[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.979416][ T26] audit: type=1800 audit(1549878098.534:25): pid=7622 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 38.016439][ T26] audit: type=1800 audit(1549878098.534:26): pid=7622 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.042296][ T26] audit: type=1800 audit(1549878098.534:27): pid=7622 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 '10.128.0.229' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.853212][ T7773] [drm:drm_calc_timestamping_constants] *ERROR* crtc 31: Can't calculate constants, dotclock = 0! [ 48.864734][ C1] WARNING: CPU: 1 PID: 7773 at drivers/gpu/drm/vkms/vkms_crtc.c:40 vkms_vblank_simulate+0x262/0x2c0 [ 48.875602][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 48.882171][ C1] CPU: 1 PID: 7773 Comm: syz-executor184 Not tainted 5.0.0-rc5-next-20190211 #32 [ 48.891244][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.901287][ C1] Call Trace: [ 48.904550][ C1] [ 48.907385][ C1] dump_stack+0x172/0x1f0 [ 48.911698][ C1] ? vkms_vblank_simulate+0x260/0x2c0 [ 48.917052][ C1] panic+0x2cb/0x65c [ 48.920937][ C1] ? __warn_printk+0xf3/0xf3 [ 48.925503][ C1] ? vkms_vblank_simulate+0x262/0x2c0 [ 48.930848][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.937075][ C1] ? __warn.cold+0x5/0x45 [ 48.941505][ C1] ? __warn+0xe8/0x1d0 [ 48.945550][ C1] ? vkms_vblank_simulate+0x262/0x2c0 [ 48.950909][ C1] __warn.cold+0x20/0x45 [ 48.955138][ C1] ? vkms_vblank_simulate+0x262/0x2c0 [ 48.960484][ C1] report_bug+0x263/0x2b0 [ 48.964793][ C1] do_error_trap+0x11b/0x200 [ 48.969500][ C1] do_invalid_op+0x37/0x50 [ 48.973899][ C1] ? vkms_vblank_simulate+0x262/0x2c0 [ 48.979253][ C1] invalid_op+0x14/0x20 [ 48.983389][ C1] RIP: 0010:vkms_vblank_simulate+0x262/0x2c0 [ 48.989344][ C1] Code: c7 c7 a0 bc bd 87 e8 5d 3d bb ff e9 2c fe ff ff e8 13 0e 9b fd 48 8b 45 d0 49 89 86 40 02 00 00 e9 7a ff ff ff e8 fe 0d 9b fd <0f> 0b e9 f4 fe ff ff e8 b2 d2 d2 fd e9 34 fe ff ff e8 08 d3 d2 fd [ 49.008924][ C1] RSP: 0018:ffff8880ae907dd8 EFLAGS: 00010006 [ 49.015036][ C1] RAX: ffff888098fb2480 RBX: ffff8880ae925d80 RCX: ffffffff83d53af3 [ 49.023057][ C1] RDX: 0000000000010000 RSI: ffffffff83d53c02 RDI: 0000000000000007 [ 49.031008][ C1] RBP: ffff8880ae907e08 R08: ffff888098fb2480 R09: ffffffff899a5048 [ 49.038953][ C1] R10: ffffffff899a5050 R11: 0000000000000001 R12: 0000000000055ce8 [ 49.046904][ C1] R13: ffff8881d09a99c0 R14: 0000000000000000 R15: ffff8881d09a8e98 [ 49.054875][ C1] ? vkms_vblank_simulate+0x153/0x2c0 [ 49.060221][ C1] ? vkms_vblank_simulate+0x262/0x2c0 [ 49.065566][ C1] ? vkms_vblank_simulate+0x262/0x2c0 [ 49.070914][ C1] __hrtimer_run_queues+0x33e/0xde0 [ 49.076095][ C1] ? vkms_disable_vblank+0x20/0x20 [ 49.081186][ C1] ? hrtimer_start_range_ns+0xc80/0xc80 [ 49.086709][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.092402][ C1] ? ktime_get_update_offsets_now+0x2d9/0x440 [ 49.098447][ C1] hrtimer_interrupt+0x314/0x770 [ 49.103371][ C1] smp_apic_timer_interrupt+0x120/0x570 [ 49.109016][ C1] apic_timer_interrupt+0xf/0x20 [ 49.113924][ C1] [ 49.116845][ C1] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 [ 49.123246][ C1] Code: 48 c7 c0 f0 89 92 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d c2 86 8b 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 cc c2 46 fa 65 8b 05 45 ea fa 78 [ 49.142834][ C1] RSP: 0018:ffff88801de8f938 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 49.151233][ C1] RAX: 1ffffffff112513e RBX: 0000000000000286 RCX: 0000000000000000 [ 49.159184][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000286 [ 49.167129][ C1] RBP: ffff88801de8f948 R08: ffff888098fb2480 R09: 0000000000000000 [ 49.175175][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d09a8430 [ 49.183124][ C1] R13: 0000000000000000 R14: ffff8881d09a8430 R15: ffff888066cda608 [ 49.191101][ C1] drm_vblank_get+0x150/0x1e0 [ 49.195761][ C1] drm_wait_vblank_ioctl+0x4f8/0x17a0 [ 49.201111][ C1] ? drm_legacy_modeset_ctl_ioctl+0x490/0x490 [ 49.207267][ C1] ? lock_downgrade+0x880/0x880 [ 49.212101][ C1] ? drm_dev_exit+0x60/0x60 [ 49.216593][ C1] drm_ioctl_kernel+0x23e/0x2e0 [ 49.221420][ C1] ? drm_legacy_modeset_ctl_ioctl+0x490/0x490 [ 49.227462][ C1] ? drm_setversion+0x8c0/0x8c0 [ 49.232293][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.238507][ C1] ? _copy_from_user+0xdd/0x150 [ 49.243332][ C1] drm_ioctl+0x545/0xa50 [ 49.247549][ C1] ? drm_legacy_modeset_ctl_ioctl+0x490/0x490 [ 49.253594][ C1] ? drm_version+0x3d0/0x3d0 [ 49.258160][ C1] ? debug_check_no_obj_freed+0x211/0x444 [ 49.263861][ C1] ? kasan_check_write+0x14/0x20 [ 49.268775][ C1] ? lock_downgrade+0x880/0x880 [ 49.273606][ C1] ? trace_hardirqs_off+0x62/0x220 [ 49.278754][ C1] ? drm_version+0x3d0/0x3d0 [ 49.283339][ C1] do_vfs_ioctl+0xd6e/0x1390 [ 49.287953][ C1] ? ioctl_preallocate+0x210/0x210 [ 49.293052][ C1] ? putname+0xef/0x130 [ 49.297229][ C1] ? rcu_read_lock_sched_held+0x110/0x130 [ 49.302933][ C1] ? kmem_cache_free+0x225/0x260 [ 49.307844][ C1] ? putname+0xf4/0x130 [ 49.311990][ C1] ? do_sys_open+0x31d/0x5d0 [ 49.316559][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.322774][ C1] ? security_file_ioctl+0x93/0xc0 [ 49.327868][ C1] ksys_ioctl+0xab/0xd0 [ 49.332007][ C1] __x64_sys_ioctl+0x73/0xb0 [ 49.336658][ C1] do_syscall_64+0x103/0x610 [ 49.341240][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.347107][ C1] RIP: 0033:0x443ca9 [ 49.350982][ 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 [ 49.370564][ C1] RSP: 002b:00007fff8472a0d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 49.378952][ C1] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443ca9 [ 49.386898][ C1] RDX: 0000000020000000 RSI: 00000000c018643a RDI: 0000000000000003 [ 49.394844][ C1] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 49.402796][ C1] R10: 000000000000000f R11: 0000000000000246 R12: 00000000004019b0 [ 49.410739][ C1] R13: 0000000000401a40 R14: 0000000000000000 R15: 0000000000000000 [ 49.419811][ C1] Kernel Offset: disabled [ 49.424183][ C1] Rebooting in 86400 seconds..