[ OK ] Started Regular background program processing daemon. Starting OpenBSD Secure Shell server... Starting Permit User Sessions... [ OK ] Started Daily Cleanup of Temporary Directories. [ OK ] Reached target Timers. [ OK ] Started System Logging Service. [ OK ] Found device /dev/ttyS0. [ OK ] Started Permit User Sessions. [ 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 Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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 '10.128.0.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 70.275375][ T7044] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 70.287325][ T7044] ------------[ cut here ]------------ [ 70.293050][ T7044] WARNING: CPU: 1 PID: 7044 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 70.301035][ T7044] Kernel panic - not syncing: panic_on_warn set ... [ 70.307634][ T7044] CPU: 1 PID: 7044 Comm: syz-executor359 Not tainted 5.7.0-rc1-syzkaller #0 [ 70.316320][ T7044] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.326396][ T7044] Call Trace: [ 70.329706][ T7044] dump_stack+0x188/0x20d [ 70.334058][ T7044] ? inc_nlink+0xc0/0x160 [ 70.338413][ T7044] panic+0x2e3/0x75c [ 70.342326][ T7044] ? add_taint.cold+0x16/0x16 [ 70.347014][ T7044] ? printk+0xba/0xed [ 70.350975][ T7044] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 70.356415][ T7044] ? __warn.cold+0x14/0x35 [ 70.360813][ T7044] ? __warn+0xd5/0x1c8 [ 70.365218][ T7044] ? inc_nlink+0x144/0x160 [ 70.369627][ T7044] __warn.cold+0x2f/0x35 [ 70.373850][ T7044] ? inc_nlink+0x144/0x160 [ 70.378291][ T7044] report_bug+0x27b/0x2f0 [ 70.382618][ T7044] do_error_trap+0x12b/0x220 [ 70.387202][ T7044] ? inc_nlink+0x144/0x160 [ 70.391600][ T7044] do_invalid_op+0x32/0x40 [ 70.396015][ T7044] ? inc_nlink+0x144/0x160 [ 70.400415][ T7044] invalid_op+0x23/0x30 [ 70.404561][ T7044] RIP: 0010:inc_nlink+0x144/0x160 [ 70.409654][ T7044] Code: ff 4c 89 e7 e8 ed 6f ee ff e9 42 ff ff ff 4c 89 e7 e8 70 6f ee ff e9 fc fe ff ff 4c 89 e7 e8 63 6f ee ff eb d4 e8 7c a8 b0 ff <0f> 0b e9 6e ff ff ff e8 60 6f ee ff e9 44 ff ff ff e8 56 6f ee ff [ 70.429239][ T7044] RSP: 0018:ffffc90000f87d88 EFLAGS: 00010293 [ 70.435404][ T7044] RAX: ffff88809bd141c0 RBX: ffff888084a46a00 RCX: ffffffff81c28af0 [ 70.443451][ T7044] RDX: 0000000000000000 RSI: ffffffff81c28b84 RDI: 0000000000000007 [ 70.451565][ T7044] RBP: 0000000000000000 R08: ffff88809bd141c0 R09: fffffbfff15128a9 [ 70.459523][ T7044] R10: ffffffff8a894547 R11: fffffbfff15128a8 R12: ffff888084a46a48 [ 70.467492][ T7044] R13: ffff888087a42730 R14: ffff888087a42790 R15: 0000000000000000 [ 70.475462][ T7044] ? inc_nlink+0xb0/0x160 [ 70.479768][ T7044] ? inc_nlink+0x144/0x160 [ 70.484168][ T7044] ? inc_nlink+0x144/0x160 [ 70.488564][ T7044] minix_mkdir+0x71/0x1b0 [ 70.492897][ T7044] ? minix_create+0x30/0x30 [ 70.497401][ T7044] ? security_inode_mkdir+0xd9/0x110 [ 70.502667][ T7044] vfs_mkdir+0x419/0x690 [ 70.506891][ T7044] do_mkdirat+0x21e/0x280 [ 70.511201][ T7044] ? __ia32_sys_mknod+0xb0/0xb0 [ 70.516067][ T7044] ? filp_close+0x12f/0x170 [ 70.520553][ T7044] ? trace_hardirqs_off_caller+0x55/0x230 [ 70.526259][ T7044] do_syscall_64+0xf6/0x7d0 [ 70.530763][ T7044] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 70.536762][ T7044] RIP: 0033:0x444a69 [ 70.540682][ T7044] 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 [ 70.560289][ T7044] RSP: 002b:00007ffd2e9ae9a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 70.568921][ T7044] RAX: ffffffffffffffda RBX: 00007ffd2e9ae9b0 RCX: 0000000000444a69 [ 70.576889][ T7044] RDX: 0000000000000100 RSI: 0000000020000300 RDI: 0000000000000003 [ 70.584857][ T7044] RBP: 0000000000000000 R08: 0000000000400e50 R09: 0000000000400e50 [ 70.593083][ T7044] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004026d0 [ 70.601046][ T7044] R13: 0000000000402760 R14: 0000000000000000 R15: 0000000000000000 [ 70.610471][ T7044] Kernel Offset: disabled [ 70.614878][ T7044] Rebooting in 86400 seconds..