Extracting prog: 1m8.501207051s Minimizing prog: 3m10.399229639s Simplifying prog options: 0s Extracting C: 25.737890952s Simplifying C: 7m55.027538624s 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:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program crashed: possible deadlock in l2cap_chan_connect single: successfully extracted reproducer found reproducer with 3 syscalls minimizing guilty program testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) connect$bt_rfcomm(0xffffffffffffffff, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(0x0, 0x0) r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, 0x0, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect simplifying C reproducer testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program did not crash testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program did not crash testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:false Swap:true UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm program crashed: possible deadlock in l2cap_chan_connect testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program did not crash validation run: crashed=false testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program crashed: possible deadlock in l2cap_chan_connect validation run: crashed=true testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program crashed: possible deadlock in l2cap_chan_connect validation run: crashed=true testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_emit_vhci-syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm detailed listing: executing program 0: syz_emit_vhci(&(0x7f0000001a40)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x0, 0xc9}}}, 0x6) r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f00000003c0)={0x1f, @none, 0x8}, 0xa) program crashed: possible deadlock in l2cap_chan_connect validation run: crashed=true reproducing took 15m3.838034428s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.17/5920 is trying to acquire lock: ffff8880366740b8 (&hdev->lock){+.+.}-{4:4}, at: l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7281 but task is already holding lock: ffffffff90f82800 (rfcomm_mutex){+.+.}-{4:4}, at: rfcomm_dlc_open+0x92/0xac0 net/bluetooth/rfcomm/core.c:426 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (rfcomm_mutex){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2222 hci_auth_cfm include/net/bluetooth/hci_core.h:2202 [inline] hci_auth_complete_evt+0x811/0x1180 net/bluetooth/hci_event.c:3554 hci_event_func net/bluetooth/hci_event.c:7887 [inline] hci_event_packet+0x8e9/0xcd0 net/bluetooth/hci_event.c:7938 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4053 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (hci_cb_list_lock){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 hci_connect_cfm include/net/bluetooth/hci_core.h:2163 [inline] hci_remote_features_evt+0x485/0x9b0 net/bluetooth/hci_event.c:3786 hci_event_func net/bluetooth/hci_event.c:7887 [inline] hci_event_packet+0x8e9/0xcd0 net/bluetooth/hci_event.c:7938 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4053 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #0 (&hdev->lock){+.+.}-{4:4}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7281 l2cap_sock_connect+0x37a/0x770 net/bluetooth/l2cap_sock.c:255 kernel_connect+0x107/0x160 net/socket.c:3755 rfcomm_session_create net/bluetooth/rfcomm/core.c:808 [inline] __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:385 [inline] rfcomm_dlc_open+0x838/0xac0 net/bluetooth/rfcomm/core.c:428 rfcomm_sock_connect+0x42c/0x690 net/bluetooth/rfcomm/sock.c:419 connect_socket net/socket.c:2141 [inline] connect_socket net/socket.c:2131 [inline] __sys_connect_file+0x146/0x1a0 net/socket.c:2166 __sys_connect+0x141/0x170 net/socket.c:2183 __do_sys_connect net/socket.c:2189 [inline] __se_sys_connect net/socket.c:2186 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2186 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &hdev->lock --> hci_cb_list_lock --> rfcomm_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rfcomm_mutex); lock(hci_cb_list_lock); lock(rfcomm_mutex); lock(&hdev->lock); *** DEADLOCK *** locks held by syz.0.17/5920: 1, last CPU#1: #0: ffffffff90f82800 (rfcomm_mutex){+.+.