====================================================== WARNING: possible circular locking dependency detected 5.10.209 #1 Not tainted ------------------------------------------------------ syz-executor.7/13989 is trying to acquire lock: ffff8880175f8b78 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff85619668 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (rfkill_global_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 rfkill_register+0x36/0xa10 net/rfkill/core.c:1016 hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3773 __vhci_create_device+0x2c8/0x5c0 drivers/bluetooth/hci_vhci.c:129 vhci_create_device drivers/bluetooth/hci_vhci.c:153 [inline] vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:310 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #4 (&data->open_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 vhci_send_frame+0x63/0xa0 drivers/bluetooth/hci_vhci.c:71 hci_send_frame+0x1b9/0x320 net/bluetooth/hci_core.c:4060 hci_cmd_work+0x15e/0x2d0 net/bluetooth/hci_core.c:5005 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #3 ((work_completion)(&hdev->cmd_work)){+.+.}-{0:0}: process_one_work+0x92d/0x14b0 kernel/workqueue.c:2258 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #2 ((wq_completion)hci0#2){+.+.}-{0:0}: flush_workqueue+0x105/0x1140 kernel/workqueue.c:2793 drain_workqueue+0x1a5/0x3c0 kernel/workqueue.c:2958 hci_dev_do_reset net/bluetooth/hci_core.c:1887 [inline] hci_dev_reset+0x255/0x6b0 net/bluetooth/hci_core.c:1930 hci_sock_ioctl+0x3b2/0x980 net/bluetooth/hci_sock.c:1072 sock_do_ioctl+0xd3/0x300 net/socket.c:1066 sock_ioctl+0x3ea/0x700 net/socket.c:1206 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 -> #1 (&hdev->req_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 hci_req_sync net/bluetooth/hci_request.c:275 [inline] bg_scan_update+0x82/0x500 net/bluetooth/hci_request.c:2895 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #0 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3729 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955 lock_acquire kernel/locking/lockdep.c:5566 [inline] lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531 __flush_work+0x105/0xa90 kernel/workqueue.c:3053 __cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144 hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3438 hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733 hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223 rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341 rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240 vfs_write+0x29a/0xa70 fs/read_write.c:603 ksys_write+0x1f6/0x260 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 other info that might help us debug this: Chain exists of: (work_completion)(&hdev->bg_scan_update) --> &data->open_mutex --> rfkill_global_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rfkill_global_mutex); lock(&data->open_mutex); lock(rfkill_global_mutex); lock((work_completion)(&hdev->bg_scan_update)); *** DEADLOCK *** 1 lock held by syz-executor.7/13989: #0: ffffffff85619668 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: CPU: 1 PID: 13989 Comm: syz-executor.7 Not tainted 5.10.209 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 check_noncircular+0x263/0x2e0 kernel/locking/lockdep.c:2123 check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3729 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955 lock_acquire kernel/locking/lockdep.c:5566 [inline] lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531 __flush_work+0x105/0xa90 kernel/workqueue.c:3053 __cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144 hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3438 hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733 hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223 rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341 rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240 vfs_write+0x29a/0xa70 fs/read_write.c:603 ksys_write+0x1f6/0x260 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7f4425e14b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4423369188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4425f28020 RCX: 00007f4425e14b19 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007f4425e6ef6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe50657d7f R14: 00007f4423369300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 14013 Comm: syz-executor.1 Not tainted 5.10.209 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 should_failslab+0x5/0x20 mm/slab_common.c:1193 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2904 [inline] kmem_cache_alloc+0x5b/0x310 mm/slub.c:2909 mem_pool_alloc mm/kmemleak.c:423 [inline] create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] slab_post_alloc_hook mm/slab.h:534 [inline] slab_alloc_node mm/slub.c:2896 [inline] slab_alloc mm/slub.c:2904 [inline] kmem_cache_alloc_trace+0x151/0x320 mm/slub.c:2921 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] create_mem_extents kernel/power/snapshot.c:607 [inline] memory_bm_create+0x135/0x930 kernel/power/snapshot.c:653 create_basic_memory_bitmaps+0xb9/0x170 kernel/power/snapshot.c:1085 snapshot_open+0x239/0x2b0 kernel/power/user.c:88 misc_open+0x375/0x4a0 drivers/char/misc.c:141 chrdev_open+0x268/0x6e0 