[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.150132][ T27] audit: type=1800 audit(1560356830.888:25): pid=8782 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.197196][ T27] audit: type=1800 audit(1560356830.888:26): pid=8782 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.239974][ T27] audit: type=1800 audit(1560356830.898:27): pid=8782 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 '10.128.0.211' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 72.639910][ T8934] [drm:drm_calc_timestamping_constants] *ERROR* crtc 32: Can't calculate constants, dotclock = 0! [ 72.651431][ C0] WARNING: CPU: 0 PID: 8934 at drivers/gpu/drm/vkms/vkms_crtc.c:20 vkms_vblank_simulate+0x257/0x2c0 [ 72.662241][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 72.668816][ C0] CPU: 0 PID: 8934 Comm: syz-executor447 Not tainted 5.2.0-rc4-next-20190612 #13 [ 72.678021][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.688163][ C0] Call Trace: [ 72.691424][ C0] [ 72.694267][ C0] dump_stack+0x172/0x1f0 [ 72.698622][ C0] ? vkms_vblank_simulate+0x1f0/0x2c0 [ 72.703984][ C0] panic+0x2cb/0x744 [ 72.707865][ C0] ? __warn_printk+0xf3/0xf3 [ 72.712446][ C0] ? vkms_vblank_simulate+0x257/0x2c0 [ 72.717802][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.724036][ C0] ? __warn.cold+0x5/0x4d [ 72.728349][ C0] ? __warn+0xe8/0x1d0 [ 72.732406][ C0] ? vkms_vblank_simulate+0x257/0x2c0 [ 72.737764][ C0] __warn.cold+0x20/0x4d [ 72.742009][ C0] ? vkms_vblank_simulate+0x257/0x2c0 [ 72.747552][ C0] report_bug+0x263/0x2b0 [ 72.751889][ C0] do_error_trap+0x11b/0x200 [ 72.756508][ C0] do_invalid_op+0x37/0x50 [ 72.761055][ C0] ? vkms_vblank_simulate+0x257/0x2c0 [ 72.766590][ C0] invalid_op+0x14/0x20 [ 72.770829][ C0] RIP: 0010:vkms_vblank_simulate+0x257/0x2c0 [ 72.776917][ C0] Code: c7 c7 a0 aa e0 87 e8 c8 89 b7 ff e9 d2 fe ff ff e8 2e d5 8f fd 48 8b 45 d0 49 89 85 40 02 00 00 e9 7c ff ff ff e8 19 d5 8f fd <0f> 0b e9 8f fe ff ff e8 ad da c8 fd e9 d9 fe ff ff 48 89 55 d0 e8 [ 72.796658][ C0] RSP: 0018:ffff8880ae809dd8 EFLAGS: 00010006 [ 72.802718][ C0] RAX: ffff88808d6d2240 RBX: ffff8880a3cad950 RCX: ffffffff83e12bf3 [ 72.810717][ C0] RDX: 0000000000010000 RSI: ffffffff83e12d67 RDI: 0000000000000007 [ 72.818682][ C0] RBP: ffff8880ae809e08 R08: ffff88808d6d2240 R09: 0000000000000002 [ 72.826851][ C0] R10: fffffbfff1503fec R11: ffff88808d6d2240 R12: 000000000002d9d9 [ 72.835212][ C0] R13: ffff8880a3ccd6c0 R14: ffff8880a3cad9b0 R15: ffff8880a3cacea0 [ 72.843184][ C0] ? vkms_vblank_simulate+0xe3/0x2c0 [ 72.848461][ C0] ? vkms_vblank_simulate+0x257/0x2c0 [ 72.853911][ C0] ? vkms_vblank_simulate+0x257/0x2c0 [ 72.859271][ C0] __hrtimer_run_queues+0x33b/0xdd0 [ 72.864715][ C0] ? vkms_disable_vblank+0x20/0x20 [ 72.869820][ C0] ? hrtimer_start_range_ns+0xc70/0xc70 [ 72.875350][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 72.881116][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 72.887368][ C0] hrtimer_interrupt+0x314/0x770 [ 72.892490][ C0] smp_apic_timer_interrupt+0x111/0x550 [ 72.898035][ C0] apic_timer_interrupt+0xf/0x20 [ 72.903062][ C0] [ 72.906048][ C0] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 [ 72.912464][ C0] Code: 48 c7 c0 30 7b d2 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 b1 ae 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 2c 0f 2a fa 65 8b 05 4d 33 de 78 [ 72.932319][ C0] RSP: 0018:ffff88808c4c7928 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 72.940888][ C0] RAX: 1ffffffff11a4f66 RBX: 0000000000000282 RCX: 0000000000000000 [ 72.948844][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000282 [ 72.956805][ C0] RBP: ffff88808c4c7938 R08: ffff88808d6d2240 R09: 0000000000000000 [ 72.964807][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a3cac5b0 [ 72.972887][ C0] R13: 0000000000000000 R14: ffff8880a3cac5b0 R15: ffff8880a3cf2448 [ 72.981039][ C0] drm_vblank_get+0x150/0x1e0 [ 72.985710][ C0] drm_wait_vblank_ioctl+0x513/0x1950 [ 72.991109][ C0] ? find_held_lock+0x35/0x130 [ 72.995881][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 73.001936][ C0] ? lock_downgrade+0x920/0x920 [ 73.006771][ C0] ? lock_acquire+0x16f/0x3f0 [ 73.011433][ C0] ? drm_dev_exit+0x60/0x60 [ 73.016021][ C0] drm_ioctl_kernel+0x244/0x300 [ 73.020856][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 73.026916][ C0] ? drm_setversion+0x8c0/0x8c0 [ 73.031793][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 73.038027][ C0] ? _copy_from_user+0x12c/0x1a0 [ 73.042951][ C0] drm_ioctl+0x54e/0xa60 [ 73.047179][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 73.053241][ C0] ? drm_version+0x3d0/0x3d0 [ 73.058001][ C0] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 73.063847][ C0] ? drm_version+0x3d0/0x3d0 [ 73.068426][ C0] do_vfs_ioctl+0xdb6/0x13e0 [ 73.073002][ C0] ? ioctl_preallocate+0x210/0x210 [ 73.078098][ C0] ? putname+0xef/0x130 [ 73.082245][ C0] ? rcu_read_lock_sched_held+0x110/0x130 [ 73.087949][ C0] ? kmem_cache_free+0x26b/0x320 [ 73.092868][ C0] ? putname+0xf4/0x130 [ 73.097041][ C0] ? do_sys_open+0x31d/0x5d0 [ 73.101625][ C0] ? tomoyo_file_ioctl+0x23/0x30 [ 73.106669][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.113006][ C0] ? security_file_ioctl+0x8d/0xc0 [ 73.118151][ C0] ksys_ioctl+0xab/0xd0 [ 73.122304][ C0] __x64_sys_ioctl+0x73/0xb0 [ 73.126884][ C0] do_syscall_64+0xfd/0x680 [ 73.131382][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.137316][ C0] RIP: 0033:0x443e89 [ 73.141204][ C0] 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 [ 73.160971][ C0] RSP: 002b:00007fffd1938848 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 73.169365][ C0] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e89 [ 73.177318][ C0] RDX: 0000000020000040 RSI: 00000000c02c563a RDI: 0000000000000003 [ 73.185275][ C0] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 73.193229][ C0] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401b90 [ 73.201195][ C0] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 73.210222][ C0] Kernel Offset: disabled [ 73.214600][ C0] Rebooting in 86400 seconds..