Extracting prog: 1m6.983212268s Minimizing prog: 3m2.836169581s Simplifying prog options: 0s Extracting C: 20.553601385s Simplifying C: 8m6.77401798s 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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci detailed listing: executing program 0: r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f0000005dc0)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x15}, 0xa) syz_emit_vhci(&(0x7f0000003980)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x6, 0xc8}}}, 0x6) program crashed: possible deadlock in rfcomm_security_cfm 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_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, &(0x7f0000005dc0)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x15}, 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$bt_rfcomm-syz_emit_vhci detailed listing: executing program 0: syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) syz_emit_vhci(&(0x7f0000003980)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x6, 0xc8}}}, 0x6) 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}}): connect$bt_rfcomm-syz_emit_vhci detailed listing: executing program 0: connect$bt_rfcomm(0xffffffffffffffff, &(0x7f0000005dc0)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x15}, 0xa) syz_emit_vhci(&(0x7f0000003980)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x6, 0xc8}}}, 0x6) 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-syz_emit_vhci detailed listing: executing program 0: r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, 0x0, 0x0) syz_emit_vhci(&(0x7f0000003980)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x6, 0xc8}}}, 0x6) 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-syz_emit_vhci detailed listing: executing program 0: r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f0000005dc0)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x15}, 0xa) syz_emit_vhci(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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm 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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm 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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program did not crash testing compiled C program (duration=30s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program did not crash testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program did not crash testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false 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-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false 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-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program did not crash testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci program crashed: possible deadlock in rfcomm_security_cfm testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci detailed listing: executing program 0: r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f0000005dc0)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x15}, 0xa) syz_emit_vhci(&(0x7f0000003980)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x6, 0xc8}}}, 0x6) program crashed: possible deadlock in rfcomm_security_cfm validation run: crashed=true testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci detailed listing: executing program 0: r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f0000005dc0)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x15}, 0xa) syz_emit_vhci(&(0x7f0000003980)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x6, 0xc8}}}, 0x6) program crashed: possible deadlock in rfcomm_security_cfm validation run: crashed=true testing program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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: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_init_net_socket$bt_rfcomm-connect$bt_rfcomm-syz_emit_vhci detailed listing: executing program 0: r0 = syz_init_net_socket$bt_rfcomm(0x1f, 0x1, 0x3) connect$bt_rfcomm(r0, &(0x7f0000005dc0)={0x1f, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x15}, 0xa) syz_emit_vhci(&(0x7f0000003980)=@HCI_EVENT_PKT={0x4, @hci_ev_auth_complete={{0x6, 0x3}, {0x6, 0xc8}}}, 0x6) program crashed: possible deadlock in rfcomm_security_cfm validation run: crashed=true reproducing took 14m3.048720613s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ kworker/u34:2/5752 is trying to acquire lock: ffffffff90f83f60 (rfcomm_mutex){+.+.}-{4:4}, at: rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2223 but task is already holding lock: ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_cfm include/net/bluetooth/hci_core.h:2200 [inline] ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_complete_evt+0x77c/0x1180 net/bluetooth/hci_event.c:3554 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (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:2164 [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:4087 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 (&hdev->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 l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7289 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 -> #0 (rfcomm_mutex){+.+.}-{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 rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2223 hci_auth_cfm include/net/bluetooth/hci_core.h:2203 [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:4087 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 other info that might help us debug this: Chain exists of: rfcomm_mutex --> &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(rfcomm_mutex); *** DEADLOCK *** locks held by kworker/u34:2/5752: 4, last CPU#1: #0: ffff8880233b0940 ((wq_completion)hci3#2){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371 #1: ffffc90002737d08 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372 #2: ffff888054e440b8 (&hdev->lock){+.+.}-{4:4}, at: hci_auth_complete_evt+0x99/0x1180 net/bluetooth/hci_event.c:3522 #3: ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_cfm include/net/bluetooth/hci_core.h:2200 [inline] #3: ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_complete_evt+0x77c/0x1180 net/bluetooth/hci_event.c:3554 stack backtrace: CPU: 1 UID: 0 PID: 5752 Comm: kworker/u34:2 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 Workqueue: hci3 hci_rx_work 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 rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2223 hci_auth_cfm include/net/bluetooth/hci_core.h:2203 [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:4087 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 Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci1: command tx timeout final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ kworker/u34:2/5752 is trying to acquire lock: ffffffff90f83f60 (rfcomm_mutex){+.+.}-{4:4}, at: rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2223 but task is already holding lock: ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_cfm include/net/bluetooth/hci_core.h:2200 [inline] ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_complete_evt+0x77c/0x1180 net/bluetooth/hci_event.c:3554 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (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:2164 [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:4087 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 (&hdev->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 l2cap_chan_connect+0xac/0x2110 net/bluetooth/l2cap_core.c:7289 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 -> #0 (rfcomm_mutex){+.+.}-{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 rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2223 hci_auth_cfm include/net/bluetooth/hci_core.h:2203 [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:4087 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 other info that might help us debug this: Chain exists of: rfcomm_mutex --> &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(rfcomm_mutex); *** DEADLOCK *** locks held by kworker/u34:2/5752: 4, last CPU#1: #0: ffff8880233b0940 ((wq_completion)hci3#2){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371 #1: ffffc90002737d08 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372 #2: ffff888054e440b8 (&hdev->lock){+.+.}-{4:4}, at: hci_auth_complete_evt+0x99/0x1180 net/bluetooth/hci_event.c:3522 #3: ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_cfm include/net/bluetooth/hci_core.h:2200 [inline] #3: ffffffff90f57180 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_auth_complete_evt+0x77c/0x1180 net/bluetooth/hci_event.c:3554 stack backtrace: CPU: 1 UID: 0 PID: 5752 Comm: kworker/u34:2 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 Workqueue: hci3 hci_rx_work 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 rfcomm_security_cfm+0x3f/0x4b0 net/bluetooth/rfcomm/core.c:2223 hci_auth_cfm include/net/bluetooth/hci_core.h:2203 [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:4087 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 Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci1: command tx timeout