============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.4.507/7830 is trying to acquire lock:
ffffffff90e81c50 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0x14c/0x11e0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

but task is already holding lock:
ffffffff90e81c50 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0x14c/0x11e0 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.4.507/7830: 1, last CPU#1:
 #0: ffffffff90e81c50 (qp_broker_list.mutex){+.+.}-{4:4}, at: vmci_qp_broker_detach+0x14c/0x11e0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095

stack backtrace:
CPU: 1 UID: 0 PID: 7830 Comm: syz.4.507 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_deadlock_bug.cold+0xbd/0xca kernel/locking/lockdep.c:3085
 check_deadlock kernel/locking/lockdep.c:3137 [inline]
 validate_chain kernel/locking/lockdep.c:3939 [inline]
 __lock_acquire+0x13f4/0x1f40 kernel/locking/lockdep.c:5288
 lock_acquire kernel/locking/lockdep.c:5942 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x19f/0x1c10 kernel/locking/mutex.c:821
 vmci_qp_broker_detach+0x14c/0x11e0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095
 ctx_free_ctx+0x517/0xda0 drivers/misc/vmw_vmci/vmci_context.c:424
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put drivers/misc/vmw_vmci/vmci_context.c:477 [inline]
 vmci_ctx_enqueue_datagram+0x4be/0x5f0 drivers/misc/vmw_vmci/vmci_context.c:340
 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:276 [inline]
 vmci_datagram_dispatch+0x3db/0xc60 drivers/misc/vmw_vmci/vmci_datagram.c:340
 qp_notify_peer+0x1a6/0x230 drivers/misc/vmw_vmci/vmci_queue_pair.c:1481
 vmci_qp_broker_detach+0xa20/0x11e0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2188
 ctx_free_ctx+0x517/0xda0 drivers/misc/vmw_vmci/vmci_context.c:424
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put drivers/misc/vmw_vmci/vmci_context.c:477 [inline]
 vmci_ctx_destroy+0x150/0x1c0 drivers/misc/vmw_vmci/vmci_context.c:195
 vmci_host_close+0x115/0x1a0 drivers/misc/vmw_vmci/vmci_host.c:143
 __fput+0x3fb/0xb50 fs/file_table.c:512
 fput_close_sync+0x118/0x250 fs/file_table.c:618
 filp_close_sync+0x75/0xa0 fs/open.c:1573
 __do_sys_close fs/open.c:1596 [inline]
 __se_sys_close fs/open.c:1583 [inline]
 __x64_sys_close+0x81/0x110 fs/open.c:1583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f235439f559
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:00007f2355181028 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f2354625fa0 RCX: 00007f235439f559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f2354436b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2354626038 R14: 00007f2354625fa0 R15: 00007ffd6f7c6fa8
 </TASK>