Extracting prog: 3m25.770060515s Minimizing prog: 35m19.534403589s Simplifying prog options: 12m32.70878623s Extracting C: 5m17.385160509s Simplifying C: 0s 1 programs, timeouts [30s 6m0s] extracting reproducer from 1 programs testing a last program of every proc single: executing 1 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco-setsockopt$bt_BT_VOICE detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) setsockopt$bt_BT_VOICE(r0, 0x112, 0xb, &(0x7f0000000080)=0x30, 0x2) program did not crash single: failed to extract reproducer single: executing 1 programs separately with timeout 6m0s testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco-setsockopt$bt_BT_VOICE detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) setsockopt$bt_BT_VOICE(r0, 0x112, 0xb, &(0x7f0000000080)=0x30, 0x2) program crashed: possible deadlock in sco_conn_del single: successfully extracted reproducer found reproducer with 4 syscalls minimizing guilty program testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) program crashed: possible deadlock in sco_conn_del testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): connect$bt_sco-connect$bt_sco detailed listing: executing program 0: connect$bt_sco(0xffffffffffffffff, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) connect$bt_sco(0xffffffffffffffff, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) program crashed: lost connection to test machine suppressed program crash: lost connection to test machine testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, 0x0, 0x0) (async) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) connect$bt_sco(r0, 0x0, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco program crashed: no output from test machine a never seen crash title: no output from test machine, ignore simplifying guilty program options testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) program crashed: possible deadlock in sco_conn_del extracting C reproducer testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco program crashed: no output from test machine a never seen crash title: no output from test machine, ignore testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_sco-connect$bt_sco-connect$bt_sco detailed listing: executing program 0: r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2) connect$bt_sco(r0, &(0x7f0000000000)={0x1f, @none}, 0x8) (async) connect$bt_sco(r0, &(0x7f0000000040)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8) program did not crash reproducing took 56m28.980181918s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected 5.15.168-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/3690 is trying to acquire lock: ffff88807806d120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1678 [inline] ffff88807806d120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0x104/0x300 net/bluetooth/sco.c:200 but task is already holding lock: ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1517 [inline] ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x220 net/bluetooth/hci_conn.c:1622 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (hci_cb_list_lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 hci_connect_cfm include/net/bluetooth/hci_core.h:1502 [inline] hci_remote_features_evt+0x52f/0xb50 net/bluetooth/hci_event.c:3352 hci_event_packet+0x6fe/0x1550 net/bluetooth/hci_event.c:6421 hci_rx_work+0x232/0x990 net/bluetooth/hci_core.c:5155 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #1 (&hdev->lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 sco_sock_connect+0x181/0x8e0 net/bluetooth/sco.c:591 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x38b/0x410 net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1947 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 lock_sock_nested+0x44/0x100 net/core/sock.c:3250 lock_sock include/net/sock.h:1678 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:200 hci_disconn_cfm include/net/bluetooth/hci_core.h:1520 [inline] hci_conn_hash_flush+0x10d/0x220 net/bluetooth/hci_conn.c:1622 hci_dev_do_close+0x9f6/0x1070 net/bluetooth/hci_core.c:1795 hci_unregister_dev+0x2d7/0x580 net/bluetooth/hci_core.c:4040 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:345 __fput+0x3fe/0x8e0 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:874 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: sk_lock-AF_BLUETOOTH-BTPROTO_SCO --> &hdev->lock --> hci_cb_list_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hci_cb_list_lock); lock(&hdev->lock); lock(hci_cb_list_lock); lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO); *** DEADLOCK *** 3 locks held by syz-executor/3690: #0: ffff88807df5cff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x63/0x1070 net/bluetooth/hci_core.c:1737 #1: ffff88807df5c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x431/0x1070 net/bluetooth/hci_core.c:1782 #2: ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1517 [inline] #2: ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x220 net/bluetooth/hci_conn.c:1622 stack backtrace: CPU: 0 PID: 3690 Comm: syz-executor Not tainted 5.15.168-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 lock_sock_nested+0x44/0x100 net/core/sock.c:3250 lock_sock include/net/sock.h:1678 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:200 hci_disconn_cfm include/net/bluetooth/hci_core.h:1520 [inline] hci_conn_hash_flush+0x10d/0x220 net/bluetooth/hci_conn.c:1622 hci_dev_do_close+0x9f6/0x1070 net/bluetooth/hci_core.c:1795 hci_unregister_dev+0x2d7/0x580 net/bluetooth/hci_core.c:4040 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:345 __fput+0x3fe/0x8e0 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:874 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5c21ed8adf Code: Unable to access opcode bytes at RIP 0x7f5c21ed8ab5. RSP: 002b:00007ffda7bfd3e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: 0000000000000004 RBX: 000000000000025a RCX: 00007f5c21ed8adf RDX: 0000000000000004 RSI: 00007ffda7bfd490 RDI: 00000000000000f8 RBP: 00007ffda7bfd43c R08: 0000000000000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 000000000002a94a R14: 000000000002a94a R15: 00007ffda7bfd490 final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected 5.15.168-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/3690 is trying to acquire lock: ffff88807806d120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1678 [inline] ffff88807806d120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0x104/0x300 net/bluetooth/sco.c:200 but task is already holding lock: ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1517 [inline] ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x220 net/bluetooth/hci_conn.c:1622 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (hci_cb_list_lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 hci_connect_cfm include/net/bluetooth/hci_core.h:1502 [inline] hci_remote_features_evt+0x52f/0xb50 net/bluetooth/hci_event.c:3352 hci_event_packet+0x6fe/0x1550 net/bluetooth/hci_event.c:6421 hci_rx_work+0x232/0x990 net/bluetooth/hci_core.c:5155 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #1 (&hdev->lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 sco_sock_connect+0x181/0x8e0 net/bluetooth/sco.c:591 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x38b/0x410 net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1947 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 lock_sock_nested+0x44/0x100 net/core/sock.c:3250 lock_sock include/net/sock.h:1678 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:200 hci_disconn_cfm include/net/bluetooth/hci_core.h:1520 [inline] hci_conn_hash_flush+0x10d/0x220 net/bluetooth/hci_conn.c:1622 hci_dev_do_close+0x9f6/0x1070 net/bluetooth/hci_core.c:1795 hci_unregister_dev+0x2d7/0x580 net/bluetooth/hci_core.c:4040 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:345 __fput+0x3fe/0x8e0 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:874 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: sk_lock-AF_BLUETOOTH-BTPROTO_SCO --> &hdev->lock --> hci_cb_list_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hci_cb_list_lock); lock(&hdev->lock); lock(hci_cb_list_lock); lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO); *** DEADLOCK *** 3 locks held by syz-executor/3690: #0: ffff88807df5cff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x63/0x1070 net/bluetooth/hci_core.c:1737 #1: ffff88807df5c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x431/0x1070 net/bluetooth/hci_core.c:1782 #2: ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1517 [inline] #2: ffffffff8db7b528 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x220 net/bluetooth/hci_conn.c:1622 stack backtrace: CPU: 0 PID: 3690 Comm: syz-executor Not tainted 5.15.168-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 lock_sock_nested+0x44/0x100 net/core/sock.c:3250 lock_sock include/net/sock.h:1678 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:200 hci_disconn_cfm include/net/bluetooth/hci_core.h:1520 [inline] hci_conn_hash_flush+0x10d/0x220 net/bluetooth/hci_conn.c:1622 hci_dev_do_close+0x9f6/0x1070 net/bluetooth/hci_core.c:1795 hci_unregister_dev+0x2d7/0x580 net/bluetooth/hci_core.c:4040 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:345 __fput+0x3fe/0x8e0 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:874 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5c21ed8adf Code: Unable to access opcode bytes at RIP 0x7f5c21ed8ab5. RSP: 002b:00007ffda7bfd3e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: 0000000000000004 RBX: 000000000000025a RCX: 00007f5c21ed8adf RDX: 0000000000000004 RSI: 00007ffda7bfd490 RDI: 00000000000000f8 RBP: 00007ffda7bfd43c R08: 0000000000000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 000000000002a94a R14: 000000000002a94a R15: 00007ffda7bfd490