CPU: 0 PID: 8272 Comm: syz-executor.0 Not tainted 5.10.209 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 ====================================================== WARNING: possible circular locking dependency detected Call Trace: 5.10.209 #1 Not tainted __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 ------------------------------------------------------ syz-executor.7/8269 is trying to acquire lock: fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 ffff888017cc0b78 ( should_failslab+0x5/0x20 mm/slab_common.c:1193 (work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0} slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2821 [inline] __kmalloc_node_track_caller+0x74/0x3b0 mm/slub.c:4496 , at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff85619668 ( __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xb1/0x5b0 net/core/skbuff.c:210 rfkill_global_mutex){+.+.}-{3:3} alloc_skb include/linux/skbuff.h:1102 [inline] __skb_tstamp_tx+0x168/0x8d0 net/core/skbuff.c:4761 , at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 which lock already depends on the new lock. __dev_queue_xmit+0x1770/0x2710 net/core/dev.c:4115 the existing dependency chain (in reverse order) is: -> #4 (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 neigh_connected_output+0x382/0x4d0 net/core/neighbour.c:1538 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0xaaf/0x1fe0 net/ipv6/ip6_output.c:145 -> #3 ( __ip6_finish_output.part.0+0x4f7/0xbc0 net/ipv6/ip6_output.c:216 &data->open_mutex){+.+.}-{3:3} __ip6_finish_output include/linux/skbuff.h:972 [inline] ip6_finish_output net/ipv6/ip6_output.c:226 [inline] NF_HOOK_COND include/linux/netfilter.h:285 [inline] ip6_output+0x3aa/0x7e0 net/ipv6/ip6_output.c:249 : __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 dst_output include/net/dst.h:436 [inline] ip6_local_out+0xb4/0x1a0 net/ipv6/output_core.c:161 vhci_send_frame+0x63/0xa0 drivers/bluetooth/hci_vhci.c:71 hci_send_frame+0x1b9/0x320 net/bluetooth/hci_core.c:4060 ip6_send_skb+0xb7/0x350 net/ipv6/ip6_output.c:1955 hci_sched_acl_pkt net/bluetooth/hci_core.c:4585 [inline] hci_sched_acl net/bluetooth/hci_core.c:4670 [inline] hci_tx_work+0x10af/0x1660 net/bluetooth/hci_core.c:4741 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 udp_v6_send_skb+0x7aa/0x15b0 net/ipv6/udp.c:1256 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 udpv6_sendmsg+0x2113/0x2af0 net/ipv6/udp.c:1556 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #2 ((work_completion)(&hdev->tx_work) ){+.+.}-{0:0}: __flush_work+0x105/0xa90 kernel/workqueue.c:3053 hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745 hci_unregister_dev+0x149/0x430 net/bluetooth/hci_core.c:3849 vhci_release+0x70/0xf0 drivers/bluetooth/hci_vhci.c:345 __fput+0x285/0x980 fs/file_table.c:281 task_work_run+0xe2/0x1a0 kernel/task_work.c:161 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xb6f/0x2600 kernel/exit.c:858 do_group_exit+0x125/0x310 kernel/exit.c:980 get_signal+0x4bc/0x22e0 kernel/signal.c:2751 arch_do_signal_or_restart+0x2b7/0x1990 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x10f/0x190 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x38/0x1e0 kernel/entry/common.c:274 entry_SYSCALL_64_after_hwframe+0x62/0xc7 -> #1 (&hdev->req_lock inet6_sendmsg+0x105/0x140 net/ipv6/af_inet6.c:651 ){+.+.}-{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 sock_sendmsg_nosec net/socket.c:651 [inline] __sock_sendmsg+0xf2/0x190 net/socket.c:663 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 ____sys_sendmsg+0x334/0x870 net/socket.c:2378 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 ___sys_sendmsg+0xf3/0x170 net/socket.c:2432 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 __sys_sendmmsg+0x195/0x470 net/socket.c:2518 ---- ---- 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.7/8269: #0: ffffffff85619668 ( rfkill_global_mutex){+.+.}-{3:3} __do_sys_sendmmsg net/socket.c:2547 [inline] __se_sys_sendmmsg net/socket.c:2544 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2544 , at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7f3be3f72b19 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:00007f3be14e8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f3be4085f60 RCX: 00007f3be3f72b19 RDX: 000000000000002f RSI: 0000000020004d00 RDI: 0000000000000003 RBP: 00007f3be14e81d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020040000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffefc577a4f R14: 00007f3be14e8300 R15: 0000000000022000 CPU: 1 PID: 8269 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: 0033:0x7f61a1948b19 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:00007f619eebe188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f61a1a5bf60 RCX: 00007f61a1948b19 RDX: 0000000000000008 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007f61a19a2f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2d7e8eaf R14: 00007f619eebe300 R15: 0000000000022000 FAT-fs (loop4): Unrecognized mount option "nnonumtail=1" or missing value EXT4-fs (loop2): corrupt root inode, run e2fsck