Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.82' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   32.478090] ------------[ cut here ]------------
[   32.483175] WARNING: CPU: 0 PID: 8089 at fs/inode.c:343 inc_nlink.cold+0x11/0x18
[   32.490710] Kernel panic - not syncing: panic_on_warn set ...
[   32.490710] 
[   32.498058] CPU: 0 PID: 8089 Comm: syz-executor278 Not tainted 4.19.211-syzkaller #0
[   32.505922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.515255] Call Trace:
[   32.517838]  dump_stack+0x1fc/0x2ef
[   32.521452]  panic+0x26a/0x50e
[   32.524629]  ? __warn_printk+0xf3/0xf3
[   32.528507]  ? inc_nlink.cold+0x11/0x18
[   32.532469]  ? __probe_kernel_read+0x130/0x1b0
[   32.537031]  ? __warn.cold+0x5/0x5a
[   32.540639]  ? __warn+0xe4/0x200
[   32.543987]  ? inc_nlink.cold+0x11/0x18
[   32.547942]  __warn.cold+0x20/0x5a
[   32.551463]  ? inc_nlink.cold+0x11/0x18
[   32.555442]  report_bug+0x262/0x2b0
[   32.559052]  do_error_trap+0x1d7/0x310
[   32.562922]  ? math_error+0x310/0x310
[   32.566709]  ? __irq_work_queue_local+0x101/0x160
[   32.571542]  ? irq_work_queue+0x29/0x80
[   32.575503]  ? error_entry+0x72/0xd0
[   32.579329]  ? trace_hardirqs_off_caller+0x6e/0x210
[   32.584336]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   32.589167]  invalid_op+0x14/0x20
[   32.592608] RIP: 0010:inc_nlink.cold+0x11/0x18
[   32.597173] 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
[   32.616059] RSP: 0018:ffff88809d217ce8 EFLAGS: 00010282
[   32.621495] RAX: 0000000000000024 RBX: ffff88808db566c0 RCX: 0000000000000000
[   32.628928] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1013a42f8f
[   32.636179] RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000
[   32.643431] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808db56708
[   32.650855] R13: ffff88808e5b74a0 R14: ffff8880b3756c00 R15: ffff8880b0d74a40
[   32.658121]  ? vprintk_func+0x81/0x180
[   32.661996]  ? inc_nlink.cold+0x11/0x18
[   32.665951]  v9fs_vfs_mkdir_dotl+0x4eb/0x610
[   32.670340]  ? v9fs_vfs_create_dotl+0x30/0x30
[   32.674819]  ? cap_task_prctl+0x750/0xd30
[   32.678951]  ? capable_wrt_inode_uidgid+0x1d2/0x220
[   32.683958]  ? generic_permission+0x116/0x4d0
[   32.688435]  ? inode_permission.part.0+0x10c/0x450
[   32.693347]  vfs_mkdir+0x508/0x7a0
[   32.696870]  do_mkdirat+0x262/0x2d0
[   32.700479]  ? __ia32_sys_mknod+0x120/0x120
[   32.704797]  ? trace_hardirqs_off_caller+0x6e/0x210
[   32.709794]  ? do_syscall_64+0x21/0x620
[   32.713792]  do_syscall_64+0xf9/0x620
[   32.717594]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   32.722768] RIP: 0033:0x7fef17341829
[   32.726461] 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
[   32.745347] RSP: 002b:00007ffd3f371918 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
[   32.753041] RAX: ffffffffffffffda RBX: 00007ffd3f371928 RCX: 00007fef17341829
[   32.760291] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200002c0
[   32.767542] RBP: 00007ffd3f371920 R08: 00007fef172ffaf0 R09: 00007fef172ffaf0
[   32.774803] R10: 0000000020000340 R11: 0000000000000246 R12: 0000000000000000
[   32.782059] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   32.789608] Kernel Offset: disabled
[   32.793448] Rebooting in 86400 seconds..