[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.429982][ T26] audit: type=1800 audit(1574819031.906:25): pid=8627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.451213][ T26] audit: type=1800 audit(1574819031.906:26): pid=8627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.486783][ T26] audit: type=1800 audit(1574819031.916:27): pid=8627 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 '10.128.1.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.336987][ T8780] [drm:drm_calc_timestamping_constants] *ERROR* crtc 32: Can't calculate constants, dotclock = 0! [ 73.348595][ C1] ------------[ cut here ]------------ [ 73.354136][ C1] WARNING: CPU: 1 PID: 8780 at drivers/gpu/drm/vkms/vkms_crtc.c:23 vkms_vblank_simulate+0x33a/0x3c0 [ 73.364871][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 73.371445][ C1] CPU: 1 PID: 8780 Comm: syz-executor141 Not tainted 5.4.0-syzkaller #0 [ 73.379884][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.389923][ C1] Call Trace: [ 73.393222][ C1] [ 73.396063][ C1] dump_stack+0x197/0x210 [ 73.400377][ C1] ? vkms_vblank_simulate+0x270/0x3c0 [ 73.405728][ C1] panic+0x2e3/0x75c [ 73.409651][ C1] ? add_taint.cold+0x16/0x16 [ 73.414307][ C1] ? printk+0xba/0xed [ 73.418268][ C1] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 73.423703][ C1] ? __warn.cold+0x14/0x35 [ 73.428099][ C1] ? __warn+0xd9/0x1d0 [ 73.432148][ C1] ? vkms_vblank_simulate+0x33a/0x3c0 [ 73.437501][ C1] __warn.cold+0x2f/0x35 [ 73.441724][ C1] ? report_bug.cold+0x63/0xad [ 73.446510][ C1] ? vkms_vblank_simulate+0x33a/0x3c0 [ 73.451873][ C1] report_bug+0x289/0x300 [ 73.456195][ C1] do_error_trap+0x11b/0x200 [ 73.460763][ C1] do_invalid_op+0x37/0x50 [ 73.465158][ C1] ? vkms_vblank_simulate+0x33a/0x3c0 [ 73.470507][ C1] invalid_op+0x23/0x30 [ 73.474639][ C1] RIP: 0010:vkms_vblank_simulate+0x33a/0x3c0 [ 73.480598][ C1] 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 [ 73.500181][ C1] RSP: 0018:ffff8880ae909dd0 EFLAGS: 00010006 [ 73.506240][ C1] RAX: ffff8880977a4000 RBX: ffff8880a38516e8 RCX: ffffffff83f7a145 [ 73.514190][ C1] RDX: 0000000000010000 RSI: ffffffff83f7a3ca RDI: 0000000000000007 [ 73.522141][ C1] RBP: ffff8880ae909e08 R08: ffff8880977a4000 R09: ffff8880977a4890 [ 73.530090][ C1] R10: fffffbfff138ed40 R11: ffffffff89c76a07 R12: 0000000000038344 [ 73.538053][ C1] R13: ffff8880a3851740 R14: ffff8880a3850be8 R15: 0000000000000000 [ 73.546030][ C1] ? vkms_vblank_simulate+0xb5/0x3c0 [ 73.551353][ C1] ? vkms_vblank_simulate+0x33a/0x3c0 [ 73.556755][ C1] __hrtimer_run_queues+0x364/0xe40 [ 73.561939][ C1] ? vkms_disable_vblank+0x20/0x20 [ 73.567075][ C1] ? hrtimer_init+0x330/0x330 [ 73.571734][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 73.577447][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 73.583517][ C1] hrtimer_interrupt+0x314/0x770 [ 73.588449][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 73.593982][ C1] apic_timer_interrupt+0xf/0x20 [ 73.598900][ C1] [ 73.601826][ C1] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 [ 73.608236][ C1] 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 [ 73.627832][ C1] RSP: 0018:ffff8880a0e47920 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 73.636228][ C1] RAX: 1ffffffff11e65ec RBX: 0000000000000286 RCX: 0000000000000000 [ 73.644181][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000286 [ 73.652134][ C1] RBP: ffff8880a0e47930 R08: ffff8880977a4000 R09: 0000000000000000 [ 73.660097][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a38502f0 [ 73.668058][ C1] R13: 0000000000000000 R14: ffff8880a38502f0 R15: ffff8880a3eedd08 [ 73.676044][ C1] drm_vblank_get+0x150/0x1e0 [ 73.680753][ C1] drm_wait_vblank_ioctl+0x51a/0x1990 [ 73.686106][ C1] ? drm_dev_exit+0x22/0x60 [ 73.690593][ C1] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 73.696686][ C1] ? lock_downgrade+0x920/0x920 [ 73.701519][ C1] ? lock_acquire+0x190/0x410 [ 73.706174][ C1] ? drm_dev_alloc+0xd0/0xd0 [ 73.710753][ C1] drm_ioctl_kernel+0x244/0x300 [ 73.715585][ C1] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 73.721629][ C1] ? drm_setversion+0x8c0/0x8c0 [ 73.726462][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 73.732687][ C1] ? _copy_from_user+0x12c/0x1a0 [ 73.737603][ C1] drm_ioctl+0x54e/0xa60 [ 73.741825][ C1] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 73.747875][ C1] ? drm_ioctl_kernel+0x300/0x300 [ 73.752879][ C1] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 73.758675][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.764900][ C1] ? drm_ioctl_kernel+0x300/0x300 [ 73.769920][ C1] do_vfs_ioctl+0xdb6/0x13e0 [ 73.774501][ C1] ? ioctl_preallocate+0x210/0x210 [ 73.779592][ C1] ? kmem_cache_free+0x26b/0x320 [ 73.784514][ C1] ? putname+0xf4/0x130 [ 73.788650][ C1] ? do_sys_open+0x31d/0x5d0 [ 73.793215][ C1] ? tomoyo_file_ioctl+0x23/0x30 [ 73.798131][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.804350][ C1] ? security_file_ioctl+0x8d/0xc0 [ 73.809458][ C1] ksys_ioctl+0xab/0xd0 [ 73.813593][ C1] __x64_sys_ioctl+0x73/0xb0 [ 73.818167][ C1] do_syscall_64+0xfa/0x760 [ 73.822657][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.828524][ C1] RIP: 0033:0x443e29 [ 73.832487][ C1] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 73.852068][ C1] RSP: 002b:00007fffd54b3668 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 73.860455][ C1] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e29 [ 73.868403][ C1] RDX: 0000000020000100 RSI: 00000000c018643a RDI: 0000000000000003 [ 73.876349][ C1] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 73.884299][ C1] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401b30 [ 73.892245][ C1] R13: 0000000000401bc0 R14: 0000000000000000 R15: 0000000000000000 [ 73.901728][ C1] Kernel Offset: disabled [ 73.906143][ C1] Rebooting in 86400 seconds..