Starting getty on tty2-tty6 if dbus and logind are not available... [ OK ] Started Daily Cleanup of Temporary Directories. Starting System Logging Service... [ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. [ OK ] Started Permit User Sessions. [ OK ] Found device /dev/ttyS0. [ OK ] Started System Logging Service. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 65.790596][ T28] audit: type=1400 audit(1590352129.960:8): avc: denied { execmem } for pid=7036 comm="syz-executor410" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 65.800934][ T7036] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 65.823672][ T7036] ------------[ cut here ]------------ [ 65.829268][ T7036] WARNING: CPU: 0 PID: 7036 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 65.837325][ T7036] Kernel panic - not syncing: panic_on_warn set ... [ 65.843911][ T7036] CPU: 0 PID: 7036 Comm: syz-executor410 Not tainted 5.7.0-rc6-syzkaller #0 [ 65.852572][ T7036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.862619][ T7036] Call Trace: [ 65.865909][ T7036] dump_stack+0x188/0x20d [ 65.870238][ T7036] ? inc_nlink+0xe0/0x160 [ 65.874566][ T7036] panic+0x2e3/0x75c [ 65.878458][ T7036] ? add_taint.cold+0x16/0x16 [ 65.883134][ T7036] ? printk+0xba/0xed [ 65.887118][ T7036] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 65.892574][ T7036] ? __warn.cold+0x14/0x35 [ 65.896990][ T7036] ? __warn+0xd5/0x1c8 [ 65.901063][ T7036] ? inc_nlink+0x144/0x160 [ 65.905468][ T7036] __warn.cold+0x2f/0x35 [ 65.909693][ T7036] ? inc_nlink+0x144/0x160 [ 65.914106][ T7036] report_bug+0x27b/0x2f0 [ 65.918434][ T7036] do_error_trap+0x12b/0x220 [ 65.923019][ T7036] ? inc_nlink+0x144/0x160 [ 65.927435][ T7036] do_invalid_op+0x32/0x40 [ 65.931845][ T7036] ? inc_nlink+0x144/0x160 [ 65.936304][ T7036] invalid_op+0x23/0x30 [ 65.940435][ T7036] RIP: 0010:inc_nlink+0x144/0x160 [ 65.945441][ T7036] Code: ff 4c 89 e7 e8 ed 70 ee ff e9 42 ff ff ff 4c 89 e7 e8 70 70 ee ff e9 fc fe ff ff 4c 89 e7 e8 63 70 ee ff eb d4 e8 bc 8f b0 ff <0f> 0b e9 6e ff ff ff e8 60 70 ee ff e9 44 ff ff ff e8 56 70 ee ff [ 65.965190][ T7036] RSP: 0018:ffffc90001577d88 EFLAGS: 00010293 [ 65.971232][ T7036] RAX: ffff8880a149c280 RBX: ffff888084da8a00 RCX: ffffffff81c2a4d0 [ 65.979180][ T7036] RDX: 0000000000000000 RSI: ffffffff81c2a564 RDI: 0000000000000007 [ 65.987140][ T7036] RBP: 0000000000000000 R08: ffff8880a149c280 R09: fffffbfff1513311 [ 65.995098][ T7036] R10: ffffffff8a899887 R11: fffffbfff1513310 R12: ffff888084da8a48 [ 66.003053][ T7036] R13: ffff88808746cb80 R14: ffff88808746cbe0 R15: 0000000000000000 [ 66.011013][ T7036] ? inc_nlink+0xb0/0x160 [ 66.015316][ T7036] ? inc_nlink+0x144/0x160 [ 66.019720][ T7036] ? inc_nlink+0x144/0x160 [ 66.024110][ T7036] minix_mkdir+0x71/0x1b0 [ 66.028412][ T7036] ? minix_create+0x30/0x30 [ 66.032960][ T7036] ? security_inode_mkdir+0xd9/0x110 [ 66.038243][ T7036] vfs_mkdir+0x419/0x690 [ 66.042475][ T7036] do_mkdirat+0x21e/0x280 [ 66.046781][ T7036] ? __ia32_sys_mknod+0xb0/0xb0 [ 66.051619][ T7036] ? filp_close+0x12f/0x170 [ 66.056095][ T7036] ? trace_hardirqs_off_caller+0x55/0x230 [ 66.061794][ T7036] do_syscall_64+0xf6/0x7d0 [ 66.066275][ T7036] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 66.073109][ T7036] RIP: 0033:0x444a59 [ 66.076979][ T7036] Code: 0d d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 66.096569][ T7036] RSP: 002b:00007fff62bd84e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 66.104952][ T7036] RAX: ffffffffffffffda RBX: 00007fff62bd84f0 RCX: 0000000000444a59 [ 66.112896][ T7036] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000240 [ 66.120839][ T7036] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400e40 [ 66.128784][ T7036] R10: 00007fff62bd83c0 R11: 0000000000000246 R12: 00000000004026c0 [ 66.136727][ T7036] R13: 0000000000402750 R14: 0000000000000000 R15: 0000000000000000 [ 66.145886][ T7036] Kernel Offset: disabled [ 66.150264][ T7036] Rebooting in 86400 seconds..