[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 77.177582][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 77.177597][ T26] audit: type=1400 audit(1559571137.232:35): avc: denied { map } for pid=9489 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.1.62' (ECDSA) to the list of known hosts. executing program [ 93.593864][ T26] audit: type=1400 audit(1559571153.652:36): avc: denied { map } for pid=9501 comm="syz-executor428" path="/root/syz-executor428498387" dev="sda1" ino=15969 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 93.599252][ T9501] [drm:drm_calc_timestamping_constants] *ERROR* crtc 31: Can't calculate constants, dotclock = 0! [ 93.633472][ C0] WARNING: CPU: 0 PID: 9501 at drivers/gpu/drm/vkms/vkms_crtc.c:40 vkms_vblank_simulate+0x25c/0x2c0 [ 93.644715][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 93.652267][ C0] CPU: 0 PID: 9501 Comm: syz-executor428 Not tainted 5.2.0-rc3 #11 [ 93.660458][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.671370][ C0] Call Trace: [ 93.675127][ C0] [ 93.678086][ C0] dump_stack+0x172/0x1f0 [ 93.682534][ C0] ? vkms_vblank_simulate+0x1d0/0x2c0 [ 93.688290][ C0] panic+0x2cb/0x744 [ 93.692199][ C0] ? __warn_printk+0xf3/0xf3 [ 93.697150][ C0] ? vkms_vblank_simulate+0x25c/0x2c0 [ 93.702780][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 93.709441][ C0] ? __warn.cold+0x5/0x4d [ 93.713860][ C0] ? __warn+0xe8/0x1d0 [ 93.718232][ C0] ? vkms_vblank_simulate+0x25c/0x2c0 [ 93.723715][ C0] __warn.cold+0x20/0x4d [ 93.727962][ C0] ? vkms_vblank_simulate+0x25c/0x2c0 [ 93.733522][ C0] report_bug+0x263/0x2b0 [ 93.738342][ C0] do_error_trap+0x11b/0x200 [ 93.742953][ C0] do_invalid_op+0x37/0x50 [ 93.747477][ C0] ? vkms_vblank_simulate+0x25c/0x2c0 [ 93.753466][ C0] invalid_op+0x14/0x20 [ 93.757894][ C0] RIP: 0010:vkms_vblank_simulate+0x25c/0x2c0 [ 93.764162][ C0] 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 [ 93.785098][ C0] RSP: 0018:ffff8880ae809dd8 EFLAGS: 00010006 [ 93.791179][ C0] RAX: ffff88809fa063c0 RBX: ffff8880ae826d80 RCX: ffffffff83dd967d [ 93.799439][ C0] RDX: 0000000000010000 RSI: ffffffff83dd978c RDI: 0000000000000007 [ 93.807654][ C0] RBP: ffff8880ae809e08 R08: ffff88809fa063c0 R09: 0000000000000002 [ 93.816462][ C0] R10: fffffbfff14c2b64 R11: ffff88809fa063c0 R12: 0000000000078a93 [ 93.824759][ C0] R13: ffff888219259850 R14: 0000000000000000 R15: ffff888219258d48 [ 93.833090][ C0] ? vkms_vblank_simulate+0x14d/0x2c0 [ 93.838626][ C0] ? vkms_vblank_simulate+0x25c/0x2c0 [ 93.844243][ C0] ? vkms_vblank_simulate+0x25c/0x2c0 [ 93.849632][ C0] __hrtimer_run_queues+0x33b/0xdd0 [ 93.854950][ C0] ? vkms_disable_vblank+0x20/0x20 [ 93.860164][ C0] ? hrtimer_start_range_ns+0xc70/0xc70 [ 93.865811][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 93.871757][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 93.878142][ C0] hrtimer_interrupt+0x314/0x770 [ 93.883141][ C0] smp_apic_timer_interrupt+0x111/0x550 [ 93.888951][ C0] apic_timer_interrupt+0xf/0x20 [ 93.893887][ C0] [ 93.896838][ C0] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 [ 93.903368][ C0] 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 [ 93.923602][ C0] RSP: 0018:ffff888096097928 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 93.932238][ C0] RAX: 1ffffffff1164e7e RBX: 0000000000000286 RCX: 0000000000000000 [ 93.940417][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: 0000000000000286 [ 93.948482][ C0] RBP: ffff888096097938 R08: ffff88809fa063c0 R09: 0000000000000000 [ 93.956632][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888219258470 [ 93.964722][ C0] R13: 0000000000000000 R14: ffff888219258470 R15: ffff8880a3d8be48 [ 93.972877][ C0] drm_vblank_get+0x150/0x1e0 [ 93.977582][ C0] drm_wait_vblank_ioctl+0x513/0x1950 [ 93.983071][ C0] ? drm_dev_exit+0x22/0x60 [ 93.987768][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 93.994130][ C0] ? lock_downgrade+0x880/0x880 [ 93.999272][ C0] ? drm_dev_exit+0x60/0x60 [ 94.003799][ C0] drm_ioctl_kernel+0x244/0x300 [ 94.009313][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 94.015425][ C0] ? drm_setversion+0x8c0/0x8c0 [ 94.020454][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 94.026707][ C0] ? _copy_from_user+0xdd/0x150 [ 94.031656][ C0] drm_ioctl+0x54e/0xa60 [ 94.035926][ C0] ? drm_legacy_modeset_ctl_ioctl+0x4a0/0x4a0 [ 94.042210][ C0] ? drm_version+0x3d0/0x3d0 [ 94.046823][ C0] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 94.052634][ C0] ? ___might_sleep+0x163/0x280 [ 94.057495][ C0] ? drm_version+0x3d0/0x3d0 [ 94.062106][ C0] do_vfs_ioctl+0xd5f/0x1380 [ 94.066699][ C0] ? ioctl_preallocate+0x210/0x210 [ 94.072005][ C0] ? selinux_file_mprotect+0x620/0x620 [ 94.077473][ C0] ? kmem_cache_free+0x222/0x260 [ 94.082474][ C0] ? putname+0xf4/0x130 [ 94.086696][ C0] ? do_sys_open+0x31d/0x5d0 [ 94.091485][ C0] ? tomoyo_file_ioctl+0x23/0x30 [ 94.096724][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 94.102970][ C0] ? security_file_ioctl+0x8d/0xc0 [ 94.108479][ C0] ksys_ioctl+0xab/0xd0 [ 94.112680][ C0] __x64_sys_ioctl+0x73/0xb0 [ 94.117446][ C0] do_syscall_64+0xfd/0x680 [ 94.121970][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 94.128280][ C0] RIP: 0033:0x443e89 [ 94.132484][ 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 [ 94.152608][ C0] RSP: 002b:00007ffdead049a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 94.161026][ C0] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e89 [ 94.169198][ C0] RDX: 0000000020000040 RSI: 00000000c02c563a RDI: 0000000000000003 [ 94.177524][ C0] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 94.186037][ C0] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401b90 [ 94.195813][ C0] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 94.206060][ C0] Kernel Offset: disabled [ 94.210487][ C0] Rebooting in 86400 seconds..