Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   46.959169][ T7599] ------------[ cut here ]------------
[   46.965367][ T7599] percpu_ref_kill_and_confirm called more than once on io_ring_ctx_ref_free!
[   46.965597][ T7599] WARNING: CPU: 0 PID: 7599 at lib/percpu-refcount.c:335 percpu_ref_kill_and_confirm+0x341/0x3b0
[   46.986884][ T7599] Kernel panic - not syncing: panic_on_warn set ...
[   46.993825][ T7599] CPU: 0 PID: 7599 Comm: syz-executor699 Not tainted 5.1.0-rc5+ #79
[   47.002255][ T7599] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.012769][ T7599] Call Trace:
[   47.016065][ T7599]  dump_stack+0x172/0x1f0
[   47.020616][ T7599]  ? percpu_ref_kill_and_confirm+0x340/0x3b0
[   47.026596][ T7599]  panic+0x2cb/0x65c
[   47.030486][ T7599]  ? __warn_printk+0xf3/0xf3
[   47.035956][ T7599]  ? percpu_ref_kill_and_confirm+0x341/0x3b0
[   47.042379][ T7599]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   47.048755][ T7599]  ? __warn.cold+0x5/0x45
[   47.053093][ T7599]  ? __warn+0xe8/0x1d0
[   47.057395][ T7599]  ? percpu_ref_kill_and_confirm+0x341/0x3b0
[   47.063985][ T7599]  __warn.cold+0x20/0x45
[   47.068229][ T7599]  ? vprintk_emit+0x1ce/0x6d0
[   47.073131][ T7599]  ? percpu_ref_kill_and_confirm+0x341/0x3b0
[   47.079194][ T7599]  report_bug+0x263/0x2b0
[   47.083522][ T7599]  do_error_trap+0x11b/0x200
[   47.088495][ T7599]  do_invalid_op+0x37/0x50
[   47.093194][ T7599]  ? percpu_ref_kill_and_confirm+0x341/0x3b0
[   47.099172][ T7599]  invalid_op+0x14/0x20
[   47.103686][ T7599] RIP: 0010:percpu_ref_kill_and_confirm+0x341/0x3b0
[   47.110265][ T7599] Code: 42 e0 2a 06 01 48 89 fa 48 c1 ea 03 80 3c 02 00 75 76 49 8b 54 24 10 48 c7 c6 a0 71 a1 87 48 c7 c7 40 71 a1 87 e8 ad 92 13 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
[   47.130886][ T7599] RSP: 0018:ffff888086d67cf0 EFLAGS: 00010082
[   47.137211][ T7599] RAX: 0000000000000000 RBX: 0000607f5142d66b RCX: 0000000000000000
[   47.145633][ T7599] RDX: 0000000000000000 RSI: ffffffff815afcf6 RDI: ffffed1010dacf90
[   47.153695][ T7599] RBP: ffff888086d67d20 R08: ffff88808fdb85c0 R09: fffffbfff1133639
[   47.162153][ T7599] R10: fffffbfff1133638 R11: ffffffff8899b1c3 R12: ffff88808cc7ed00
[   47.170118][ T7599] R13: ffff88808cc7ed08 R14: 0000000000000286 R15: 0000000000000000
[   47.178285][ T7599]  ? vprintk_func+0x86/0x189
[   47.183213][ T7599]  __io_uring_register+0xa7/0x1fe0
[   47.188750][ T7599]  ? __mutex_lock+0x3cd/0x1310
[   47.193855][ T7599]  ? __x64_sys_io_uring_register+0x182/0x1f0
[   47.199835][ T7599]  ? mutex_trylock+0x1e0/0x1e0
[   47.204735][ T7599]  ? io_sq_wq_submit_work+0x10f0/0x10f0
[   47.210620][ T7599]  ? kasan_check_write+0x14/0x20
[   47.215558][ T7599]  __x64_sys_io_uring_register+0x193/0x1f0
[   47.221688][ T7599]  do_syscall_64+0x103/0x610
[   47.226377][ T7599]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   47.232401][ T7599] RIP: 0033:0x4458c9
[   47.236653][ T7599] Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   47.257154][ T7599] RSP: 002b:00007fbff694cdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
[   47.265725][ T7599] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 00000000004458c9
[   47.273694][ T7599] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003
[   47.282339][ T7599] RBP: 00000000006dac30 R08: 00007fbff694d700 R09: 0000000000000000
[   47.290400][ T7599] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c
[   47.298522][ T7599] R13: 00007fffe33921ff R14: 00007fbff694d9c0 R15: 20c49ba5e353f7cf
[   47.308744][ T7599] Kernel Offset: disabled
[   47.314071][ T7599] Rebooting in 86400 seconds..