====================================================== WARNING: possible circular locking dependency detected do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 5.10.221 #1 Not tainted entry_SYSCALL_64_after_hwframe+0x67/0xd1 ------------------------------------------------------ RIP: 0033:0x7ffafe449b19 syz-executor.7/6576 is trying to acquire lock: ffff88800ef90b78 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:00007ffafb9bf188 EFLAGS: 00000246 (work_completion)(&hdev->bg_scan_update) ORIG_RAX: 0000000000000039 ){+.+.}-{0:0} RAX: ffffffffffffffda RBX: 00007ffafe55cf60 RCX: 00007ffafe449b19 , at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 but task is already holding lock: ffffffff8561c508 RBP: 00007ffafb9bf1d0 R08: 0000000000000000 R09: 0000000000000000 (rfkill_global_mutex R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 ){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 R13: 00007ffd85fa9e2f R14: 00007ffafb9bf300 R15: 0000000000022000 which lock already depends on the new lock. 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 ieee80211 €˜§°ÇÛ ”uòQÇC !: Selected rate control algorithm 'minstrel_ht' rfkill_register+0x36/0xa10 net/rfkill/core.c:1016 hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3774 __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:328 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298 -> #3 (&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:4061 hci_sched_acl_pkt net/bluetooth/hci_core.c:4586 [inline] hci_sched_acl net/bluetooth/hci_core.c:4671 [inline] hci_tx_work+0x10af/0x1660 net/bluetooth/hci_core.c:4742 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:328 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298 -> #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_dev_close+0x175/0x1d0 net/bluetooth/hci_core.c:1865 hci_sock_ioctl+0x288/0x980 net/bluetooth/hci_sock.c:1067 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+0x67/0xd1 debugfs: Directory '€˜§°ÇÛ ”uòQÇC !' with parent 'ieee80211' already present! -> #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:277 [inline] bg_scan_update+0x82/0x500 net/bluetooth/hci_request.c:2897 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:328 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298 -> #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:3440 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/0xb10 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+0x67/0xd1 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.7/6576: #0: ffffffff8561c508 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: CPU: 0 PID: 6576 Comm: syz-executor.7 Not tainted 5.10.221 #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:3440 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/0xb10 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+0x67/0xd1 RIP: 0033:0x7fc555b8fb19 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:00007fc553105188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc555ca2f60 RCX: 00007fc555b8fb19 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fc555be9f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe57efd9df R14: 00007fc553105300 R15: 0000000000022000 audit: type=1326 audit(1721437863.822:399): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6564 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=16 compat=0 ip=0x7fa085a5eb19 code=0x7ffc0000 netlink: 52 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1326 audit(1721437863.822:400): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6564 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7fa085a5eb19 code=0x7ffc0000 audit: type=1326 audit(1721437863.822:401): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6564 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=16 compat=0 ip=0x7fa085a5eb19 code=0x7ffc0000 audit: type=1326 audit(1721437863.822:402): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6564 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7fa085a5eb19 code=0x7ffc0000 audit: type=1326 audit(1721437863.823:403): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6564 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=209 compat=0 ip=0x7fa085a5eb19 code=0x7ffc0000 audit: type=1326 audit(1721437863.823:404): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6564 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7fa085a5eb19 code=0x7ffc0000 audit: type=1326 audit(1721437863.823:405): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=6564 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=186 compat=0 ip=0x7fa085a5eb19 code=0x7ffc0000 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.6'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=6591 comm=syz-executor.6 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.6'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=6592 comm=syz-executor.6 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 