============================================
WARNING: possible recursive locking detected
5.6.0-rc5-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.2/13606 is trying to acquire lock:
ffffffff8b0fe8d0 (qp_broker_list.mutex){+.+.}, at: vmci_qp_broker_detach+0x122/0xe90 drivers/misc/vmw_vmci/vmci_queue_pair.c:2083

but task is already holding lock:
ffffffff8b0fe8d0 (qp_broker_list.mutex){+.+.}, at: vmci_qp_broker_detach+0x122/0xe90 drivers/misc/vmw_vmci/vmci_queue_pair.c:2083

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.2/13606:
 #0: ffffffff8b0fe8d0 (qp_broker_list.mutex){+.+.}, at: vmci_qp_broker_detach+0x122/0xe90 drivers/misc/vmw_vmci/vmci_queue_pair.c:2083

stack backtrace:
CPU: 1 PID: 13606 Comm: syz-executor.2 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x96/0xe0 lib/dump_stack.c:118
 print_deadlock_bug kernel/locking/lockdep.c:2370 [inline]
 check_deadlock kernel/locking/lockdep.c:2411 [inline]
 validate_chain kernel/locking/lockdep.c:2954 [inline]
 __lock_acquire.cold.54+0x126/0x30e kernel/locking/lockdep.c:3954
 lock_acquire+0x12e/0x360 kernel/locking/lockdep.c:4484
 __mutex_lock_common kernel/locking/mutex.c:956 [inline]
 __mutex_lock+0x153/0x1400 kernel/locking/mutex.c:1103
 vmci_qp_broker_detach+0x122/0xe90 drivers/misc/vmw_vmci/vmci_queue_pair.c:2083
 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:444 [inline]
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put+0x4d8/0xce0 drivers/misc/vmw_vmci/vmci_context.c:497
 vmci_ctx_enqueue_datagram+0x378/0x4a0 drivers/misc/vmw_vmci/vmci_context.c:360
 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:275 [inline]
 vmci_datagram_dispatch drivers/misc/vmw_vmci/vmci_datagram.c:339 [inline]
 vmci_datagram_dispatch+0x279/0x920 drivers/misc/vmw_vmci/vmci_datagram.c:314
 qp_notify_peer+0x1bd/0x210 drivers/misc/vmw_vmci/vmci_queue_pair.c:1472
 vmci_qp_broker_detach+0x45a/0xe90 drivers/misc/vmw_vmci/vmci_queue_pair.c:2176
 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:444 [inline]
 kref_put include/linux/kref.h:65 [inline]
 vmci_ctx_put+0x4d8/0xce0 drivers/misc/vmw_vmci/vmci_context.c:497
 vmci_host_close+0xf3/0x180 drivers/misc/vmw_vmci/vmci_host.c:143
 __fput+0x256/0x790 fs/file_table.c:280
 task_work_run+0xd3/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x15d/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x4b1/0x560 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x41926b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007fff43c05d90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000041926b
RDX: 0000000000570698 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e0200a8
R10: 00007fff43c05e80 R11: 0000000000000293 R12: 000000000005f415
R13: 00000000000003e8 R14: 000000000056bf60 R15: 000000000005f3f9