============================================
WARNING: possible recursive locking detected
6.15.0-rc5-syzkaller-g92a09c47464d #0 Not tainted
--------------------------------------------
syz-executor.5/6300 is trying to acquire lock:
ffffffff8e929758 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0x113/0xf10 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

but task is already holding lock:
ffffffff8e929758 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0x113/0xf10 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

1 lock held by syz-executor.5/6300:
 #0: ffffffff8e929758 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0x113/0xf10 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

stack backtrace:
CPU: 1 UID: 0 PID: 6300 Comm: syz-executor.5 Not tainted 6.15.0-rc5-syzkaller-g92a09c47464d #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3042
 check_deadlock kernel/locking/lockdep.c:3094 [inline]
 validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3896
 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
 vmci_qp_broker_detach+0x113/0xf10 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095
 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:444 [inline]
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put+0x5ef/0xbe0 drivers/misc/vmw_vmci/vmci_context.c:497
 vmci_ctx_enqueue_datagram+0x3ab/0x420 drivers/misc/vmw_vmci/vmci_context.c:360
 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:276 [inline]
 vmci_datagram_dispatch+0x43f/0xc10 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+0x8c8/0xf10 drivers/misc/vmw_vmci/vmci_queue_pair.c:2188
 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:444 [inline]
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put+0x5ef/0xbe0 drivers/misc/vmw_vmci/vmci_context.c:497
 vmci_host_close+0x98/0x160 drivers/misc/vmw_vmci/vmci_host.c:143
 __fput+0x449/0xa70 fs/file_table.c:465
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x9a/0x120 kernel/entry/common.c:218
 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x456c29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5b7d7590d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000124
RAX: 0000000000000003 RBX: 000000000055bf60 RCX: 0000000000456c29
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00000000004b09d6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004affcd
R13: 000000000000000b R14: 000000000055bf60 R15: 0000000000a8fa68
 </TASK>