}-{4:4}, at: rfcomm_dlc_open+0x92/0xac0 net/bluetooth/rfcomm/core.c:426 stack backtrace: CPU: 1 UID: 0 PID: 5920 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2087 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2219 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7281 l2cap_sock_connect+0x37a/0x770 net/bluetooth/l2cap_sock.c:255 kernel_connect+0x107/0x160 net/socket.c:3755 rfcomm_session_create net/bluetooth/rfcomm/core.c:808 [inline] __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:385 [inline] rfcomm_dlc_open+0x838/0xac0 net/bluetooth/rfcomm/core.c:428 rfcomm_sock_connect+0x42c/0x690 net/bluetooth/rfcomm/sock.c:419 connect_socket net/socket.c:2141 [inline] connect_socket net/socket.c:2131 [inline] __sys_connect_file+0x146/0x1a0 net/socket.c:2166 __sys_connect+0x141/0x170 net/socket.c:2183 __do_sys_connect net/socket.c:2189 [inline] __se_sys_connect net/socket.c:2186 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2186 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb857d9e159 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 RSP: 002b:00007ffc289ba9f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fb858025fa0 RCX: 00007fb857d9e159 RDX: 000000000000000a RSI: 00002000000003c0 RDI: 0000000000000004 RBP: 00007fb857e3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb858025fac R14: 00007fb858025fa0 R15: 00007fb858025fa0 final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.17/5920 is trying to acquire lock: ffff8880366740b8 (&hdev->lock){+.+.}-{4:4}, at: l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7281 but task is already holding lock: ffffffff90f82800 (rfcomm_mutex){+.+.}-{4:4}, at: rfcomm_dlc_open+0x92/0xac0 net/bluetooth/rfcomm/core.c:426 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (rfcomm_mutex){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2222 hci_auth_cfm include/net/bluetooth/hci_core.h:2202 [inline] hci_auth_complete_evt+0x811/0x1180 net/bluetooth/hci_event.c:3554 hci_event_func net/bluetooth/hci_event.c:7887 [inline] hci_event_packet+0x8e9/0xcd0 net/bluetooth/hci_event.c:7938 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4053 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (hci_cb_list_lock){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 hci_connect_cfm include/net/bluetooth/hci_core.h:2163 [inline] hci_remote_features_evt+0x485/0x9b0 net/bluetooth/hci_event.c:3786 hci_event_func net/bluetooth/hci_event.c:7887 [inline] hci_event_packet+0x8e9/0xcd0 net/bluetooth/hci_event.c:7938 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4053 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #0 (&hdev->lock){+.+.}-{4:4}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7281 l2cap_sock_connect+0x37a/0x770 net/bluetooth/l2cap_sock.c:255 kernel_connect+0x107/0x160 net/socket.c:3755 rfcomm_session_create net/bluetooth/rfcomm/core.c:808 [inline] __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:385 [inline] rfcomm_dlc_open+0x838/0xac0 net/bluetooth/rfcomm/core.c:428 rfcomm_sock_connect+0x42c/0x690 net/bluetooth/rfcomm/sock.c:419 connect_socket net/socket.c:2141 [inline] connect_socket net/socket.c:2131 [inline] __sys_connect_file+0x146/0x1a0 net/socket.c:2166 __sys_connect+0x141/0x170 net/socket.c:2183 __do_sys_connect net/socket.c:2189 [inline] __se_sys_connect net/socket.c:2186 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2186 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &hdev->lock --> hci_cb_list_lock --> rfcomm_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rfcomm_mutex); lock(hci_cb_list_lock); lock(rfcomm_mutex); lock(&hdev->lock); *** DEADLOCK *** locks held by syz.0.17/5920: 1, last CPU#1: #0: ffffffff90f82800 (rfcomm_mutex){+.+.}-{4:4}, at: rfcomm_dlc_open+0x92/0xac0 net/bluetooth/rfcomm/core.c:426 stack backtrace: CPU: 1 UID: 0 PID: 5920 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2087 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2219 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7281 l2cap_sock_connect+0x37a/0x770 net/bluetooth/l2cap_sock.c:255 kernel_connect+0x107/0x160 net/socket.c:3755 rfcomm_session_create net/bluetooth/rfcomm/core.c:808 [inline] __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:385 [inline] rfcomm_dlc_open+0x838/0xac0 net/bluetooth/rfcomm/core.c:428 rfcomm_sock_connect+0x42c/0x690 net/bluetooth/rfcomm/sock.c:419 connect_socket net/socket.c:2141 [inline] connect_socket net/socket.c:2131 [inline] __sys_connect_file+0x146/0x1a0 net/socket.c:2166 __sys_connect+0x141/0x170 net/socket.c:2183 __do_sys_connect net/socket.c:2189 [inline] __se_sys_connect net/socket.c:2186 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2186 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb857d9e159 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 RSP: 002b:00007ffc289ba9f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fb858025fa0 RCX: 00007fb857d9e159 RDX: 000000000000000a RSI: 00002000000003c0 RDI: 0000000000000004 RBP: 00007fb857e3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb858025fac R14: 00007fb858025fa0 R15: 00007fb858025fa0