Warning: Permanently added '10.128.0.198' (ECDSA) to the list of known hosts.
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syzkaller login: [   44.948480][ T6796] IPVS: ftp: loaded support on port[0] = 21
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[   45.146777][   T21] ------------[ cut here ]------------
[   45.152344][   T21] refcount_t: addition on 0; use-after-free.
[   45.158611][   T21] WARNING: CPU: 1 PID: 21 at lib/refcount.c:25 refcount_warn_saturate+0x13d/0x1a0
[   45.167788][   T21] Kernel panic - not syncing: panic_on_warn set ...
[   45.174345][   T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.9.0-rc3-syzkaller #0
[   45.182662][   T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   45.192692][   T21] Workqueue: qrtr_ns_handler qrtr_ns_worker
[   45.198552][   T21] Call Trace:
[   45.201833][   T21]  dump_stack+0x1d6/0x29e
[   45.206150][   T21]  panic+0x2c0/0x800
[   45.210020][   T21]  ? __warn+0x102/0x250
[   45.214147][   T21]  ? refcount_warn_saturate+0x13d/0x1a0
[   45.219764][   T21]  ? refcount_warn_saturate+0x13d/0x1a0
[   45.225382][   T21]  __warn+0x227/0x250
[   45.229345][   T21]  ? refcount_warn_saturate+0x13d/0x1a0
[   45.234878][   T21]  report_bug+0x1b1/0x2e0
[   45.239285][   T21]  handle_bug+0x42/0x80
[   45.243420][   T21]  exc_invalid_op+0x16/0x40
[   45.247893][   T21]  asm_exc_invalid_op+0x12/0x20
[   45.252713][   T21] RIP: 0010:refcount_warn_saturate+0x13d/0x1a0
[   45.258836][   T21] Code: c7 83 96 15 89 31 c0 e8 b1 34 a6 fd 0f 0b eb a3 e8 a8 94 d4 fd c6 05 04 8e ea 05 01 48 c7 c7 ba 96 15 89 31 c0 e8 93 34 a6 fd <0f> 0b eb 85 e8 8a 94 d4 fd c6 05 e7 8d ea 05 01 48 c7 c7 e6 96 15
[   45.278410][   T21] RSP: 0018:ffffc90000dd79c0 EFLAGS: 00010046
[   45.284444][   T21] RAX: eb7b51afe96d3100 RBX: 0000000000000002 RCX: ffff8880a9bf6580
[   45.292388][   T21] RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
[   45.300347][   T21] RBP: 0000000000000002 R08: ffffffff815e27d0 R09: ffffed1015d241c3
[   45.308295][   T21] R10: ffffed1015d241c3 R11: 0000000000000000 R12: ffff8880a761a898
[   45.316252][   T21] R13: 1ffff1101517fa56 R14: 0000000000000286 R15: ffff8880a761a800
[   45.324297][   T21]  ? vprintk_emit+0x2f0/0x370
[   45.329645][   T21]  qrtr_node_lookup+0xc0/0xd0
[   45.334310][   T21]  qrtr_recvmsg+0x429/0xa80
[   45.338805][   T21]  qrtr_ns_worker+0x176/0x45f0
[   45.343555][   T21]  ? __lock_acquire+0x110b/0x2ae0
[   45.348666][   T21]  ? rcu_read_lock_sched_held+0x2f/0xa0
[   45.354186][   T21]  ? lock_acquire+0x140/0x6f0
[   45.358850][   T21]  ? process_one_work+0x733/0xfc0
[   45.363846][   T21]  ? lock_is_held_type+0xb3/0xe0
[   45.368763][   T21]  process_one_work+0x789/0xfc0
[   45.373595][   T21]  worker_thread+0xaa4/0x1460
[   45.378271][   T21]  kthread+0x37e/0x3a0
[   45.382332][   T21]  ? rcu_lock_release+0x20/0x20
[   45.387168][   T21]  ? kthread_blkcg+0xd0/0xd0
[   45.391734][   T21]  ret_from_fork+0x1f/0x30
[   46.521439][   T21] Shutting down cpus with NMI
[   46.527449][   T21] Kernel Offset: disabled
[   46.531811][   T21] Rebooting in 86400 seconds..