program: r0 = socket$inet6_udp(0xa, 0x2, 0x0) mmap(&(0x7f0000001000/0x2000)=nil, 0x2000, 0x300000a, 0x12, r0, 0x852ac000) (async) syz_mount_image$btrfs(&(0x7f0000005100), &(0x7f0000000040)='./file1\x00', 0x800810, &(0x7f00000001c0), 0xfb, 0x50f9, 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qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqwg4cCAAAAAAA+b82QlVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV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(async) r1 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./file1\x00', 0x0, 0x0) r2 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000540), 0x44800, 0x0) sendfile(r1, r2, 0x0, 0xfffe82) (async) getsockopt$netrom_NETROM_IDLE(r1, 0x103, 0x7, &(0x7f0000000140)=0x81, &(0x7f0000000200)=0x4) (async) r3 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r3, 0x400448ca, 0x0) (async) r4 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) write$bt_hci(r1, &(0x7f0000000240)=ANY=[@ANYBLOB="01936a0100"], 0x5) (async) setsockopt$TIPC_GROUP_LEAVE(r1, 0x10f, 0x88) (async) ioctl$sock_bt_hci(r4, 0x400448c9, 0x0) (async) syz_emit_vhci(&(0x7f0000000040)=ANY=[@ANYBLOB="040e0402030c"], 0x7) syz_usb_connect(0x0, 0x3d, 0x0, 0x0) (async) ioctl$BTRFS_IOC_ENCODED_READ(r1, 0x80809440, &(0x7f00000004c0)={&(0x7f0000000100)=[{&(0x7f0000000340)="0b481c06c3318a4a5198c685cffa00000000000400000000", 0xfffffdd0}], 0x1, 0x0, 0x0, 0x1003, 0x20000950, 0xed, 0x1, 0x4}) (async) socket$nl_netfilter(0x10, 0x3, 0xc) (async) r5 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r5, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe) (async) syz_emit_vhci(&(0x7f0000000280)=ANY=[@ANYBLOB="02c8cf3d8d5585bd200c0008000100218853021807380500ffff0200"], 0x11) sendmsg$IPSET_CMD_CREATE(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000000)={&(0x7f0000000380)={0x4c, 0x2, 0x6, 0x201, 0x0, 0x0, {}, [@IPSET_ATTR_REVISION={0x5}, @IPSET_ATTR_TYPENAME={0xd, 0x3, 'hash:net\x00'}, @IPSET_ATTR_PROTOCOL={0x5, 0x1, 0x6}, @IPSET_ATTR_DATA={0xc, 0x7, 0x0, 0x1, [@IPSET_ATTR_MAXELEM={0x8}]}, @IPSET_ATTR_FAMILY={0x5, 0x5, 0xa}, @IPSET_ATTR_DATA={0x4}]}, 0x4c}}, 0x0) (async) mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0xf, 0x4008032, 0xffffffffffffffff, 0x0) madvise(&(0x7f0000000000/0xc00000)=nil, 0xc00000, 0x19) (async) r6 = socket$alg(0x26, 0x5, 0x0) bind$alg(r6, &(0x7f0000000080)={0x26, 'skcipher\x00', 0x0, 0x0, 'pcbc(fcrypt)\x00'}, 0x58) (async) setsockopt$ALG_SET_KEY(r6, 0x117, 0x1, &(0x7f0000000040)="415b7ac700000000", 0x8) (async) r7 = accept(r6, 0x0, 0x0) sendmmsg$alg(r7, &(0x7f0000000740)=[{0x0, 0x0, &(0x7f0000000100)=[{&(0x7f0000000500)="564004c6852da7a2", 0x8}, {&(0x7f0000000780)="44855e4d16c8e81cc3f8402d02b486c0bad909df40571a0bd1370e0c1d8f88973d7ae2604da904e571c018f13ed415601c843cfe4bb8021f90d6c0d887ec6adeee956885201a0be3aaa73f854ea12d2fc7772e0e5afda7e5f9576bc09540c1284bfaa62ef31f4f656091afd9363e2a345048b9b7af1161258e177e02ce3bc49d466dd9f162fed96d490fd65595096d1a796934a3d7d3f799304779b90a67", 0x9e}], 0x2}], 0x1, 0x0) (async) recvmsg(r7, &(0x7f000000b680)={0x0, 0x0, &(0x7f000000b600)=[{&(0x7f0000000000)=""/12, 0xc}, {&(0x7f000000b500)=""/153, 0x99}], 0x2}, 0x0) (async) madvise(&(0x7f0000000000/0x600000)=nil, 0x600722, 0x66) [ 103.508280][ T5304] Bluetooth: hci0: command tx timeout [ 103.524835][ T10] [ 103.525968][ T10] ====================================================== [ 103.530192][ T10] WARNING: possible circular locking dependency detected [ 103.533967][ T10] syzkaller #0 Not tainted [ 103.536109][ T10] ------------------------------------------------------ [ 103.539404][ T10] kworker/0:1/10 is trying to acquire lock: [ 103.545474][ T10] ffff88803fc5aaf8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_info_timeout+0x60/0xa0 [ 103.550861][ T10] [ 103.550861][ T10] but task is already holding lock: [ 103.554425][ T10] ffffc9000023fc40 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 [ 103.560447][ T10] [ 103.560447][ T10] which lock already depends on the new lock. [ 