program: r0 = ioctl$KVM_CREATE_VCPU(0xffffffffffffffff, 0xae41, 0x1) ioctl$KVM_SET_MSRS(r0, 0x4008ae89, &(0x7f0000000100)={0x2, 0x0, [{0x0, 0x0, 0x7}, {0x2d5, 0x0, 0x2ac3}]}) r1 = socket$inet6_sctp(0xa, 0x5, 0x84) r2 = socket$inet(0x2, 0x80001, 0x84) getsockopt$inet_sctp_SCTP_MAX_BURST(r2, 0x84, 0x14, &(0x7f0000000000)=@assoc_value={0x0}, &(0x7f0000000040)=0x8) setsockopt$inet_sctp6_SCTP_DEFAULT_SNDINFO(r1, 0x84, 0x22, &(0x7f0000000040)={0x0, 0x0, 0x0, 0x0, r3}, 0x10) bpf$PROG_LOAD(0x5, &(0x7f0000000140)={0x6, 0x1b, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @xdp, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r4 = bpf$MAP_CREATE(0x0, &(0x7f0000000000)=@base={0x19, 0x4, 0x4, 0x2, 0x0, 0x1}, 0x48) bpf$MAP_GET_NEXT_KEY(0x2, &(0x7f0000000240)={r4, &(0x7f0000000280), &(0x7f0000000000)=""/3, 0x2}, 0x20) bpf$MAP_GET_NEXT_KEY(0x2, &(0x7f0000000240)={r4, &(0x7f0000000140), &(0x7f0000000000)=""/6, 0x2}, 0x20) bpf$MAP_DELETE_ELEM(0x3, &(0x7f0000000800)={r4, &(0x7f0000000780)}, 0x20) getsockopt$inet_sctp6_SCTP_MAXSEG(0xffffffffffffffff, 0x84, 0xd, &(0x7f0000000080)=@assoc_value={r3, 0x943}, &(0x7f00000000c0)=0x8) r6 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r6, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe) r7 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) ioctl$sock_bt_hidp_HIDPCONNADD(r7, 0x400448c8, &(0x7f0000000280)={r6, r6, 0xc, 0x1, &(0x7f0000000340)='\x00', 0x9, 0x1, 0x457, 0x9, 0x9, 0x1, 0x1, 'syz1\x00'}) r8 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r8, 0x400448ca, 0x0) syz_mount_image$ext4(&(0x7f0000000040)='ext4\x00', &(0x7f0000000200)='./file1\x00', 0x200000, &(0x7f0000000000)={[{@journal_async_commit}]}, 0x0, 0x57c, &(0x7f0000000380)="$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") getsockopt$inet_sctp6_SCTP_GET_PEER_ADDRS(r1, 0x84, 0x6c, &(0x7f0000000140)={r5, 0x5f, "a5a03c78cd5df4b55bfb5df3cc46868bb333b87b8f9d3494857514cf857108ee9a4b87757f3ffde0ec21a837c231f8e2daebb8627067469474f583dcf30ce072acda1735c5f1db74501c4b8f2aaa74d72ff828d2c65f3c6c5af7615bfb2ba0"}, &(0x7f00000001c0)=0x67) [ 85.568512][ T5300] Bluetooth: hci0: command tx timeout [ 85.708904][ T5315] hid-multitouch 0005:0457:0009.0002: unknown main item tag 0x0 [ 85.742189][ T5315] hid-multitouch 0005:0457:0009.0002: hidraw1: BLUETOOTH HID v0.09 Device [syz1] on aa:aa:aa:aa:aa:aa [ 85.834682][ T5324] loop0: detected capacity change from 0 to 1024 [ 85.845021][ T5323] [ 85.846178][ T5323] ====================================================== [ 85.849222][ T5323] WARNING: possible circular locking dependency detected [ 85.852042][ T5323] syzkaller #0 Not tainted [ 85.854034][ T5323] ------------------------------------------------------ [ 85.857135][ T5323] syz.0.0/5323 is trying to acquire lock: [ 85.859776][ T5323] ffff888011fd5040 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50 [ 85.864807][ T5323] [ 85.864807][ T5323] but task is already holding lock: [ 85.868175][ T5323] ffff888011fd5338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 