c7 c7 60 79 53 b5 c6 05 77 bd b0 01 01 e8 be 41 fd ff <0f> 0b e9 02 00 00 00 eb 31 31 ff e8 ee b8 f1 ff 66 90 48 2b 05 5d [ 15.999846] RSP: 0018:ffff8dcad803fea0 EFLAGS: 00010086 [ 15.999846] RAX: 000000000000001d RBX: 000000000000080c RCX: 0000000000000000 [ 15.999846] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 15.999846] RBP: ffff8dcb36fea938 R08: 0000000000000001 R09: 0000000000000001 [ 15.999846] R10: 0000000000000001 R11: ffff8dcad803fd50 R12: ffff8dcb36fea938 [ 15.999846] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 15.999846] FS: 0000000000000000(0000) GS:ffffffffb5851000(0000) knlGS:0000000000000000 [ 15.999846] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 15.999846] CR2: 00007fdf8f4e10e8 CR3: 0000000236ff4000 CR4: 00000000000406f0 [ 15.999846] Call Trace: [ 15.999846] vtime_user_exit+0x3f/0x90 [ 15.999846] ? __context_tracking_exit+0x42/0xe0 [ 15.999846] __context_tracking_exit+0x42/0xe0 [ 15.999846] do_syscall_64+0x4a/0x5c0 [ 15.999846] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 15.999846] RIP: 0033:0x7fdf8f2d69cc [ 15.999846] Code: f3 c3 49 8d 50 01 41 c6 00 00 eb f1 66 90 50 58 bf 7f 00 00 00 48 83 ec 08 e8 30 0e 00 00 b9 0c 00 00 00 48 89 fe 89 c8 0f 05 <48> 3d 00 f0 ff ff 48 89 c2 77 29 48 89 05 ca a6 20 00 31 c0 48 39 [ 15.999846] RSP: 002b:00007ffe3de63fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000000c [ 15.999846] RAX: ffffffffffffffda RBX: 0000000000400040 RCX: 00007fdf8f2d69cc [ 15.999846] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 15.999846] RBP: 0000000000000009 R08: 000000000000037f R09: 0000000000000064 [ 15.999846] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe3de64259 [ 15.999846] R13: 0000000000000000 R14: 0000000000402625 R15: 0000000000001000 [ 15.999846] irq event stamp: 272 [ 15.999846] hardirqs last enabled at (271): [] trace_hardirqs_on_thunk+0x1a/0x1c [ 15.999846] hardirqs last disabled at (272): [] vprintk_emit+0xf7/0x320 [ 15.999846] softirqs last enabled at (114): [] __do_softirq+0x343/0x37d [ 15.999846] softirqs last disabled at (109): [] irq_exit+0x50/0x80 [ 15.999846] ---[ end trace 7b8a309e4ee96050 ]--- To reproduce: # build kernel cd linux cp config-5.5.0-rc5-00015-gbae397f6e7d17 .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, Rong Chen