============================================ WARNING: possible recursive locking detected 6.8.0-rc6-syzkaller-gcf1182944c7c #0 Not tainted -------------------------------------------- syz-executor.3/5599 is trying to acquire lock: ffffffff8ea63f18 (qp_broker_list.mutex){+.+.}-{3:3}, at: vmci_qp_broker_detach+0xf5/0x1220 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095 but task is already holding lock: ffffffff8ea63f18 (qp_broker_list.mutex){+.+.}-{3:3}, at: vmci_qp_broker_detach+0xf5/0x1220 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.3/5599: #0: ffffffff8ea63f18 (qp_broker_list.mutex){+.+.}-{3:3}, at: vmci_qp_broker_detach+0xf5/0x1220 drivers/misc/vmw_vmci/vmci_queue_pair.c:2095 stack backtrace: CPU: 1 PID: 5599 Comm: syz-executor.3 Not tainted 6.8.0-rc6-syzkaller-gcf1182944c7c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain+0x15c0/0x58e0 kernel/locking/lockdep.c:3856 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 vmci_qp_broker_detach+0xf5/0x1220 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+0x804/0xe40 drivers/misc/vmw_vmci/vmci_context.c:497 vmci_ctx_enqueue_datagram+0x392/0x430 drivers/misc/vmw_vmci/vmci_context.c:360 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:275 [inline] vmci_datagram_dispatch+0x445/0xbe0 drivers/misc/vmw_vmci/vmci_datagram.c:339 qp_notify_peer drivers/misc/vmw_vmci/vmci_queue_pair.c:1481 [inline] vmci_qp_broker_detach+0xb5d/0x1220 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+0x804/0xe40 drivers/misc/vmw_vmci/vmci_context.c:497 vmci_host_close+0x9b/0x160 drivers/misc/vmw_vmci/vmci_host.c:143 __fput+0x42b/0x8a0 fs/file_table.c:376 __do_sys_close fs/open.c:1554 [inline] __se_sys_close fs/open.c:1539 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1539 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f05aa47868a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 f3 7b 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 53 7c 02 00 8b 44 24 RSP: 002b:00007ffe0082dba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f05aa47868a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: ffffffffffffffff R08: 00007f05aa58bf60 R09: 00007f05aa58bf6c R10: 00007ffe0082dd20 R11: 0000000000000293 R12: 000000000001c703 R13: 00007f05aa58bf60 R14: 000000000001c713 R15: 00007f05aa990000