============================================ WARNING: possible recursive locking detected 4.19.196-syzkaller #0 Not tainted -------------------------------------------- syz-executor.1/31544 is trying to acquire lock: 00000000d592a843 (qp_broker_list.mutex){+.+.}, at: vmci_qp_broker_detach+0x147/0x11b0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2099 but task is already holding lock: 00000000d592a843 (qp_broker_list.mutex){+.+.}, at: vmci_qp_broker_detach+0x147/0x11b0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2099 befs: (loop0): unable to read superblock 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.1/31544: #0: 00000000d592a843 (qp_broker_list.mutex){+.+.}, at: vmci_qp_broker_detach+0x147/0x11b0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2099 stack backtrace: CPU: 0 PID: 31544 Comm: syz-executor.1 Not tainted 4.19.196-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+0x1fc/0x2ef lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:1764 [inline] check_deadlock kernel/locking/lockdep.c:1808 [inline] validate_chain kernel/locking/lockdep.c:2404 [inline] __lock_acquire.cold+0x121/0x57e kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:938 [inline] __mutex_lock+0xd7/0x1200 kernel/locking/mutex.c:1083 vmci_qp_broker_detach+0x147/0x11b0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2099 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:452 [inline] kref_put include/linux/kref.h:70 [inline] vmci_ctx_put+0x55a/0xd60 drivers/misc/vmw_vmci/vmci_context.c:505 vmci_ctx_enqueue_datagram+0x3f7/0x500 drivers/misc/vmw_vmci/vmci_context.c:368 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:283 [inline] vmci_datagram_dispatch+0x39b/0xb40 drivers/misc/vmw_vmci/vmci_datagram.c:347 qp_notify_peer+0x182/0x260 drivers/misc/vmw_vmci/vmci_queue_pair.c:1488 vmci_qp_broker_detach+0xa09/0x11b0 drivers/misc/vmw_vmci/vmci_queue_pair.c:2192 ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:452 [inline] kref_put include/linux/kref.h:70 [inline] vmci_ctx_put+0x55a/0xd60 drivers/misc/vmw_vmci/vmci_context.c:505 vmci_host_close+0x116/0x1a0 drivers/misc/vmw_vmci/vmci_host.c:147 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4193eb 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:00007ffe64969840 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193eb RDX: 0000000000570620 RSI: 00007f99e71ad480 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b33421f6c R10: 0000000000000a8b R11: 0000000000000293 R12: 000000000008fc55 R13: 00000000000003e8 R14: 000000000056bf80 R15: 000000000008fc33 print_req_error: 70 callbacks suppressed print_req_error: I/O error, dev loop3, sector 0 print_req_error: I/O error, dev loop3, sector 0 print_req_error: I/O error, dev loop3, sector 0 buffer_io_error: 60 callbacks suppressed Buffer I/O error on dev loop3p2, logical block 0, async page read print_req_error: I/O error, dev loop3, sector 0 Buffer I/O error on dev loop3p4, logical block 0, async page read print_req_error: I/O error, dev loop3, sector 1 Buffer I/O error on dev loop3p4, logical block 1, async page read print_req_error: I/O error, dev loop3, sector 2 Buffer I/O error on dev loop3p4, logical block 2, async page read print_req_error: I/O error, dev loop3, sector 3 Buffer I/O error on dev loop3p4, logical block 3, async page read print_req_error: I/O error, dev loop3, sector 4 Buffer I/O error on dev loop3p4, logical block 4, async page read print_req_error: I/O error, dev loop3, sector 0 Buffer I/O error on dev loop3p2, logical block 0, async page read print_req_error: I/O error, dev loop3, sector 0 Buffer I/O error on dev loop3p2, logical block 0, async page read Buffer I/O error on dev loop3p2, logical block 0, async page read Buffer I/O error on dev loop3p2, logical block 0, async page read kvm [31581]: vcpu0, guest rIP: 0x145 Hyper-V unhandled rdmsr: 0x40000007 kvm [31581]: vcpu0, guest rIP: 0x145 Hyper-V unhandled rdmsr: 0x40000007 kvm [31581]: vcpu0, guest rIP: 0x145 Hyper-V unhandled rdmsr: 0x40000036 kvm [31581]: vcpu0, guest rIP: 0x145 Hyper-V unhandled rdmsr: 0x4000008e kvm [31581]: vcpu0, guest rIP: 0x145 Hyper-V unhandled rdmsr: 0x40000078 Bluetooth: hci4: command 0x0406 tx timeout