[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ 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 Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.72' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.129987] ------------[ cut here ]------------ [ 28.134816] WARNING: CPU: 1 PID: 7960 at fs/inode.c:342 inc_nlink+0x113/0x130 [ 28.142071] Kernel panic - not syncing: panic_on_warn set ... [ 28.142071] [ 28.149420] CPU: 1 PID: 7960 Comm: syz-executor341 Not tainted 4.14.267-syzkaller #0 [ 28.157284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.166619] Call Trace: [ 28.169204] dump_stack+0x1b2/0x281 [ 28.172843] panic+0x1f9/0x42d [ 28.176020] ? add_taint.cold+0x16/0x16 [ 28.179979] ? inc_nlink+0x113/0x130 [ 28.183672] ? inc_nlink+0x113/0x130 [ 28.187366] __warn.cold+0x20/0x44 [ 28.190886] ? ist_end_non_atomic+0x10/0x10 [ 28.195197] ? inc_nlink+0x113/0x130 [ 28.198891] report_bug+0x208/0x250 [ 28.202501] do_error_trap+0x195/0x2d0 [ 28.206370] ? math_error+0x2d0/0x2d0 [ 28.210151] ? trace_hardirqs_on+0x10/0x10 [ 28.214362] ? do_raw_spin_unlock+0x164/0x220 [ 28.218838] ? _raw_spin_unlock+0x29/0x40 [ 28.222968] ? d_instantiate_no_diralias+0xdf/0x130 [ 28.227967] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.232792] invalid_op+0x1b/0x40 [ 28.236227] RIP: 0010:inc_nlink+0x113/0x130 [ 28.240704] RSP: 0018:ffff88809093fc80 EFLAGS: 00010297 [ 28.246048] RAX: ffff88809f5fc080 RBX: ffff888095d6f0c0 RCX: 0000000000004763 [ 28.253301] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888095d6f198 [ 28.260571] RBP: 0000000000000000 R08: ffffffff8b9c65d8 R09: 000000000004057b [ 28.267820] R10: ffff88809f5fc980 R11: ffff88809f5fc080 R12: ffff888095d6f108 [ 28.275070] R13: 0000000000000000 R14: ffff8880b455a900 R15: 0000000000000005 [ 28.282334] fuse_link+0x32c/0x4b0 [ 28.285856] ? create_new_entry.constprop.0+0x520/0x520 [ 28.291204] vfs_link+0x6d5/0xb40 [ 28.294659] SyS_linkat+0x3e5/0x6a0 [ 28.298272] ? SyS_symlink+0x30/0x30 [ 28.301967] ? do_futex+0x1570/0x1570 [ 28.305748] ? kernel_write+0x110/0x110 [ 28.309708] ? do_syscall_64+0x4c/0x640 [ 28.313661] ? SyS_linkat+0x6a0/0x6a0 [ 28.317460] do_syscall_64+0x1d5/0x640 [ 28.321332] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.326499] RIP: 0033:0x7f339b35bd29 [ 28.330190] RSP: 002b:00007f339b2ec2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 [ 28.337877] RAX: ffffffffffffffda RBX: 00007f339b3ee4d0 RCX: 00007f339b35bd29 [ 28.345211] RDX: 00007f339b35bd29 RSI: 0000000020000080 RDI: 0000000020000040 [ 28.352482] RBP: 00007f339b3bc0ec R08: 0000000000003065 R09: 0000000000000000 [ 28.359751] R10: 0000000000000030 R11: 0000000000000246 R12: 00007f339b3b60d8 [ 28.367001] R13: 00007f339b3b80e0 R14: 00007f339b3ba0e8 R15: 00007f339b3ee4d8 [ 28.374564] Kernel Offset: disabled [ 28.378229] Rebooting in 86400 seconds..