[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.794232][ T26] audit: type=1800 audit(1559704978.269:25): pid=8367 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 52.836206][ T26] audit: type=1800 audit(1559704978.269:26): pid=8367 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 52.879251][ T26] audit: type=1800 audit(1559704978.269:27): pid=8367 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 '10.128.0.122' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.425217][ T8524] [drm:drm_calc_timestamping_constants] *ERROR* crtc 31: Can't calculate constants, dotclock = 0! [ 64.436736][ C1] WARNING: CPU: 1 PID: 8524 at drivers/gpu/drm/vkms/vkms_crtc.c:40 vkms_vblank_simulate+0x25c/0x2c0 [ 64.447531][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 64.454095][ C1] CPU: 1 PID: 8524 Comm: syz-executor006 Not tainted 5.2.0-rc3+ #38 [ 64.462044][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.472074][ C1] Call Trace: [ 64.475340][ C1] [ 64.478176][ C1] dump_stack+0x172/0x1f0 [ 64.482481][ C1] ? vkms_vblank_simulate+0x1d0/0x2c0 [ 64.487830][ C1] panic+0x2cb/0x744 [ 64.491701][ C1] ? __warn_printk+0xf3/0xf3 [ 64.496269][ C1] ? vkms_vblank_simulate+0x25c/0x2c0 [ 64.501617][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 64.507839][ C1] ? __warn.cold+0x5/0x4d [ 64.512896][ C1] ? __warn+0xe8/0x1d0 [ 64.516953][ C1] ? vkms_vblank_simulate+0x25c/0x2c0 [ 64.522324][ C1] __warn.cold+0x20/0x4d [ 64.526568][ C1] ? vkms_vblank_simulate+0x25c/0x2c0 [ 64.531943][ C1] report_bug+0x263/0x2b0 [ 64.536256][ C1] do_error_trap+0x11b/0x200 [ 64.540822][ C1] do_invalid_op+0x37/0x50 [ 64.545211][ C1] ? vkms_vblank_simulate+0x25c/0x2c0 [ 64.550560][ C1] invalid_op+0x14/0x20 [ 64.554779][ C1] RIP: 0010:vkms_vblank_simulate+0x25c/0x2c0 [ 64.560770][ C1] Code: c7 c7 40 2c c0 87 e8 33 08 ba ff e9 32 fe ff ff e8 39 0f 93 fd 48 8b 45 d0 49 89 86 40 02 00 00 e9 7a ff ff ff e8 24 0f 93 fd <0f> 0b e9 f4 fe ff ff e8 e8 ac cb fd e9 3a fe ff ff e8 3e ad cb fd [ 64.580440][ C1] RSP: 0018:ffff8880ae909dd8 EFLAGS: 00010006 [ 64.586501][ C1] RAX: ffff88808f09a200 RBX: ffff8880ae926d80 RCX: ffffffff83dd967d [ 64.594457][ C1] RDX: 0000000000010000 RSI: ffffffff83dd978c RDI: 0000000000000007 [ 64.602418][ C1] RBP: ffff8880ae909e08 R08: ffff88808f09a200 R09: 0000000000000002 [ 64.610373][ C1] R10: fffffbfff14c2b64 R11: ffff88808f09a200 R12: 0000000000061a57 [ 64.618328][ C1] R13: ffff8880a3d49910 R14: 0000000000000000 R15: ffff8880a3d48e08 [ 64.626295][ C1] ? vkms_vblank_simulate+0x14d/0x2c0 [ 64.631652][ C1] ? vkms_vblank_simulate+0x25c/0x2c0 [ 64.637007][ C1] ? vkms_vblank_simulate+0x25c/0x2c0 [ 64.642490][ C1] __hrtimer_run_queues+0x33b/0xdd0 [ 64.647709][ C1] ? vkms_disable_vblank+0x20/0x20 [ 64.652807][ C1] ? hrtimer_start_range_ns+0xc70/0xc70 [ 64.658353][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 64.664069][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 64.670129][ C1] hrtimer_interrupt+0x314/0x770 [ 64.675064][ C1] smp_apic_timer_interrupt+0x111/0x550 [ 64.680592][ C1] apic_timer_interrupt+0xf/0x20 [ 64.685501][ C1] [ 64.688432][ C1] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 [ 64.694832][ C1] Code: 48 c7 c0 f0 73 b2 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 d0 95 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 7c d8 30 fa 65 8b 05 dd 59 e5 78 [ 64.714617][ C1] RSP: 0018:ffff88808aa2f928 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 64.723017][ C1] RAX: 1ffffffff1164e7e RBX: 0000000000000286 RCX: 0000000000000000 [ 64.730966][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000286 [ 64.738921][ C1] RBP: ffff88808aa2f938 R08: ffff88808f09a200 R09: 0000000000000000 [ 64.746881][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a3d48530 [ 64.754834][ C1] R13: 0000000000000000 R14: ffff8880a3d48530 R15: ffff888219f63188 [ 64.762827][ C1] drm_vblank_get+0x150/0x1e0 [ 64.767486][ C1] drm_wait_vblank_ioctl+0x513/0x1950 [ 64.772838][ C1] ? drm_dev_exit+0x22/0x60 [ 64.777321][ C1] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 64.783485][ C1] ? lock_downgrade+0x880/0x880 [ 64.788422][ C1] ? drm_dev_exit+0x60/0x60 [ 64.792920][ C1] drm_ioctl_kernel+0x244/0x300 [ 64.797759][ C1] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 64.803810][ C1] ? drm_setversion+0x8c0/0x8c0 [ 64.808645][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 64.814864][ C1] ? _copy_from_user+0xdd/0x150 [ 64.819709][ C1] drm_ioctl+0x54e/0xa60 [ 64.823933][ C1] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 64.830226][ C1] ? drm_version+0x3d0/0x3d0 [ 64.834799][ C1] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 64.840602][ C1] ? drm_version+0x3d0/0x3d0 [ 64.845174][ C1] do_vfs_ioctl+0xd5f/0x1380 [ 64.849767][ C1] ? ioctl_preallocate+0x210/0x210 [ 64.854863][ C1] ? putname+0xef/0x130 [ 64.859003][ C1] ? putname+0xef/0x130 [ 64.863135][ C1] ? rcu_read_lock_sched_held+0x110/0x130 [ 64.868837][ C1] ? kmem_cache_free+0x222/0x260 [ 64.873756][ C1] ? putname+0xf4/0x130 [ 64.878003][ C1] ? do_sys_open+0x31d/0x5d0 [ 64.882577][ C1] ? tomoyo_file_ioctl+0x23/0x30 [ 64.887501][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 64.893726][ C1] ? security_file_ioctl+0x8d/0xc0 [ 64.898817][ C1] ksys_ioctl+0xab/0xd0 [ 64.902951][ C1] __x64_sys_ioctl+0x73/0xb0 [ 64.907536][ C1] do_syscall_64+0xfd/0x680 [ 64.912034][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 64.918031][ C1] RIP: 0033:0x443e89 [ 64.921915][ 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 [ 64.941501][ C1] RSP: 002b:00007ffff4e72888 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 64.949960][ C1] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e89 [ 64.958023][ C1] RDX: 0000000020000040 RSI: 00000000c02c563a RDI: 0000000000000003 [ 64.966090][ C1] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 64.974043][ C1] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401b90 [ 64.982019][ C1] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 64.991492][ C1] Kernel Offset: disabled [ 64.995883][ C1] Rebooting in 86400 seconds..