============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.7.4736/23209 is trying to acquire lock:
ffffffff8edb7e28 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0xe9/0xeb0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

but task is already holding lock:
ffffffff8edb7e28 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0xe9/0xeb0 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.7.4736/23209: 1, last CPU#1:
 #0: ffffffff8edb7e28 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0xe9/0xeb0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

stack backtrace:
CPU: 1 UID: 0 PID: 23209 Comm: syz.7.4736 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x27a/0x290 kernel/locking/lockdep.c:3057
 check_deadlock kernel/locking/lockdep.c:3109 [inline]
 validate_chain kernel/locking/lockdep.c:3911 [inline]
 __lock_acquire+0x261c/0x2e40 kernel/locking/lockdep.c:5254
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5906
 __mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline]
 mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578
 vmci_qp_broker_detach+0xe9/0xeb0 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+0x87e/0xeb0 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+0x91/0x140 drivers/misc/vmw_vmci/vmci_host.c:143
 __fput+0x42a/0xa80 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:339 [inline]
 do_syscall_64+0x33d/0x530 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0dd997de99
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:00007ffddf429518 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f0dd9c07da0 RCX: 00007f0dd997de99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f0dd9c07da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f0dd9c07cb0 R11: 0000000000000246 R12: 0000000000180571
R13: 00007f0dd9c0609c R14: 000000000018032a R15: 00007f0dd9c06090
 </TASK>