------------[ cut here ]------------
WARNING: CPU: 0 PID: 9241 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x31e/0x3b0 drivers/gpu/drm/vkms/vkms_crtc.c:21
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9241 Comm: syz-executor.1 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x27b/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 fixup_bug arch/x86/kernel/traps.c:170 [inline]
 do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:vkms_vblank_simulate+0x31e/0x3b0 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 85 9e 00 00 00 48 8b 95 48 02 00 00 4c 89 e1 bf 02 00 00 00 48 c7 c6 60 15 92 88 e8 9c b9 ae ff e9 e5 fe ff ff e8 c2 e7 17 fd <0f> 0b e9 88 fd ff ff e8 76 ae 55 fd e9 11 fe ff ff 4c 89 ef e8 69
RSP: 0018:ffffc90000007dd8 EFLAGS: 00010006
RAX: ffff888061aec580 RBX: ffff888027b25830 RCX: ffffffff845b49c3
RDX: 0000000000010000 RSI: ffffffff845b4c3e RDI: 0000000000000007
RBP: 0000000000065994 R08: ffff888061aec580 R09: fffffbfff15128a9
R10: ffffffff8a894547 R11: fffffbfff15128a8 R12: ffff888027b24ce0
R13: 0000000000000000 R14: ffff88802ce29780 R15: ffff88802ce29700
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x1ce/0xed0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x8c/0xe0 kernel/locking/spinlock.c:191
Code: 48 c7 c0 20 c2 94 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d db b0 c4 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 65 f3 7e f9 65 8b 05 66 0d 32 78
RSP: 0018:ffffc90004687b58 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1329844 RBX: 0000000000000282 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000282
RBP: ffff888027b24338 R08: ffff888061aec580 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000282 R14: ffff888027b24338 R15: ffff888023cd3928
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 drm_vblank_get+0x149/0x1d0 drivers/gpu/drm/drm_vblank.c:1101
 drm_wait_vblank_ioctl+0x3e3/0x1780 drivers/gpu/drm/drm_vblank.c:1722
 drm_ioctl_kernel+0x220/0x2f0 drivers/gpu/drm/drm_ioctl.c:787
 compat_drm_wait_vblank+0xd6/0x190 drivers/gpu/drm/drm_ioc32.c:856
 drm_compat_ioctl+0x1e6/0x300 drivers/gpu/drm/drm_ioc32.c:993
 __do_compat_sys_ioctl fs/ioctl.c:857 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:808 [inline]
 __ia32_compat_sys_ioctl+0x23d/0x2b0 fs/ioctl.c:808
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Kernel Offset: disabled
Rebooting in 86400 seconds..