------------[ cut here ]------------ WARNING: CPU: 0 PID: 27106 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: 27106 Comm: syz-executor.1 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540 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 00 60 b3 88 e8 4c 2c ad ff e9 e5 fe ff ff e8 02 d8 11 fd <0f> 0b e9 88 fd ff ff e8 a6 3c 51 fd e9 11 fe ff ff 4c 89 ef e8 99 RSP: 0018:ffffc90000007da8 EFLAGS: 00010046 RAX: 0000000000010001 RBX: ffff88821807d888 RCX: ffffffff8461e253 RDX: ffff88804afa8580 RSI: ffffffff8461e4ce RDI: 0000000000000007 RBP: 000000000004b8f1 R08: 0000000000000001 R09: ffff88804afa8e48 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88821807cd38 R13: 0000000000000000 R14: ffff88821807d888 R15: dffffc0000000000 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [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 88 e0 b4 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d e3 52 cc 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 35 e5 66 f9 65 8b 05 fe 70 19 78 RSP: 0018:ffffc90004c67b00 EFLAGS: 00000282 RAX: 1ffffffff1369c11 RBX: 0000000000000282 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff88821807c390 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000282 R14: ffff88821807c390 R15: ffff8880a2ae0950 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline] drm_vblank_get+0x147/0x1d0 drivers/gpu/drm/drm_vblank.c:1157 drm_wait_vblank_ioctl+0x3bd/0x1980 drivers/gpu/drm/drm_vblank.c:1778 drm_ioctl_kernel+0x220/0x2e0 drivers/gpu/drm/drm_ioctl.c:787 drm_ioctl+0x4d2/0x96f drivers/gpu/drm/drm_ioctl.c:887 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c369 Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f388db09c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000c200 RCX: 000000000045c369 RDX: 00000000200000c0 RSI: 00000000c018643a RDI: 0000000000000006 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fffb6c00bbf R14: 00007f388db0a9c0 R15: 000000000078bf0c Kernel Offset: disabled Rebooting in 86400 seconds..