============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.0/5317 is trying to acquire lock:
ffffffff8f627030 (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:
ffffffff8f627030 (qp_broker_list.mutex){+.+.}-{4:4}, at: qp_broker_alloc+0x19f/0x2080 drivers/misc/vmw_vmci/vmci_queue_pair.c:1731

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.0.0/5317:
 #0: ffffffff8f627030 (qp_broker_list.mutex){+.+.}-{4:4}, at: qp_broker_alloc+0x19f/0x2080 drivers/misc/vmw_vmci/vmci_queue_pair.c:1731

stack backtrace:
CPU: 0 UID: 0 PID: 5317 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x24df/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x19d/0x1550 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+0x161/0x210 drivers/misc/vmw_vmci/vmci_queue_pair.c:1481
 qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1664 [inline]
 qp_broker_alloc+0x1901/0x2080 drivers/misc/vmw_vmci/vmci_queue_pair.c:1752
 vmci_qp_broker_alloc+0x92/0xc0 drivers/misc/vmw_vmci/vmci_queue_pair.c:1942
 vmci_host_do_alloc_queuepair drivers/misc/vmw_vmci/vmci_host.c:495 [inline]
 vmci_host_unlocked_ioctl+0x14bc/0x2850 drivers/misc/vmw_vmci/vmci_host.c:934
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdf3219e0d9
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:00007fdf330b4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdf32426090 RCX: 00007fdf3219e0d9
RDX: 0000200000000540 RSI: 00000000000007a8 RDI: 0000000000000009
RBP: 00007fdf32235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdf32426128 R14: 00007fdf32426090 R15: 00007ffd99eb4768
 </TASK>