85.872127][ T5323] [ 85.872127][ T5323] which lock already depends on the new lock. [ 85.872127][ T5323] [ 85.876773][ T5323] [ 85.876773][ T5323] the existing dependency chain (in reverse order) is: [ 85.880602][ T5323] [ 85.880602][ T5323] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 85.883758][ T5323] __mutex_lock+0x19f/0x1300 [ 85.886068][ T5323] l2cap_info_timeout+0x60/0xa0 [ 85.888460][ T5323] process_scheduled_works+0xaec/0x17a0 [ 85.891001][ T5323] worker_thread+0xda6/0x1360 [ 85.893063][ T5323] kthread+0x388/0x470 [ 85.895010][ T5323] ret_from_fork+0x51b/0xa40 [ 85.897285][ T5323] ret_from_fork_asm+0x1a/0x30 [ 85.899536][ T5323] [ 85.899536][ T5323] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 85.903755][ T5323] __lock_acquire+0x15a5/0x2cf0 [ 85.906733][ T5323] lock_acquire+0x106/0x330 [ 85.908813][ T5323] __flush_work+0x700/0xc50 [ 85.911096][ T5323] __cancel_work_sync+0xbe/0x110 [ 85.913383][ T5323] l2cap_conn_del+0x402/0x5b0 [ 85.915620][ T5323] hci_conn_hash_flush+0x10d/0x260 [ 85.918127][ T5323] hci_dev_close_sync+0x821/0x10e0 [ 85.920649][ T5323] hci_dev_close+0x108/0x260 [ 85.922886][ T5323] sock_do_ioctl+0x101/0x320 [ 85.925199][ T5323] sock_ioctl+0x5c6/0x7f0 [ 85.927568][ T5323] __se_sys_ioctl+0xfc/0x170 [ 85.929849][ T5323] do_syscall_64+0xe2/0xf80 [ 85.931990][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.934679][ T5323] [ 85.934679][ T5323] other info that might help us debug this: [ 85.934679][ T5323] [ 85.939044][ T5323] Possible unsafe locking scenario: [ 85.939044][ T5323] [ 85.942259][ T5323] CPU0 CPU1 [ 85.944610][ T5323] ---- ---- [ 85.946418][ T5323] lock(&conn->lock#2); [ 85.948135][ T5323] lock((work_completion)(&(&conn->info_timer)->work)); [ 85.951715][ T5323] lock(&conn->lock#2); [ 85.954216][ T5323] lock((work_completion)(&(&conn->info_timer)->work)); [ 85.956965][ T5323] [ 85.956965][ T5323] *** DEADLOCK *** [ 85.956965][ T5323] [ 85.960171][ T5323] 5 locks held by syz.0.0/5323: [ 85.962244][ T5323] #0: ffff888040e58ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x260 [ 85.966518][ T5323] #1: ffff888040e580c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0 [ 85.971040][ T5323] #2: ffffffff8fd425a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 85.975770][ T5323] #3: ffff888011fd5338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 85.980258][ T5323] #4: ffffffff8e758220 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50 [ 85.984014][ T5323] [ 85.984014][ T5323] stack backtrace: [ 85.986505][ T5323] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 85.986518][ T5323] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 85.986523][ T5323] Call Trace: [ 85.986528][ T5323] [ 85.986558][ T5323] dump_stack_lvl+0xe8/0x150 [ 85.986602][ T5323] print_circular_bug+0x2e1/0x300 [ 85.986617][ T5323] check_noncircular+0x12e/0x150 [ 85.986631][ T5323] __lock_acquire+0x15a5/0x2cf0 [ 85.986651][ T5323] ? do_raw_spin_lock+0x12b/0x2f0 [ 85.986682][ T5323] ? irqentry_exit+0x59c/0x620 [ 85.986698][ T5323] ? lockdep_hardirqs_on+0x7a/0x110 [ 85.986713][ T5323] ? irqentry_exit+0x59c/0x620 [ 85.986730][ T5323] ? __flush_work+0x100/0xc50 [ 85.986743][ T5323] lock_acquire+0x106/0x330 [ 85.986759][ T5323] ? __flush_work+0x100/0xc50 [ 85.986772][ T5323] ? __flush_work+0x100/0xc50 [ 85.986779][ T5323] __flush_work+0x700/0xc50 [ 85.986786][ T5323] ? __flush_work+0x100/0xc50 [ 85.986793][ T5323] ? __flush_work+0x100/0xc50 [ 85.986802][ T5323] ? __pfx___flush_work+0x10/0x10 [ 85.986812][ T5323] ? __pfx_wq_barrier_func+0x10/0x10 [ 85.986831][ T5323] ? __cancel_work_sync+0x5c/0x110 [ 85.986844][ T5323] __cancel_work_sync+0xbe/0x110 [ 85.986856][ T5323] l2cap_conn_del+0x402/0x5b0 [ 85.986874][ T5323] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 85.986889][ T5323] hci_conn_hash_flush+0x10d/0x260 [ 85.986901][ T5323] hci_dev_close_sync+0x821/0x10e0 [ 85.986919][ T5323] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 85.986932][ T5323] ? lockdep_hardirqs_on+0x7a/0x110 [ 85.986946][ T5323] ? enable_work+0x1fd/0x230 [ 85.986959][ T5323] hci_dev_close+0x108/0x260 [ 85.986976][ T5323] sock_do_ioctl+0x101/0x320 [ 85.986991][ T5323] ? __pfx_sock_do_ioctl+0x10/0x10 [ 85.987003][ T5323] ? do_futex+0x395/0x420 [ 85.987043][ T5323] sock_ioctl+0x5c6/0x7f0 [ 85.987057][ T5323] ? __pfx_sock_ioctl+0x10/0x10 [ 85.987070][ T5323] ? __fget_files+0x2a/0x420 [ 85.987082][ T5323] ? __fget_files+0x3a0/0x420 [ 85.987093][ T5323] ? __fget_files+0x2a/0x420 [ 85.987106][ T5323] ? bpf_lsm_file_ioctl+0x9/0x20 [ 85.987139][ T5323] ? __pfx_sock_ioctl+0x10/0x10 [ 85.987186][ T5323] __se_sys_ioctl+0xfc/0x170 [ 85.987206][ T5323] do_syscall_64+0xe2/0xf80 [ 85.987224][ T5323] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.987236][ T5323] ? trace_irq_disable+0x37/0x100 [ 85.987272][ T5323] ? clear_bhb_loop+0x60/0xb0 [ 85.987286][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.987298][ T5323] RIP: 0033:0x7f5695f9bf79 [ 85.987310][ T5323] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 [ 85.987320][ T5323] RSP: 002b:00007f5696eb6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 85.987334][ T5323] RAX: ffffffffffffffda RBX: 00007f5696215fa0 RCX: 00007f5695f9bf79 [ 85.987342][ T5323] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000009 [ 85.987350][ T5323] RBP: 00007f56960327e0 R08: 0000000000000000 R09: 0000000000000000 [ 85.987357][ T5323] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 85.987364][ T5323] R13: 00007f5696216038 R14: 00007f5696215fa0 R15: 00007ffe3a2d14d8 [ 85.987377][ T5323] [ 86.155457][ T5330] fido_id[5330]: Failed to open report descriptor at '/sys/devices/virtual/bluetooth/hci0/hci0:200/report_descriptor': No such file or directory [ 86.243009][ T5324] EXT4-fs (loop0): can't mount with journal_async_commit, fs mounted w/o journal [ 87.589364][ T4667] Bluetooth: hci0: command tx timeout [ 89.669691][ T4667] Bluetooth: hci0: command tx timeout [ 91.749795][ T4667] Bluetooth: hci0: command tx timeout [ 91.754581][ T55] cfg80211: failed to load regulatory.db