Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.108' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   32.765026] ------------[ cut here ]------------
[   32.770198] WARNING: CPU: 1 PID: 8105 at fs/inode.c:343 inc_nlink.cold+0x11/0x18
[   32.777821] Kernel panic - not syncing: panic_on_warn set ...
[   32.777821] 
[   32.785179] CPU: 1 PID: 8105 Comm: syz-executor182 Not tainted 4.19.211-syzkaller #0
[   32.793041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.802375] Call Trace:
[   32.804951]  dump_stack+0x1fc/0x2ef
[   32.808563]  panic+0x26a/0x50e
[   32.811735]  ? __warn_printk+0xf3/0xf3
[   32.815606]  ? inc_nlink.cold+0x11/0x18
[   32.819563]  ? __probe_kernel_read+0x130/0x1b0
[   32.824139]  ? __warn.cold+0x5/0x5a
[   32.827751]  ? __warn+0xe4/0x200
[   32.831114]  ? inc_nlink.cold+0x11/0x18
[   32.835075]  __warn.cold+0x20/0x5a
[   32.838594]  ? inc_nlink.cold+0x11/0x18
[   32.842556]  report_bug+0x262/0x2b0
[   32.846168]  do_error_trap+0x1d7/0x310
[   32.850033]  ? math_error+0x310/0x310
[   32.853814]  ? __irq_work_queue_local+0x101/0x160
[   32.858636]  ? irq_work_queue+0x29/0x80
[   32.862607]  ? error_entry+0x72/0xd0
[   32.866302]  ? trace_hardirqs_off_caller+0x6e/0x210
[   32.871308]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   32.876135]  invalid_op+0x14/0x20
[   32.879570] RIP: 0010:inc_nlink.cold+0x11/0x18
[   32.884144] Code: c0 74 04 3c 03 7e 08 8b 5d 48 e9 e7 68 b4 f9 4c 89 e7 e8 aa 99 a3 f9 eb ee e8 43 bd 6d f9 48 c7 c7 80 b0 74 88 e8 a2 ee fe ff <0f> 0b e9 29 6a b4 f9 e8 2b bd 6d f9 48 8d 7b 40 b8 ff ff 37 00 48
[   32.903046] RSP: 0018:ffff8880b2a2fce8 EFLAGS: 00010282
[   32.908407] RAX: 0000000000000024 RBX: ffff88808db9a6c0 RCX: 0000000000000000
[   32.915655] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1016545f8f
[   32.922905] RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000
[   32.930172] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808db9a708
[   32.937422] R13: ffff8880b550b080 R14: ffff88809b1f5100 R15: ffff8880b5207280
[   32.944679]  ? vprintk_func+0x81/0x180
[   32.948634]  ? inc_nlink.cold+0x11/0x18
[   32.952692]  v9fs_vfs_mkdir_dotl+0x4eb/0x610
[   32.957082]  ? v9fs_vfs_create_dotl+0x30/0x30
[   32.961568]  ? cap_task_prctl+0xb50/0xd30
[   32.965700]  ? capable_wrt_inode_uidgid+0x1d2/0x220
[   32.970697]  ? generic_permission+0x116/0x4d0
[   32.975177]  ? inode_permission.part.0+0x10c/0x450
[   32.980086]  vfs_mkdir+0x508/0x7a0
[   32.983606]  do_mkdirat+0x262/0x2d0
[   32.987219]  ? __ia32_sys_mknod+0x120/0x120
[   32.991526]  ? trace_hardirqs_off_caller+0x6e/0x210
[   32.996521]  ? do_syscall_64+0x21/0x620
[   33.000478]  do_syscall_64+0xf9/0x620
[   33.004263]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   33.009432] RIP: 0033:0x7f83d36dc829
[   33.013143] Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
[   33.032038] RSP: 002b:00007ffce5ffcad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
[   33.039725] RAX: ffffffffffffffda RBX: 00007ffce5ffcae8 RCX: 00007f83d36dc829
[   33.046973] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200002c0
[   33.054221] RBP: 00007ffce5ffcae0 R08: 00007f83d369aaf0 R09: 00007f83d369aaf0
[   33.061467] R10: 0000000020000340 R11: 0000000000000246 R12: 0000000000000000
[   33.068716] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   33.076359] Kernel Offset: disabled
[   33.080033] Rebooting in 86400 seconds..