103.560447][ T10] [ 103.565283][ T10] [ 103.565283][ T10] the existing dependency chain (in reverse order) is: [ 103.570027][ T10] [ 103.570027][ T10] -> #1 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 103.576234][ T10] __flush_work+0x700/0xc50 [ 103.578605][ T10] __cancel_work_sync+0xbe/0x110 [ 103.581178][ T10] l2cap_conn_del+0x40f/0x5c0 [ 103.583471][ T10] hci_conn_hash_flush+0x10d/0x260 [ 103.586009][ T10] hci_dev_close_sync+0x821/0x10e0 [ 103.589118][ T10] hci_dev_close+0x108/0x260 [ 103.591908][ T10] sock_do_ioctl+0x101/0x320 [ 103.594266][ T10] sock_ioctl+0x5c6/0x7f0 [ 103.596358][ T10] __se_sys_ioctl+0xfc/0x170 [ 103.598676][ T10] do_syscall_64+0x14d/0xf80 [ 103.601164][ T10] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 103.604530][ T10] [ 103.604530][ T10] -> #0 (&conn->lock#2){+.+.}-{4:4}: [ 103.607951][ T10] __lock_acquire+0x15a5/0x2cf0 [ 103.610361][ T10] lock_acquire+0xf0/0x2e0 [ 103.612954][ T10] __mutex_lock+0x19f/0x1300 [ 103.616075][ T10] l2cap_info_timeout+0x60/0xa0 [ 103.618850][ T10] process_scheduled_works+0xb6e/0x18c0 [ 103.621514][ T10] worker_thread+0xa53/0xfc0 [ 103.623732][ T10] kthread+0x388/0x470 [ 103.625963][ T10] ret_from_fork+0x51e/0xb90 [ 103.628775][ T10] ret_from_fork_asm+0x1a/0x30 [ 103.631492][ T10] [ 103.631492][ T10] other info that might help us debug this: [ 103.631492][ T10] [ 103.636308][ T10] Possible unsafe locking scenario: [ 103.636308][ T10] [ 103.639519][ T10] CPU0 CPU1 [ 103.642066][ T10] ---- ---- [ 103.645239][ T10] lock((work_completion)(&(&conn->info_timer)->work)); [ 103.649586][ T10] lock(&conn->lock#2); [ 103.652706][ T10] lock((work_completion)(&(&conn->info_timer)->work)); [ 103.656770][ T10] lock(&conn->lock#2); [ 103.658901][ T10] [ 103.658901][ T10] *** DEADLOCK *** [ 103.658901][ T10] [ 103.663411][ T10] 2 locks held by kworker/0:1/10: [ 103.666172][ T10] #0: ffff88801aca6948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 [ 103.671590][ T10] #1: ffffc9000023fc40 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 [ 103.677136][ T10] [ 103.677136][ T10] stack backtrace: [ 103.679990][ T10] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) [ 103.680014][ T10] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 103.680024][ T10] Workqueue: events l2cap_info_timeout [ 103.680054][ T10] Call Trace: [ 103.680071][ T10] [ 103.680079][ T10] dump_stack_lvl+0xe8/0x150 [ 103.680102][ T10] print_circular_bug+0x2e1/0x300 [ 103.680124][ T10] check_noncircular+0x12e/0x150 [ 103.680143][ T10] __lock_acquire+0x15a5/0x2cf0 [ 103.680158][ T10] ? __schedule+0x15f3/0x52d0 [ 103.680172][ T10] ? ret_from_fork_asm+0x1a/0x30 [ 103.680192][ T10] lock_acquire+0xf0/0x2e0 [ 103.680207][ T10] ? l2cap_info_timeout+0x60/0xa0 [ 103.680225][ T10] __mutex_lock+0x19f/0x1300 [ 103.680235][ T10] ? l2cap_info_timeout+0x60/0xa0 [ 103.680247][ T10] ? irqentry_exit+0x59e/0x620 [ 103.680260][ T10] ? lockdep_hardirqs_on+0x7a/0x110 [ 103.680270][ T10] ? l2cap_info_timeout+0x60/0xa0 [ 103.680284][ T10] ? irqentry_exit+0x59e/0x620 [ 103.680296][ T10] ? trace_irq_disable+0x3b/0x150 [ 103.680338][ T10] ? __pfx___mutex_lock+0x10/0x10 [ 103.680355][ T10] ? lock_acquire+0x20b/0x2e0 [ 103.680372][ T10] l2cap_info_timeout+0x60/0xa0 [ 103.680388][ T10] ? process_scheduled_works+0xa8d/0x18c0 [ 103.680405][ T10] process_scheduled_works+0xb6e/0x18c0 [ 103.680431][ T10] ? __pfx_process_scheduled_works+0x10/0x10 [ 103.680450][ T10] ? assign_work+0x3d5/0x5e0 [ 103.680467][ T10] worker_thread+0xa53/0xfc0 [ 103.680494][ T10] kthread+0x388/0x470 [ 103.680507][ T10] ? __pfx_worker_thread+0x10/0x10 [ 103.680523][ T10] ? __pfx_kthread+0x10/0x10 [ 103.680537][ T10] ret_from_fork+0x51e/0xb90 [ 103.680558][ T10] ? __pfx_ret_from_fork+0x10/0x10 [ 103.680579][ T10] ? __switch_to+0xc7d/0x1450 [ 103.680639][ T10] ? __pfx_kthread+0x10/0x10 [ 103.680653][ T10] ret_from_fork_asm+0x1a/0x30 [ 103.680675][ T10] [ 105.539068][ T5304] Bluetooth: hci0: command tx timeout [ 107.619195][ T5304] Bluetooth: hci0: command tx timeout