------------[ cut here ]------------
WARNING: CPU: 1 PID: 5906 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x283/0x310 drivers/gpu/drm/vkms/vkms_crtc.c:41
Modules linked in:
CPU: 1 PID: 5906 Comm: syz-executor221 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x283/0x310 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 80 3c 02 00 0f 85 99 00 00 00 48 8b 95 b8 01 00 00 4c 89 e1 bf 02 00 00 00 48 c7 c6 40 e6 f2 88 e8 c2 21 f1 ff e9 1c ff ff ff <0f> 0b e9 0c fe ff ff e8 61 7f b3 fd e9 7a fe ff ff 4c 89 ef e8 54
RSP: 0000:ffffc90000db0e00 EFLAGS: 00010002
RAX: 00000000000000d6 RBX: ffff88801a2b9e48 RCX: 00000013c9a48d9f
RDX: 00000013c9a48d9f RSI: 7fffffffffffffff RDI: 00000013c8a6419f
RBP: ffff8880b9f42a80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000b9bb R12: 0000000000fe4c00
R13: ffff88801a2b8d40 R14: ffffffff83edaee0 R15: ffff8880b9f42a00
FS:  00005555560e4300(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b5c09f290 CR3: 000000002359f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x300/0x930 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:5340
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 92 f0 0f f9 e8 6d 21 37 f9 fb bf 01 00 00 00 <e8> 32 d1 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 90 de 0f
RSP: 0000:ffffc9000170f9f8 EFLAGS: 00000206
RAX: 0000000000000439 RBX: ffff888022ef5400 RCX: ffffffff8150b75e
RDX: 0000000000000000 RSI: ffffffff888afa60 RDI: 0000000000000001
RBP: ffffed10045dea80 R08: 0000000000000001 R09: ffffffff8e1617ff
R10: fffffbfff1c2c2ff R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_cond_resched kernel/entry/common.c:385 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:377 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:415
 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:634
RIP: 0010:dump_stack+0xc5/0xcc lib/dump_stack.c:126
Code: db 75 1b be 04 00 00 00 48 c7 c7 a0 1a 00 8b e8 2a da 9b f9 c7 05 50 c0 fa 02 ff ff ff ff 4d 85 e4 74 05 e8 06 b3 67 f9 55 9d <5b> 5d 41 5c 41 5d c3 ba 12 00 00 00 48 89 ee 48 c7 c7 60 99 e0 88
RSP: 0000:ffffc9000170fac8 EFLAGS: 00000286
RAX: 0000000000000437 RBX: 0000000000000000 RCX: ffffffff8150b75e
RDX: 0000000000000000 RSI: ffffffff888afa60 RDI: ffffffff88ddc5c0
RBP: 0000000000000286 R08: 0000000000000001 R09: ffffffff8e1617ff
R10: fffffbfff1c2c2ff R11: 0000000000000001 R12: 0000000000000200
R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 prepare_alloc_pages mm/page_alloc.c:4943 [inline]
 __alloc_pages_nodemask+0x189/0x730 mm/page_alloc.c:4985
 alloc_pages_vma+0xb1/0x5d0 mm/mempolicy.c:2230
 wp_page_copy+0x191/0x1ce0 mm/memory.c:2847
 handle_pte_fault mm/memory.c:4405 [inline]
 __handle_mm_fault mm/memory.c:4522 [inline]
 handle_mm_fault+0x2330/0x4520 mm/memory.c:4620
 do_user_addr_fault+0x2d3/0x930 arch/x86/mm/fault.c:1393
 handle_page_fault arch/x86/mm/fault.c:1450 [inline]
 exc_page_fault+0x60/0xc0 arch/x86/mm/fault.c:1506
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580
RIP: 0033:0x7f9b5bffba88
Code: 06 ff ff 64 48 8b 1c 25 10 00 00 00 48 39 1d 27 38 0a 00 74 23 64 8b 04 25 18 00 00 00 85 c0 0f 85 69 02 00 00 ba 01 00 00 00 <0f> b1 15 01 38 0a 00 48 89 1d 02 38 0a 00 8b 05 f8 37 0a 00 48 8b
RSP: 002b:00007ffe370fd210 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00005555560e4300 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000401ffc00c R11: 0000000000000246 R12: 00007f9b5c09e3f0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
----------------
Code disassembly (best guess):
   0:	55                   	push   %rbp
   1:	53                   	push   %rbx
   2:	65 48 8b 1c 25 00 f0 	mov    %gs:0x1f000,%rbx
   9:	01 00
   b:	48 89 dd             	mov    %rbx,%rbp
   e:	48 c1 ed 03          	shr    $0x3,%rbp
  12:	48 01 c5             	add    %rax,%rbp
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 92 f0 0f f9       	callq  0xf90ff0b1
  1f:	e8 6d 21 37 f9       	callq  0xf9372191
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 32 d1 ff ff       	callq  0xffffd161 <-- trapping instruction
  2f:	9c                   	pushfq
  30:	58                   	pop    %rax
  31:	fa                   	cli
  32:	f6 c4 02             	test   $0x2,%ah
  35:	75 27                	jne    0x5e
  37:	bf 01 00 00 00       	mov    $0x1,%edi
  3c:	e8                   	.byte 0xe8
  3d:	90                   	nop
  3e:	de 0f                	fimuls (%rdi)