fs/char_dev.c:414 do_dentry_open+0x4b7/0x1090 fs/open.c:817 do_open fs/namei.c:3313 [inline] path_openat+0x1937/0x26e0 fs/namei.c:3431 do_filp_open+0x190/0x3e0 fs/namei.c:3458 do_sys_openat2+0x171/0x420 fs/open.c:1186 do_sys_open fs/open.c:1202 [inline] __do_sys_openat fs/open.c:1218 [inline] __se_sys_openat fs/open.c:1213 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1213 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7f14e3d6db19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f14e12e3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f14e3e80f60 RCX: 00007f14e3d6db19 RDX: 0000000000040001 RSI: 0000000020000140 RDI: ffffffffffffff9c RBP: 00007f14e12e31d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffce46c435f R14: 00007f14e12e3300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 14012 Comm: syz-executor.2 Not tainted 5.10.209 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 should_failslab+0x5/0x20 mm/slab_common.c:1193 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2821 [inline] __kmalloc_node+0x76/0x420 mm/slub.c:4015 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x119/0x170 mm/util.c:607 kvmalloc include/linux/mm.h:765 [inline] kvmalloc_array include/linux/mm.h:783 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0xea/0x3d0 net/sched/sch_generic.c:779 qdisc_create_dflt+0x103/0x370 net/sched/sch_generic.c:931 mq_init+0x34a/0x4a0 net/sched/sch_mq.c:90 qdisc_create_dflt+0x103/0x370 net/sched/sch_generic.c:931 attach_default_qdiscs net/sched/sch_generic.c:1110 [inline] dev_activate+0xb21/0xd70 net/sched/sch_generic.c:1164 __dev_open+0x38a/0x4e0 net/core/dev.c:1544 __dev_change_flags+0x521/0x6e0 net/core/dev.c:8507 dev_change_flags+0x8a/0x160 net/core/dev.c:8578 devinet_ioctl+0x14de/0x1db0 net/ipv4/devinet.c:1143 inet_ioctl+0x34f/0x390 net/ipv4/af_inet.c:969 packet_ioctl+0xb3/0x260 net/packet/af_packet.c:4206 sock_do_ioctl+0xd3/0x300 net/socket.c:1066 PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: hibernation: Basic memory bitmaps created sock_ioctl+0x3ea/0x700 net/socket.c:1206 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7faaff576b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007faafcaec188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007faaff689f60 RCX: 00007faaff576b19 RDX: 00000000200001c0 RSI: 0000000000008914 RDI: 0000000000000006 RBP: 00007faafcaec1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffc93e07a1f R14: 00007faafcaec300 R15: 0000000000022000 veth0_vlan: default qdisc (pfifo_fast) fail, fallback to noqueue device veth0_vlan entered promiscuous mode PM: hibernation: Basic memory bitmaps freed rfkill: input handler enabled PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: hibernation: Basic memory bitmaps created PM: hibernation: Basic memory bitmaps freed PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: hibernation: Basic memory bitmaps created FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 14034 Comm: syz-executor.2 Not tainted 5.10.209 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 should_failslab+0x5/0x20 mm/slab_common.c:1193 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2904 [inline] kmem_cache_alloc+0x5b/0x310 mm/slub.c:2909 mem_pool_alloc mm/kmemleak.c:423 [inline] create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] slab_post_alloc_hook mm/slab.h:534 [inline] slab_alloc_node mm/slub.c:2896 [inline] __kmalloc_node+0x1ae/0x420 mm/slub.c:4015 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x119/0x170 mm/util.c:607 kvmalloc include/linux/mm.h:765 [inline] kvmalloc_array include/linux/mm.h:783 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0xea/0x3d0 net/sched/sch_generic.c:779 qdisc_create_dflt+0x103/0x370 net/sched/sch_generic.c:931 mq_init+0x34a/0x4a0 net/sched/sch_mq.c:90 qdisc_create_dflt+0x103/0x370 net/sched/sch_generic.c:931 attach_default_qdiscs net/sched/sch_generic.c:1110 [inline] dev_activate+0xb21/0xd70 net/sched/sch_generic.c:1164 __dev_open+0x38a/0x4e0 net/core/dev.c:1544 __dev_change_flags+0x521/0x6e0 net/core/dev.c:8507 dev_change_flags+0x8a/0x160 net/core/dev.c:8578 devinet_ioctl+0x14de/0x1db0 net/ipv4/devinet.c:1143 inet_ioctl+0x34f/0x390 net/ipv4/af_inet.c:969 packet_ioctl+0xb3/0x260 net/packet/af_packet.c:4206 sock_do_ioctl+0xd3/0x300 net/socket.c:1066 sock_ioctl+0x3ea/0x700 net/socket.c:1206 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7faaff576b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007faafcaec188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007faaff689f60 RCX: 00007faaff576b19 RDX: 00000000200001c0 RSI: 0000000000008914 RDI: 0000000000000006 RBP: 00007faafcaec1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffc93e07a1f R14: 00007faafcaec300 R15: 0000000000022000 PM: hibernation: Basic memory bitmaps freed PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: hibernation: Basic memory bitmaps created PM: hibernation: Basic memory bitmaps freed PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: hibernation: Basic memory bitmaps created device veth0_vlan entered promiscuous mode PM: hibernation: Basic memory bitmaps freed PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: hibernation: Basic memory bitmaps created PM: hibernation: Basic memory bitmaps freed