Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts.
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syzkaller login: [  555.946313][   T17] ------------[ cut here ]------------
[  555.954156][   T17] refcount_t: underflow; use-after-free.
[  555.978306][   T17] WARNING: CPU: 1 PID: 17 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0
[  556.012934][   T17] Kernel panic - not syncing: panic_on_warn set ...
[  556.019578][   T17] CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.8.0-syzkaller #0
[  556.027426][   T17] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  556.037784][   T17] Workqueue: events do_enable_set
[  556.042805][   T17] Call Trace:
[  556.046191][   T17]  dump_stack+0x1f0/0x31e
[  556.050685][   T17]  panic+0x264/0x7a0
[  556.054592][   T17]  ? __warn+0x102/0x250
[  556.058752][   T17]  ? refcount_warn_saturate+0x15b/0x1a0
[  556.064316][   T17]  ? refcount_warn_saturate+0x15b/0x1a0
[  556.069898][   T17]  __warn+0x227/0x250
[  556.073888][   T17]  ? refcount_warn_saturate+0x15b/0x1a0
[  556.079500][   T17]  report_bug+0x1b1/0x2e0
[  556.083900][   T17]  handle_bug+0x42/0x80
[  556.088247][   T17]  exc_invalid_op+0x16/0x40
[  556.092908][   T17]  asm_exc_invalid_op+0x12/0x20
[  556.097763][   T17] RIP: 0010:refcount_warn_saturate+0x15b/0x1a0
[  556.104188][   T17] Code: c7 8a af 14 89 31 c0 e8 b3 f2 a8 fd 0f 0b eb 85 e8 2a 32 d7 fd c6 05 a4 d9 eb 05 01 48 c7 c7 b6 af 14 89 31 c0 e8 95 f2 a8 fd <0f> 0b e9 64 ff ff ff e8 09 32 d7 fd c6 05 84 d9 eb 05 01 48 c7 c7
[  556.123789][   T17] RSP: 0018:ffffc90000d8fc48 EFLAGS: 00010246
[  556.129854][   T17] RAX: a0fd0e2c73fb4c00 RBX: 0000000000000003 RCX: ffff8880a9a48480
[  556.137823][   T17] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
[  556.145799][   T17] RBP: 0000000000000003 R08: ffffffff815dd389 R09: ffffed1015d262c0
[  556.154119][   T17] R10: ffffed1015d262c0 R11: 0000000000000000 R12: dffffc0000000000
[  556.162092][   T17] R13: ffff8880a99d9918 R14: dffffc0000000000 R15: ffff8880ae9350c0
[  556.170155][   T17]  ? vprintk_emit+0x339/0x3c0
[  556.174844][   T17]  ? refcount_warn_saturate+0x15b/0x1a0
[  556.180394][   T17]  do_enable_set+0x66e/0x900
[  556.184990][   T17]  ? lock_is_held_type+0x87/0xe0
[  556.190005][   T17]  process_one_work+0x789/0xfc0
[  556.194876][   T17]  worker_thread+0xaa4/0x1460
[  556.199644][   T17]  kthread+0x37e/0x3a0
[  556.203734][   T17]  ? rcu_lock_release+0x20/0x20
[  556.208581][   T17]  ? kthread_blkcg+0xd0/0xd0
[  556.213266][   T17]  ret_from_fork+0x1f/0x30
[  556.219228][   T17] Kernel Offset: disabled
[  556.223595][   T17] Rebooting in 86400 seconds..