[ OK ] Started Getty on tty2. Starting Load/Save RF Kill Switch Status... [ 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... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.528169][ T7037] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 59.553341][ T7037] ------------[ cut here ]------------ [ 59.558987][ T7037] WARNING: CPU: 0 PID: 7037 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 59.567093][ T7037] Kernel panic - not syncing: panic_on_warn set ... [ 59.573750][ T7037] CPU: 0 PID: 7037 Comm: syz-executor893 Not tainted 5.6.0-syzkaller #0 [ 59.582110][ T7037] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.592147][ T7037] Call Trace: [ 59.595437][ T7037] dump_stack+0x188/0x20d [ 59.599806][ T7037] ? inc_nlink+0x100/0x160 [ 59.604267][ T7037] panic+0x2e3/0x75c [ 59.608159][ T7037] ? add_taint.cold+0x16/0x16 [ 59.612822][ T7037] ? printk+0xba/0xed [ 59.616805][ T7037] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 59.622276][ T7037] ? __warn.cold+0x14/0x35 [ 59.626702][ T7037] ? __warn+0xd5/0x1c8 [ 59.630769][ T7037] ? inc_nlink+0x144/0x160 [ 59.635167][ T7037] __warn.cold+0x2f/0x35 [ 59.639407][ T7037] ? inc_nlink+0x144/0x160 [ 59.643807][ T7037] report_bug+0x27b/0x2f0 [ 59.648127][ T7037] do_error_trap+0x12b/0x220 [ 59.652742][ T7037] ? inc_nlink+0x144/0x160 [ 59.657140][ T7037] do_invalid_op+0x32/0x40 [ 59.661533][ T7037] ? inc_nlink+0x144/0x160 [ 59.665930][ T7037] invalid_op+0x23/0x30 [ 59.670100][ T7037] RIP: 0010:inc_nlink+0x144/0x160 [ 59.675104][ T7037] 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 9c be b0 ff <0f> 0b e9 6e ff ff ff e8 60 6f ee ff e9 44 ff ff ff e8 56 6f ee ff [ 59.694696][ T7037] RSP: 0018:ffffc900017a7d88 EFLAGS: 00010293 [ 59.700753][ T7037] RAX: ffff888093278600 RBX: ffff888087672a00 RCX: ffffffff81c265b0 [ 59.708707][ T7037] RDX: 0000000000000000 RSI: ffffffff81c26644 RDI: 0000000000000007 [ 59.716664][ T7037] RBP: 0000000000000000 R08: ffff888093278600 R09: ffffed1015440757 [ 59.724623][ T7037] R10: ffff8880aa203ab3 R11: ffffed1015440756 R12: ffff888087672a48 [ 59.732606][ T7037] R13: ffff88808b7cde60 R14: ffff88808b7cdec0 R15: 0000000000000000 [ 59.740573][ T7037] ? inc_nlink+0xb0/0x160 [ 59.744914][ T7037] ? inc_nlink+0x144/0x160 [ 59.749341][ T7037] ? inc_nlink+0x144/0x160 [ 59.753797][ T7037] minix_mkdir+0x71/0x1b0 [ 59.758127][ T7037] ? minix_create+0x30/0x30 [ 59.762615][ T7037] ? generic_permission+0x116/0x520 [ 59.767798][ T7037] ? security_inode_permission+0xc4/0xf0 [ 59.773430][ T7037] ? security_inode_mkdir+0xd9/0x110 [ 59.779167][ T7037] vfs_mkdir+0x419/0x690 [ 59.783393][ T7037] do_mkdirat+0x21e/0x280 [ 59.787706][ T7037] ? __ia32_sys_mknod+0xb0/0xb0 [ 59.792555][ T7037] ? filp_close+0x12f/0x170 [ 59.797084][ T7037] ? trace_hardirqs_off_caller+0x55/0x230 [ 59.802807][ T7037] do_syscall_64+0xf6/0x7d0 [ 59.807302][ T7037] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.813188][ T7037] RIP: 0033:0x444a69 [ 59.817066][ T7037] 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 [ 59.836660][ T7037] RSP: 002b:00007ffc70a88458 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 59.845054][ T7037] RAX: ffffffffffffffda RBX: 00007ffc70a88460 RCX: 0000000000444a69 [ 59.853012][ T7037] RDX: 0000000000000100 RSI: 0000000020000300 RDI: 0000000000000003 [ 59.860962][ T7037] RBP: 0000000000000000 R08: 0000000000400e50 R09: 0000000000400e50 [ 59.868911][ T7037] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004026d0 [ 59.876858][ T7037] R13: 0000000000402760 R14: 0000000000000000 R15: 0000000000000000 [ 59.886301][ T7037] Kernel Offset: disabled [ 59.890699][ T7037] Rebooting in 86400 seconds..