[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 53.524824][ T26] audit: type=1800 audit(1573674314.481:25): pid=8573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 53.563349][ T26] audit: type=1800 audit(1573674314.481:26): pid=8573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 53.597909][ T26] audit: type=1800 audit(1573674314.481:27): pid=8573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 62.905612][ T8731] [drm:drm_calc_timestamping_constants] *ERROR* crtc 32: Can't calculate constants, dotclock = 0! [ 62.917162][ C0] ------------[ cut here ]------------ [ 62.922760][ C0] WARNING: CPU: 0 PID: 8731 at drivers/gpu/drm/vkms/vkms_crtc.c:23 vkms_vblank_simulate+0x33a/0x3c0 [ 62.933509][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 62.940119][ C0] CPU: 0 PID: 8731 Comm: syz-executor019 Not tainted 5.4.0-rc7+ #0 executing program [ 62.948006][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.958062][ C0] Call Trace: [ 62.961342][ C0] [ 62.964223][ C0] dump_stack+0x197/0x210 [ 62.968560][ C0] ? vkms_vblank_simulate+0x280/0x3c0 [ 62.973935][ C0] panic+0x2e3/0x75c [ 62.977845][ C0] ? add_taint.cold+0x16/0x16 [ 62.982531][ C0] ? printk+0xba/0xed [ 62.986524][ C0] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 62.991986][ C0] ? __warn.cold+0x14/0x35 [ 62.996410][ C0] ? __warn+0xd9/0x1d0 [ 63.000488][ C0] ? vkms_vblank_simulate+0x33a/0x3c0 [ 63.005860][ C0] __warn.cold+0x2f/0x35 [ 63.010207][ C0] ? report_bug.cold+0x63/0xad [ 63.014979][ C0] ? vkms_vblank_simulate+0x33a/0x3c0 [ 63.020355][ C0] report_bug+0x289/0x300 [ 63.024693][ C0] do_error_trap+0x11b/0x200 [ 63.029293][ C0] do_invalid_op+0x37/0x50 [ 63.033716][ C0] ? vkms_vblank_simulate+0x33a/0x3c0 [ 63.039098][ C0] invalid_op+0x23/0x30 [ 63.043262][ C0] RIP: 0010:vkms_vblank_simulate+0x33a/0x3c0 [ 63.049242][ C0] Code: a1 00 00 00 49 8b 94 24 50 02 00 00 4c 89 f1 bf 02 00 00 00 48 c7 c6 c0 30 03 88 e8 b0 99 b5 ff e9 dd fe ff ff e8 36 0d 7e fd <0f> 0b e9 7e fd ff ff e8 3a 6f b9 fd e9 f4 fd ff ff 48 8b 7d d0 e8 [ 63.068849][ C0] RSP: 0018:ffff8880ae809dd0 EFLAGS: 00010006 [ 63.074919][ C0] RAX: ffff8880a84da700 RBX: ffff8882192d16e8 RCX: ffffffff83f54835 [ 63.082903][ C0] RDX: 0000000000010000 RSI: ffffffff83f54aba RDI: 0000000000000007 [ 63.090880][ C0] RBP: ffff8880ae809e08 R08: ffff8880a84da700 R09: ffff8880a84daf90 [ 63.098853][ C0] R10: fffffbfff138cef8 R11: ffffffff89c677c7 R12: 0000000000032fdf [ 63.106829][ C0] R13: ffff8882192d1740 R14: ffff8882192d0be8 R15: 0000000000000000 [ 63.114824][ C0] ? vkms_vblank_simulate+0xb5/0x3c0 [ 63.120122][ C0] ? vkms_vblank_simulate+0x33a/0x3c0 [ 63.125513][ C0] __hrtimer_run_queues+0x364/0xe40 [ 63.130721][ C0] ? vkms_disable_vblank+0x20/0x20 [ 63.135846][ C0] ? hrtimer_init+0x330/0x330 [ 63.140526][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 63.146264][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 63.152341][ C0] hrtimer_interrupt+0x314/0x770 [ 63.157297][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 63.162847][ C0] apic_timer_interrupt+0xf/0x20 [ 63.167776][ C0] [ 63.170725][ C0] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 [ 63.177143][ C0] Code: 48 c7 c0 20 24 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 12 dc a2 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 4c fd fe f9 65 8b 05 dd b5 b1 78 [ 63.196751][ C0] RSP: 0018:ffff88809ad4f920 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 63.205176][ C0] RAX: 1ffffffff11e6484 RBX: 0000000000000282 RCX: 0000000000000000 [ 63.213153][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000282 [ 63.221134][ C0] RBP: ffff88809ad4f930 R08: ffff8880a84da700 R09: 0000000000000000 [ 63.229113][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8882192d02f0 [ 63.237092][ C0] R13: 0000000000000000 R14: ffff8882192d02f0 R15: ffff8882195a3d08 [ 63.245096][ C0] drm_vblank_get+0x150/0x1e0 [ 63.249793][ C0] drm_wait_vblank_ioctl+0x51a/0x1990 [ 63.255431][ C0] ? drm_dev_exit+0x22/0x60 [ 63.259955][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 63.266030][ C0] ? lock_downgrade+0x920/0x920 [ 63.270890][ C0] ? lock_acquire+0x190/0x410 [ 63.275572][ C0] ? drm_dev_alloc+0xd0/0xd0 [ 63.280179][ C0] drm_ioctl_kernel+0x244/0x300 [ 63.285039][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 63.291106][ C0] ? drm_setversion+0x8c0/0x8c0 [ 63.295964][ C0] ? __might_fault+0x1a3/0x1e0 [ 63.300730][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 63.306977][ C0] drm_ioctl+0x54e/0xa60 [ 63.311230][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 63.317308][ C0] ? drm_ioctl_kernel+0x300/0x300 [ 63.322333][ C0] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 63.328149][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.334396][ C0] ? drm_ioctl_kernel+0x300/0x300 [ 63.339421][ C0] do_vfs_ioctl+0xdb6/0x13e0 [ 63.344024][ C0] ? ioctl_preallocate+0x210/0x210 [ 63.349141][ C0] ? kmem_cache_free+0x26b/0x320 [ 63.354085][ C0] ? putname+0xf4/0x130 [ 63.358246][ C0] ? do_sys_open+0x31d/0x5d0 [ 63.362847][ C0] ? tomoyo_file_ioctl+0x23/0x30 [ 63.367878][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.374125][ C0] ? security_file_ioctl+0x8d/0xc0 [ 63.379244][ C0] ksys_ioctl+0xab/0xd0 [ 63.383405][ C0] __x64_sys_ioctl+0x73/0xb0 [ 63.388004][ C0] do_syscall_64+0xfa/0x760 [ 63.392513][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.398404][ C0] RIP: 0033:0x445a69 [ 63.402417][ C0] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 63.422054][ C0] RSP: 002b:00007ffcd4045458 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 63.430478][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445a69 [ 63.438454][ C0] RDX: 0000000000008001 RSI: 0000000000004b3a RDI: 0000000000000006 [ 63.446431][ C0] RBP: 0000000000000000 R08: 0000000000402c90 R09: 0000000000402c90 [ 63.454406][ C0] R10: 0000000000402c90 R11: 0000000000000246 R12: 0000000000402c00 [ 63.462388][ C0] R13: 0000000000402c90 R14: 0000000000000000 R15: 0000000000000000 [ 63.471886][ C0] Kernel Offset: disabled [ 63.476263][ C0] Rebooting in 86400 seconds..