6595 Comm: syz-executor.3 Not tainted 5.10.221 #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] __kmalloc+0x16e/0x390 mm/slub.c:3967 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] lsm_cred_alloc security/security.c:536 [inline] security_prepare_creds+0x112/0x190 security/security.c:1667 prepare_creds+0x452/0x5e0 kernel/cred.c:285 copy_creds+0x72/0x580 kernel/cred.c:358 copy_process+0xfdc/0x7800 kernel/fork.c:2002 kernel_clone+0xe7/0x980 kernel/fork.c:2506 __do_sys_fork+0x8a/0xc0 kernel/fork.c:2569 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 RIP: 0033:0x7ffafe449b19 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:00007ffafb9bf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000039 RAX: ffffffffffffffda RBX: 00007ffafe55cf60 RCX: 00007ffafe449b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffafb9bf1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd85fa9e2f R14: 00007ffafb9bf300 R15: 0000000000022000 sr 1:0:0:0: [sr0] tag#0 unaligned transfer print_req_error: 22 callbacks suppressed blk_update_request: I/O error, dev sr0, sector 2096896 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 blk_update_request: I/O error, dev loop4, sector 2096896 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 sr 1:0:0:0: [sr0] tag#0 unaligned transfer buffer_io_error: 6 callbacks suppressed Buffer I/O error on dev loop4, logical block 2096896, async page read blk_update_request: I/O error, dev sr0, sector 2096897 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 blk_update_request: I/O error, dev loop4, sector 2096897 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 sr 1:0:0:0: [sr0] tag#0 unaligned transfer Buffer I/O error on dev loop4, logical block 2096897, async page read blk_update_request: I/O error, dev sr0, sector 2096898 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 blk_update_request: I/O error, dev loop4, sector 2096898 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 sr 1:0:0:0: [sr0] tag#0 unaligned transfer Buffer I/O error on dev loop4, logical block 2096898, async page read blk_update_request: I/O error, dev sr0, sector 2096899 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 blk_update_request: I/O error, dev loop4, sector 2096899 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 sr 1:0:0:0: [sr0] tag#0 unaligned transfer Buffer I/O error on dev loop4, logical block 2096899, async page read blk_update_request: I/O error, dev sr0, sector 2096900 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 blk_update_request: I/O error, dev loop4, sector 2096900 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 sr 1:0:0:0: [sr0] tag#0 unaligned transfer Buffer I/O error on dev loop4, logical block 2096900, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer Buffer I/O error on dev loop4, logical block 2096901, async page read Buffer I/O error on dev loop4, logical block 2096902, async page read Buffer I/O error on dev loop4, logical block 2096903, async page read ieee80211 €˜§°ÇÛ ”uòQÇC !: Selected rate control algorithm 'minstrel_ht' sysfs: cannot create duplicate filename '/class/ieee80211/€˜§°ÇÛ ”uòQÇC !' CPU: 1 PID: 6575 Comm: syz-executor.1 Not tainted 5.10.221 #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 sysfs_warn_dup.cold+0x1c/0x29 fs/sysfs/dir.c:30 sysfs_do_create_link_sd+0x122/0x140 fs/sysfs/symlink.c:51 sysfs_do_create_link fs/sysfs/symlink.c:80 [inline] sysfs_create_link+0x5f/0xc0 fs/sysfs/symlink.c:92 device_add_class_symlinks drivers/base/core.c:2751 [inline] device_add+0x703/0x1c50 drivers/base/core.c:2959 wiphy_register+0x1da6/0x2850 net/wireless/core.c:915 ieee80211_register_hw+0x23c5/0x38b0 net/mac80211/main.c:1293 mac80211_hwsim_new_radio+0x1ce0/0x4250 drivers/net/wireless/mac80211_hwsim.c:3300 hwsim_new_radio_nl+0x991/0x1080 drivers/net/wireless/mac80211_hwsim.c:3881 genl_family_rcv_msg_doit+0x22d/0x330 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x33c/0x5a0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x14b/0x430 net/netlink/af_netlink.c:2500 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x549/0x7f0 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x90f/0xdf0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:651 [inline] __sock_sendmsg+0x154/0x190 net/socket.c:663 ____sys_sendmsg+0x70d/0x870 net/socket.c:2378 ___sys_sendmsg+0xf3/0x170 net/socket.c:2432 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2461 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 RIP: 0033:0x7f31c0187b19 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:00007f31bd6fd188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f31c029af60 RCX: 00007f31c0187b19 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 00007f31c01e1f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9155371f R14: 00007f31bd6fd300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall * 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W