============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.440/7653 is trying to acquire lock:
ffffffff90c679d0 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0xe9/0xec0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

but task is already holding lock:
ffffffff90c679d0 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0xe9/0xec0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(qp_broker_list.mutex);
  lock(qp_broker_list.mutex);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

locks held by syz.0.440/7653: 1, last CPU#0:
 #0: ffffffff90c679d0 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0xe9/0xec0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

stack backtrace:
CPU: 0 UID: 0 PID: 7653 Comm: syz.0.440 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x27a/0x290 kernel/locking/lockdep.c:3085
 check_deadlock kernel/locking/lockdep.c:3137 [inline]
 validate_chain kernel/locking/lockdep.c:3939 [inline]
 __lock_acquire+0x25db/0x2de0 kernel/locking/lockdep.c:5288
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
 vmci_qp_broker_detach+0xe9/0xec0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095
 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:424 [inline]
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put+0x619/0xc00 drivers/misc/vmw_vmci/vmci_context.c:477
 vmci_ctx_enqueue_datagram+0x3c3/0x440 drivers/misc/vmw_vmci/vmci_context.c:340
 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:276 [inline]
 vmci_datagram_dispatch+0x450/0xc80 drivers/misc/vmw_vmci/vmci_datagram.c:340
 qp_notify_peer drivers/misc/vmw_vmci/vmci_queue_pair.c:1481 [inline]
 vmci_qp_broker_detach+0x887/0xec0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2188
 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:424 [inline]
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put+0x619/0xc00 drivers/misc/vmw_vmci/vmci_context.c:477
 vmci_host_close+0x8e/0x140 drivers/misc/vmw_vmci/vmci_host.c:143
 __fput+0x408/0xa40 fs/file_table.c:512
 fput_close_sync+0x11f/0x240 fs/file_table.c:618
 filp_close_sync+0x6e/0xa0 fs/open.c:1574
 __range_close fs/file.c:919 [inline]
 __do_sys_close_range fs/file.c:1003 [inline]
 __se_sys_close_range+0xa77/0xef0 fs/file.c:954
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb8a79978f9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcaef40d18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fb8a7bc7ba0 RCX: 00007fb8a79978f9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb8a7bc7ba0 R08: 00007fb8a7bc6038 R09: 0000000000000000
R10: 000000000003fda8 R11: 0000000000000246 R12: 0000000000030176
R13: 00007fb8a7bc5fac R14: 000000000002fe6a R15: 00007ffcaef40e20
 </TASK>