current->kmsan.in_runtime: -1, last_caller:           (null)
------------[ cut here ]------------
kernel BUG at mm/kmsan/kmsan_instr.c:267!
invalid opcode: 0000 [#1] SMP
CPU: 1 PID: 29860 Comm: kvm-pit/2897 Not tainted 4.20.0-rc7+ #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__msan_poison_alloca+0x29c/0x2a0 mm/kmsan/kmsan_instr.c:267
Code: 0b e8 e8 ee 7b ff 85 c0 75 20 48 8b 44 24 08 8b b0 88 09 00 00 48 8b 90 80 09 00 00 48 c7 c7 4e 72 5f 8b 31 c0 e8 f4 1b 7c ff <0f> 0b 66 90 55 48 89 e5 41 57 41 56 41 54 53 48 83 ec 18 65 48 8b
RSP: 0018:ffff88821fd0f9a0 EFLAGS: 00010046
RAX: 000000000000003c RBX: ffff8881dc58bc00 RCX: 73929194c854cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88821fd36abc
RBP: ffff88821fd0fa38 R08: 0000000000000000 R09: ffff88821fd38f10
R10: 0000000000000000 R11: ffffffff861d8220 R12: ffff88821fd0fa60
R13: 0000000000000046 R14: 0000000000000001 R15: ffffffff8ba9b6f0
FS:  0000000000000000(0000) GS:ffff88821fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e123000 CR3: 000000007aeef000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 _raw_spin_lock_irqsave+0x4d/0x170 kernel/locking/spinlock.c:151
 __wake_up_common_lock+0x10f/0x3a0 kernel/sched/wait.c:120
 __wake_up+0x4a/0x60 kernel/sched/wait.c:145
 drm_handle_vblank+0x229/0x730 drivers/gpu/drm/drm_vblank.c:1714
 drm_crtc_handle_vblank+0x8a/0xb0 drivers/gpu/drm/drm_vblank.c:1750
 _vblank_handle drivers/gpu/drm/vkms/vkms_crtc.c:20 [inline]
 vkms_vblank_simulate+0x98/0x4f0 drivers/gpu/drm/vkms/vkms_crtc.c:49
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0xbfc/0x15c0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x458/0x1380 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt+0x7c/0x260 arch/x86/kernel/apic/apic.c:1034
 smp_apic_timer_interrupt+0x3e/0x70 arch/x86/kernel/apic/apic.c:1061
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:814
 </IRQ>
RIP: 0010:_raw_spin_unlock_irqrestore+0x4b/0x70 kernel/locking/spinlock.c:185
Code: 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 28 48 89 df e8 98 6c 4a f7 c6 00 00 c6 03 00 4d 85 e4 75 1c 4c 89 7d d8 ff 75 d8 9d <48> 83 c4 08 5b 41 5c 41 5e 41 5f 5d c3 e8 83 76 4a f7 eb d1 44 89
RSP: 0018:ffff88807b86fe30 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: ffff888079c7f848 RBX: ffff88807a57f848 RCX: ffff888079c7f848
RDX: ffff88807b8bf848 RSI: 0000160000000000 RDI: ccccccccccccd000
RBP: ffff88807b86fe58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff8169e0b0 R12: 0000000000000000
R13: ffff88807a57f840 R14: 0000000000000000 R15: 0000000000000286
 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline]
 complete+0x10e/0x170 kernel/sched/completion.c:37
 kthread+0x3c6/0x4e0 kernel/kthread.c:240
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
Modules linked in:
---[ end trace ed0345b9a7384ccb ]---
RIP: 0010:__msan_poison_alloca+0x29c/0x2a0 mm/kmsan/kmsan_instr.c:267
Code: 0b e8 e8 ee 7b ff 85 c0 75 20 48 8b 44 24 08 8b b0 88 09 00 00 48 8b 90 80 09 00 00 48 c7 c7 4e 72 5f 8b 31 c0 e8 f4 1b 7c ff <0f> 0b 66 90 55 48 89 e5 41 57 41 56 41 54 53 48 83 ec 18 65 48 8b
RSP: 0018:ffff88821fd0f9a0 EFLAGS: 00010046
RAX: 000000000000003c RBX: ffff8881dc58bc00 RCX: 73929194c854cf00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88821fd36abc
RBP: ffff88821fd0fa38 R08: 0000000000000000 R09: ffff88821fd38f10
R10: 0000000000000000 R11: ffffffff861d8220 R12: ffff88821fd0fa60
R13: 0000000000000046 R14: 0000000000000001 R15: ffffffff8ba9b6f0
FS:  0000000000000000(0000) GS:ffff88821fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e123000 CR3: 000000007aeef000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400