------------[ cut here ]------------ WARNING: CPU: 0 PID: 8857 at drivers/gpu/drm/vkms/vkms_crtc.c:23 vkms_vblank_simulate+0x33a/0x3c0 drivers/gpu/drm/vkms/vkms_crtc.c:23 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8857 Comm: syz-executor540 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028 RIP: 0010:vkms_vblank_simulate+0x33a/0x3c0 drivers/gpu/drm/vkms/vkms_crtc.c:23 Code: a1 00 00 00 49 8b 94 24 50 02 00 00 4c 89 f1 bf 02 00 00 00 48 c7 c6 a0 a4 03 88 e8 50 89 b5 ff e9 dd fe ff ff e8 b6 6c 7c fd <0f> 0b e9 7e fd ff ff e8 4a aa b8 fd e9 f4 fd ff ff 48 8b 7d d0 e8 RSP: 0018:ffff8880ae809dd0 EFLAGS: 00010006 RAX: ffff8880998e42c0 RBX: ffff8880a38056e8 RCX: ffffffff83f7a145 RDX: 0000000000010000 RSI: ffffffff83f7a3ca RDI: 0000000000000007 RBP: ffff8880ae809e08 R08: ffff8880998e42c0 R09: ffff8880998e4b50 R10: fffffbfff138ed40 R11: ffffffff89c76a07 R12: 0000000000072163 R13: ffff8880a3805740 R14: ffff8880a3804be8 R15: 0000000000000000 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:191 Code: 48 c7 c0 60 2f f3 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d 62 8a 9c 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 9c 58 f9 f9 65 8b 05 ed 58 ab 78 RSP: 0018:ffff888094ad7b08 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11e65ec RBX: 0000000000000286 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000286 RBP: ffff888094ad7b18 R08: ffff8880998e42c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a38042f0 R13: 0000000000000000 R14: ffff8880a38042f0 R15: ffff888219314908 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline] drm_vblank_get+0x150/0x1e0 drivers/gpu/drm/drm_vblank.c:1015 drm_wait_vblank_ioctl+0x51a/0x1990 drivers/gpu/drm/drm_vblank.c:1636 drm_ioctl_kernel+0x244/0x300 drivers/gpu/drm/drm_ioctl.c:786 compat_drm_wait_vblank+0xd6/0x190 drivers/gpu/drm/drm_ioc32.c:856 drm_compat_ioctl+0x1eb/0x310 drivers/gpu/drm/drm_ioc32.c:993 __do_compat_sys_ioctl fs/compat_ioctl.c:1049 [inline] __se_compat_sys_ioctl fs/compat_ioctl.c:995 [inline] __ia32_compat_sys_ioctl+0x195/0x620 fs/compat_ioctl.c:995 do_syscall_32_irqs_on arch/x86/entry/common.c:333 [inline] do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:404 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f58a39 Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ffca6f8c EFLAGS: 00000213 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c018643a RDX: 0000000020000100 RSI: 00000000080ef078 RDI: 00000000ffca6fe0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..