EXT4-fs (loop2): mount failed FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 8292 Comm: syz-executor.0 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_track_caller+0x1a6/0x3b0 mm/slub.c:4496 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xb1/0x5b0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1102 [inline] __skb_tstamp_tx+0x168/0x8d0 net/core/skbuff.c:4761 __dev_queue_xmit+0x1770/0x2710 net/core/dev.c:4115 neigh_connected_output+0x382/0x4d0 net/core/neighbour.c:1538 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0xaaf/0x1fe0 net/ipv6/ip6_output.c:145 __ip6_finish_output.part.0+0x4f7/0xbc0 net/ipv6/ip6_output.c:216 __ip6_finish_output include/linux/skbuff.h:972 [inline] ip6_finish_output net/ipv6/ip6_output.c:226 [inline] NF_HOOK_COND include/linux/netfilter.h:285 [inline] ip6_output+0x3aa/0x7e0 net/ipv6/ip6_output.c:249 dst_output include/net/dst.h:436 [inline] ip6_local_out+0xb4/0x1a0 net/ipv6/output_core.c:161 ip6_send_skb+0xb7/0x350 net/ipv6/ip6_output.c:1955 udp_v6_send_skb+0x7aa/0x15b0 net/ipv6/udp.c:1256 udpv6_sendmsg+0x2113/0x2af0 net/ipv6/udp.c:1556 inet6_sendmsg+0x105/0x140 net/ipv6/af_inet6.c:651 sock_sendmsg_nosec net/socket.c:651 [inline] __sock_sendmsg+0xf2/0x190 net/socket.c:663 ____sys_sendmsg+0x334/0x870 net/socket.c:2378 ___sys_sendmsg+0xf3/0x170 net/socket.c:2432 __sys_sendmmsg+0x195/0x470 net/socket.c:2518 __do_sys_sendmmsg net/socket.c:2547 [inline] __se_sys_sendmmsg net/socket.c:2544 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2544 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7f3be3f72b19 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:00007f3be14e8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f3be4085f60 RCX: 00007f3be3f72b19 RDX: 000000000000002f RSI: 0000000020004d00 RDI: 0000000000000003 RBP: 00007f3be14e81d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020040000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffefc577a4f R14: 00007f3be14e8300 R15: 0000000000022000 FAT-fs (loop4): Unrecognized mount option "nnonumtail=1" or missing value EXT4-fs (loop2): corrupt root inode, run e2fsck EXT4-fs (loop2): mount failed FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 8309 Comm: syz-executor.0 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 skb_clone+0x14f/0x3d0 net/core/skbuff.c:1456 dev_queue_xmit_nit+0x3a7/0xb00 net/core/dev.c:2343 xmit_one net/core/dev.c:3595 [inline] dev_hard_start_xmit+0xab/0x6f0 net/core/dev.c:3616 __dev_queue_xmit+0x17ec/0x2710 net/core/dev.c:4183 neigh_connected_output+0x382/0x4d0 net/core/neighbour.c:1538 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0xaaf/0x1fe0 net/ipv6/ip6_output.c:145 __ip6_finish_output.part.0+0x4f7/0xbc0 net/ipv6/ip6_output.c:216 __ip6_finish_output include/linux/skbuff.h:972 [inline] ip6_finish_output net/ipv6/ip6_output.c:226 [inline] NF_HOOK_COND include/linux/netfilter.h:285 [inline] ip6_output+0x3aa/0x7e0 net/ipv6/ip6_output.c:249 dst_output include/net/dst.h:436 [inline] ip6_local_out+0xb4/0x1a0 net/ipv6/output_core.c:161 ip6_send_skb+0xb7/0x350 net/ipv6/ip6_output.c:1955 udp_v6_send_skb+0x7aa/0x15b0 net/ipv6/udp.c:1256 udpv6_sendmsg+0x2113/0x2af0 net/ipv6/udp.c:1556 inet6_sendmsg+0x105/0x140 net/ipv6/af_inet6.c:651 sock_sendmsg_nosec net/socket.c:651 [inline] __sock_sendmsg+0xf2/0x190 net/socket.c:663 ____sys_sendmsg+0x334/0x870 net/socket.c:2378 ___sys_sendmsg+0xf3/0x170 net/socket.c:2432 __sys_sendmmsg+0x195/0x470 net/socket.c:2518 __do_sys_sendmmsg net/socket.c:2547 [inline] __se_sys_sendmmsg net/socket.c:2544 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2544 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7f3be3f72b19 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:00007f3be14e8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f3be4085f60 RCX: 00007f3be3f72b19 RDX: 000000000000002f RSI: 0000000020004d00 RDI: 0000000000000003 RBP: 00007f3be14e81d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020040000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffefc577a4f R14: 00007f3be14e8300 R15: 0000000000022000 EXT4-fs error (device loop2): ext4_fill_super:4962: inode #2: comm syz-executor.2: iget: special inode unallocated EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed EXT4-fs (loop4): corrupt root inode, run e2fsck EXT4-fs (loop4): mount failed EXT4-fs error (device loop2): ext4_fill_super:4962: inode #2: comm syz-executor.2: iget: special inode unallocated EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed SELinux: unrecognized netlink message: protocol=6 nlmsg_type=35144 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=34247 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=53893 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=53481 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=35656 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=33608 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=35140 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=41 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=51 sclass=netlink_xfrm_socket pid=8331 comm=syz-executor.7