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mknodat(0xffffffffffffff9c, &(0x7f0000000040)='./file7\x00', 0x21c0, 0x103) r0 = openat$sysctl(0xffffffffffffff9c, &(0x7f0000000040)='/proc/sys/vm/drop_caches\x00', 0x1, 0x0) writev(r0, &(0x7f00000000c0)=[{&(0x7f0000000140)='2', 0x1}], 0x1) mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0xb635773f06ebbeee, 0x8031, 0xffffffffffffffff, 0x0) renameat2(0xffffffffffffff9c, &(0x7f0000000580)='./file1\x00', 0xffffffffffffff9c, &(0x7f00000005c0)='./file7\x00', 0x0) r1 = openat$bsg(0xffffffffffffff9c, &(0x7f0000000180)='/dev/bsg/0:0:0:0\x00', 0x40101, 0x0) r2 = syz_init_net_socket$bt_l2cap(0x1f, 0x3, 0x0) connect$bt_l2cap(r2, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x803}, 0xe) syz_emit_vhci(&(0x7f0000000340)=ANY=[@ANYBLOB="02c82028002400010007d3040007c4faff020c04000300d3"], 0x2d) r3 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$HCIINQUIRY(r3, 0x400448ca, 0x0) ioctl$SG_GET_REQUEST_TABLE(r1, 0x2286, &(0x7f00000001c0)) [ 75.231743][ T5320] Bluetooth: hci0: command tx timeout [ 75.563219][ T5341] loop0: detected capacity change from 0 to 32768 [ 75.594315][ T5341] BTRFS: device fsid ed167579-eb65-4e76-9a50-61ac97e9b59d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5341) [ 75.635721][ T5341] BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d [ 75.640363][ T5341] BTRFS info (device loop0): using sha256 (sha256-lib) checksum algorithm [ 75.830183][ T5341] BTRFS info (device loop0): rebuilding free space tree [ 75.879007][ T5341] BTRFS info (device loop0): disabling free space tree [ 75.885377][ T5341] BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1) [ 75.889707][ T5341] BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2) [ 75.916985][ T5341] BTRFS info (device loop0): setting nodatasum [ 75.919922][ T5341] BTRFS info (device loop0): setting nodatacow [ 75.935161][ T5341] BTRFS info (device loop0): turning off barriers [ 75.937972][ T5341] BTRFS info (device loop0): turning on sync discard [ 75.940866][ T5341] BTRFS info (device loop0): force clearing of disk cache [ 76.332511][ T1314] ieee802154 phy0 wpan0: encryption failed: -22 [ 76.335534][ T1314] ieee802154 phy1 wpan1: encryption failed: -22 [ 76.643416][ T5342] [ 76.644584][ T5342] ====================================================== [ 76.647485][ T5342] WARNING: possible circular locking dependency detected [ 76.650418][ T5342] syzkaller #0 Not tainted [ 76.652323][ T5342] ------------------------------------------------------ [ 76.655403][ T5342] syz.0.0/5342 is trying to acquire lock: [ 76.657869][ T5342] ffff8880110cc840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 76.662670][ T5342] [ 76.662670][ T5342] but task is already holding lock: [ 76.666033][ T5342] ffff8880110ccb38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 76.669681][ T5342] [ 76.669681][ T5342] which lock already depends on the new lock. [ 76.669681][ T5342] [ 76.673886][ T5342] [ 76.673886][ T5342] the existing dependency chain (in reverse order) is: [ 76.677951][ T5342] [ 76.677951][ T5342] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 76.681292][ T5342] __mutex_lock+0x187/0x1350 [ 76.683719][ T5342] l2cap_info_timeout+0x60/0xa0 [ 76.686051][ T5342] process_scheduled_works+0xad1/0x1770 [ 76.688711][ T5342] worker_thread+0x8a0/0xda0 [ 76.690961][ T5342] kthread+0x711/0x8a0 [ 76.692842][ T5342] ret_from_fork+0x510/0xa50 [ 76.695265][ T5342] ret_from_fork_asm+0x1a/0x30 [ 76.697621][ T5342] [ 76.697621][ T5342] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 76.702245][ T5342] __lock_acquire+0x15a6/0x2cf0 [ 76.704848][ T5342] lock_acquire+0x107/0x340 [ 76.707222][ T5342] __flush_work+0x6b8/0xbc0 [ 76.709439][ T5342] __cancel_work_sync+0xbe/0x110 [ 76.711792][ T5342] l2cap_conn_del+0x402/0x5b0 [ 76.714113][ T5342] hci_conn_hash_flush+0x10d/0x260 [ 76.716695][ T5342] hci_dev_close_sync+0x821/0x1100 [ 76.719392][ T5342] hci_dev_close+0x108/0x270 [ 76.721674][ T5342] sock_do_ioctl+0xdc/0x300 [ 76.723878][ T5342] sock_ioctl+0x576/0x790 [ 76.726110][ T5342] __se_sys_ioctl+0xfc/0x170 [ 76.728420][ T5342] do_syscall_64+0xec/0xf80 [ 76.730691][ T5342] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.733294][ T5342] [ 76.733294][ T5342] other info that might help us