Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   72.785195][ T9392] IPVS: ftp: loaded support on port[0] = 21
[   72.816515][ T9392] netlink: 16 bytes leftover after parsing attributes in process `syz-executor395'.
[   72.858712][ T9392] ------------[ cut here ]------------
[   72.864265][ T9392] refcount_t: underflow; use-after-free.
[   72.870247][ T9392] WARNING: CPU: 1 PID: 9392 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0
[   72.879640][ T9392] Kernel panic - not syncing: panic_on_warn set ...
[   72.886206][ T9392] CPU: 1 PID: 9392 Comm: syz-executor395 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0
[   72.896062][ T9392] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   72.906242][ T9392] Call Trace:
[   72.909524][ T9392]  dump_stack+0x188/0x20d
[   72.913938][ T9392]  ? refcount_warn_saturate+0x150/0x1e0
[   72.919507][ T9392]  panic+0x2e3/0x75c
[   72.923388][ T9392]  ? add_taint.cold+0x16/0x16
[   72.928051][ T9392]  ? __probe_kernel_read+0x188/0x1d0
[   72.933309][ T9392]  ? __warn.cold+0x14/0x35
[   72.937703][ T9392]  ? __warn+0xd5/0x1c8
[   72.941753][ T9392]  ? refcount_warn_saturate+0x1d1/0x1e0
[   72.947276][ T9392]  __warn.cold+0x2f/0x35
[   72.951638][ T9392]  ? refcount_warn_saturate+0x1d1/0x1e0
[   72.957173][ T9392]  report_bug+0x27b/0x2f0
[   72.961488][ T9392]  do_error_trap+0x12b/0x220
[   72.966057][ T9392]  ? refcount_warn_saturate+0x1d1/0x1e0
[   72.971614][ T9392]  do_invalid_op+0x32/0x40
[   72.976006][ T9392]  ? refcount_warn_saturate+0x1d1/0x1e0
[   72.981558][ T9392]  invalid_op+0x23/0x30
[   72.985726][ T9392] RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0
[   72.991862][ T9392] Code: e9 db fe ff ff 48 89 df e8 1c e7 1f fe e9 8a fe ff ff e8 12 c6 e2 fd 48 c7 c7 40 db 71 88 c6 05 b6 a9 f1 06 01 e8 77 91 b4 fd <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55
[   73.011440][ T9392] RSP: 0018:ffffc90002097d38 EFLAGS: 00010286
[   73.017532][ T9392] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   73.025484][ T9392] RDX: 0000000000000000 RSI: ffffffff815c4e91 RDI: fffff52000412f99
[   73.033435][ T9392] RBP: 0000000000000003 R08: ffff8880a2184240 R09: 0000000000000000
[   73.041382][ T9392] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a26e0040
[   73.049337][ T9392] R13: ffff8880a26e0044 R14: 00000000000002ac R15: ffff88809c49b580
[   73.057321][ T9392]  ? vprintk_func+0x81/0x17e
[   73.061900][ T9392]  ? refcount_warn_saturate+0x1d1/0x1e0
[   73.067424][ T9392]  free_nsproxy+0x445/0x4a0
[   73.071907][ T9392]  switch_task_namespaces+0xaa/0xc0
[   73.077102][ T9392]  do_exit+0xb4e/0x2e10
[   73.081257][ T9392]  ? mm_update_next_owner+0x7a0/0x7a0
[   73.086604][ T9392]  ? up_read+0x1a8/0x750
[   73.090828][ T9392]  ? down_read_nested+0x430/0x430
[   73.095830][ T9392]  ? handle_mm_fault+0x29e/0x660
[   73.100766][ T9392]  do_group_exit+0x125/0x340
[   73.105347][ T9392]  __x64_sys_exit_group+0x3a/0x50
[   73.110350][ T9392]  do_syscall_64+0xf6/0x790
[   73.114835][ T9392]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   73.120732][ T9392] RIP: 0033:0x43f998
[   73.124606][ T9392] Code: 24 38 80 f9 3a 0f 85 5f 01 00 00 48 8d 74 24 34 48 8d 7c 24 38 83 ea 01 89 54 24 34 e8 61 f8 ff ff 83 f8 3c 41 89 c1 0f 87 3d <01> 00 00 8b 4c 24 34 85 c9 0f 8e 59 01 00 00 48 8b 54 24 38 c7 44
[   73.144187][ T9392] RSP: 002b:00007ffc7abf1ea8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   73.152583][ T9392] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000043f998
[   73.160543][ T9392] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001
[   73.168493][ T9392] RBP: 00000000004bfa10 R08: 00000000000000e7 R09: ffffffffffffffd0
[   73.176444][ T9392] R10: 0000000120080522 R11: 0000000000000246 R12: 0000000000000001
[   73.184392][ T9392] R13: 00000000006d11c0 R14: 0000000000000000 R15: 0000000000000000
[   73.193904][ T9392] Kernel Offset: disabled
[   73.198283][ T9392] Rebooting in 86400 seconds..