=====================================
WARNING: bad unlock balance detected!
6.0.0-rc1-syzkaller #0 Not tainted
-------------------------------------
syz-executor.2/3672 is trying to release lock (
&call->user_mutex) at:
[<ffffffff8878d021>] rxrpc_do_sendmsg+0xe31/0x1360
but there are no more locks to release!

other info that might help us debug this:
no locks held by syz-executor.2/3672.

stack backtrace:
CPU: 0 PID: 3672 Comm: syz-executor.2 Not tainted 6.0.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 dump_stack_lvl+0xfc/0x174
 lock_release.cold+0x10/0x4e
 __mutex_unlock_slowpath+0x9a/0x630
 rxrpc_do_sendmsg+0xe31/0x1360
 rxrpc_sendmsg+0x41a/0x5e0
 sock_sendmsg+0xc9/0x120
 ____sys_sendmsg+0x631/0x810
 ___sys_sendmsg+0x11d/0x1b0
 __sys_sendmsg+0xf6/0x1c0
 do_syscall_64+0x34/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f0eb4c7df69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0eb5a020c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0eb4dabf80 RCX: 00007f0eb4c7df69
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f0eb4cca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0eb4dabf80 R15: 00007fffd87b5188
 </TASK>