debug this: [ 76.733294][ T5342] [ 76.737716][ T5342] Possible unsafe locking scenario: [ 76.737716][ T5342] [ 76.741853][ T5342] CPU0 CPU1 [ 76.744172][ T5342] ---- ---- [ 76.746424][ T5342] lock(&conn->lock#2); [ 76.748191][ T5342] lock((work_completion)(&(&conn->info_timer)->work)); [ 76.752090][ T5342] lock(&conn->lock#2); [ 76.755247][ T5342] lock((work_completion)(&(&conn->info_timer)->work)); [ 76.758412][ T5342] [ 76.758412][ T5342] *** DEADLOCK *** [ 76.758412][ T5342] [ 76.762006][ T5342] 5 locks held by syz.0.0/5342: [ 76.764220][ T5342] #0: ffff88803fd48ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x270 [ 76.768434][ T5342] #1: ffff88803fd480c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x1100 [ 76.772489][ T5342] #2: ffffffff8f485a08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 76.776920][ T5342] #3: ffff8880110ccb38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 76.780942][ T5342] #4: ffffffff8df41aa0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 76.784845][ T5342] [ 76.784845][ T5342] stack backtrace: [ 76.787525][ T5342] CPU: 0 UID: 0 PID: 5342 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 76.787542][ T5342] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 76.787550][ T5342] Call Trace: [ 76.787557][ T5342] [ 76.787564][ T5342] dump_stack_lvl+0xe8/0x150 [ 76.787583][ T5342] print_circular_bug+0x2e2/0x300 [ 76.787596][ T5342] check_noncircular+0x12e/0x150 [ 76.787610][ T5342] __lock_acquire+0x15a6/0x2cf0 [ 76.787623][ T5342] ? do_raw_spin_lock+0x121/0x290 [ 76.787638][ T5342] ? __flush_work+0xd2/0xbc0 [ 76.787649][ T5342] lock_acquire+0x107/0x340 [ 76.787659][ T5342] ? __flush_work+0xd2/0xbc0 [ 76.787671][ T5342] ? __flush_work+0xd2/0xbc0 [ 76.787683][ T5342] __flush_work+0x6b8/0xbc0 [ 76.787693][ T5342] ? __flush_work+0xd2/0xbc0 [ 76.787704][ T5342] ? __flush_work+0xd2/0xbc0 [ 76.787716][ T5342] ? __pfx___flush_work+0x10/0x10 [ 76.787728][ T5342] ? __pfx_wq_barrier_func+0x10/0x10 [ 76.787742][ T5342] ? __cancel_work_sync+0x5c/0x110 [ 76.787754][ T5342] __cancel_work_sync+0xbe/0x110 [ 76.787766][ T5342] l2cap_conn_del+0x402/0x5b0 [ 76.787782][ T5342] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 76.787797][ T5342] hci_conn_hash_flush+0x10d/0x260 [ 76.787815][ T5342] hci_dev_close_sync+0x821/0x1100 [ 76.787829][ T5342] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 76.787842][ T5342] ? lockdep_hardirqs_on+0x7b/0x110 [ 76.787852][ T5342] ? enable_work+0x1e9/0x220 [ 76.787865][ T5342] hci_dev_close+0x108/0x270 [ 76.787879][ T5342] sock_do_ioctl+0xdc/0x300 [ 76.787892][ T5342] ? __pfx_sock_do_ioctl+0x10/0x10 [ 76.787905][ T5342] ? do_futex+0x395/0x420 [ 76.787915][ T5342] ? call_rcu+0x644/0x890 [ 76.787928][ T5342] sock_ioctl+0x576/0x790 [ 76.787938][ T5342] ? __pfx_sock_ioctl+0x10/0x10 [ 76.787951][ T5342] ? __fget_files+0x2a/0x420 [ 76.787962][ T5342] ? __fget_files+0x3a0/0x420 [ 76.787973][ T5342] ? __fget_files+0x2a/0x420 [ 76.787986][ T5342] ? bpf_lsm_file_ioctl+0x9/0x20 [ 76.787996][ T5342] ? __pfx_sock_ioctl+0x10/0x10 [ 76.788006][ T5342] __se_sys_ioctl+0xfc/0x170 [ 76.788018][ T5342] do_syscall_64+0xec/0xf80 [ 76.788027][ T5342] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.788036][ T5342] ? trace_irq_disable+0x37/0x100 [ 76.788050][ T5342] ? clear_bhb_loop+0x60/0xb0 [ 76.788061][ T5342] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.788072][ T5342] RIP: 0033:0x7fea37f8f7c9 [ 76.788084][ T5342] 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 a8 ff ff ff f7 d8 64 89 01 48 [ 76.788094][ T5342] RSP: 002b:00007fea38e75038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 76.788105][ T5342] RAX: ffffffffffffffda RBX: 00007fea381e6090 RCX: 00007fea37f8f7c9 [ 76.788112][ T5342] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000008 [ 76.788118][ T5342] RBP: 00007fea38013f91 R08: 0000000000000000 R09: 0000000000000000 [ 76.788124][ T5342] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 76.788130][ T5342] R13: 00007fea381e6128 R14: 00007fea381e6090 R15: 00007ffd35da7f88 [ 76.788141][ T5342] [ 77.121954][ T5341] syz.0.0 (5341): drop_caches: 2 [ 77.281299][ T46] Bluetooth: hci0: command tx timeout [ 79.361941][ T46] Bluetooth: hci0: command tx timeout [ 81.441290][ T46] Bluetooth: hci0: command tx timeout