[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. 2021/07/31 00:06:25 parsed 1 programs 2021/07/31 00:06:25 executed programs: 0 syzkaller login: [ 1217.813334][ T8463] chnl_net:caif_netlink_parms(): no params data found [ 1217.868584][ T8463] bridge0: port 1(bridge_slave_0) entered blocking state [ 1217.877690][ T8463] bridge0: port 1(bridge_slave_0) entered disabled state [ 1217.887568][ T8463] device bridge_slave_0 entered promiscuous mode [ 1217.898906][ T8463] bridge0: port 2(bridge_slave_1) entered blocking state [ 1217.906863][ T8463] bridge0: port 2(bridge_slave_1) entered disabled state [ 1217.915110][ T8463] device bridge_slave_1 entered promiscuous mode [ 1217.937976][ T8463] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1217.949338][ T8463] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1217.973808][ T8463] team0: Port device team_slave_0 added [ 1217.982037][ T8463] team0: Port device team_slave_1 added [ 1218.003336][ T8463] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1218.011122][ T8463] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 1218.040335][ T8463] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1218.054300][ T8463] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1218.061260][ T8463] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 1218.088420][ T8463] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1218.118432][ T8463] device hsr_slave_0 entered promiscuous mode [ 1218.125538][ T8463] device hsr_slave_1 entered promiscuous mode [ 1218.234750][ T8463] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 1218.246829][ T8463] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 1218.258304][ T8463] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 1218.269260][ T8463] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 1218.297205][ T8463] bridge0: port 2(bridge_slave_1) entered blocking state [ 1218.304717][ T8463] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1218.312859][ T8463] bridge0: port 1(bridge_slave_0) entered blocking state [ 1218.320065][ T8463] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1218.367537][ T8463] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1218.380588][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1218.392257][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 1218.402528][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 1218.411466][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1218.427006][ T8463] 8021q: adding VLAN 0 to HW filter on device team0 [ 1218.440916][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1218.452115][ T20] bridge0: port 1(bridge_slave_0) entered blocking state [ 1218.459460][ T20] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1218.473869][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1218.482416][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 1218.489712][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1218.507823][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1218.516554][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1218.534410][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1218.543398][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1218.557706][ T8683] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1218.569216][ T8463] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1218.587897][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1218.596056][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1218.609968][ T8463] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1218.631077][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1218.651583][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1218.660593][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1218.669380][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1218.681471][ T8463] device veth0_vlan entered promiscuous mode [ 1218.696706][ T8463] device veth1_vlan entered promiscuous mode [ 1218.719736][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1218.728690][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1218.738259][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1218.751136][ T8463] device veth0_macvtap entered promiscuous mode [ 1218.762470][ T8463] device veth1_macvtap entered promiscuous mode [ 1218.781945][ T8463] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1218.789678][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1218.800391][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1218.813355][ T8463] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1218.821306][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1218.831102][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1218.845559][ T8463] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 1218.854572][ T8463] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 1218.863344][ T8463] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 1218.875303][ T8463] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 1218.977239][ T8687] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 1218.995452][ T8687] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 1219.020752][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 1219.031455][ T8687] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 1219.040024][ T8687] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 1219.050721][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 1219.151491][ T8707] [ 1219.153842][ T8707] ============================================ [ 1219.160194][ T8707] WARNING: possible recursive locking detected [ 1219.166344][ T8707] 5.14.0-rc1-syzkaller #0 Not tainted [ 1219.171713][ T8707] -------------------------------------------- [ 1219.178026][ T8707] syz-executor.0/8707 is trying to acquire lock: [ 1219.184455][ T8707] ffff888029ce4340 (&u->iolock){+.+.}-{3:3}, at: __unix_dgram_recvmsg+0x226/0xb60 [ 1219.193848][ T8707] [ 1219.193848][ T8707] but task is already holding lock: [ 1219.201294][ T8707] ffff888029ce4340 (&u->iolock){+.+.}-{3:3}, at: unix_dgram_bpf_recvmsg+0xa49/0xd10 [ 1219.210686][ T8707] [ 1219.210686][ T8707] other info that might help us debug this: [ 1219.218820][ T8707] Possible unsafe locking scenario: [ 1219.218820][ T8707] [ 1219.226261][ T8707] CPU0 [ 1219.229523][ T8707] ---- [ 1219.232780][ T8707] lock(&u->iolock); [ 1219.236741][ T8707] lock(&u->iolock); [ 1219.240712][ T8707] [ 1219.240712][ T8707] *** DEADLOCK *** [ 1219.240712][ T8707] [ 1219.248843][ T8707] May be due to missing lock nesting notation [ 1219.248843][ T8707] [ 1219.257271][ T8707] 1 lock held by syz-executor.0/8707: [ 1219.262626][ T8707] #0: ffff888029ce4340 (&u->iolock){+.+.}-{3:3}, at: unix_dgram_bpf_recvmsg+0xa49/0xd10 [ 1219.272462][ T8707] [ 1219.272462][ T8707] stack backtrace: [ 1219.278458][ T8707] CPU: 0 PID: 8707 Comm: syz-executor.0 Not tainted 5.14.0-rc1-syzkaller #0 [ 1219.287230][ T8707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1219.297448][ T8707] Call Trace: [ 1219.300717][ T8707] dump_stack_lvl+0xcd/0x134 [ 1219.305422][ T8707] __lock_acquire.cold+0x149/0x3ab [ 1219.310687][ T8707] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 1219.316706][ T8707] lock_acquire+0x1ab/0x510 [ 1219.321199][ T8707] ? __unix_dgram_recvmsg+0x226/0xb60 [ 1219.326827][ T8707] ? lock_release+0x720/0x720 [ 1219.331511][ T8707] __mutex_lock+0x12a/0x10a0 [ 1219.336757][ T8707] ? __unix_dgram_recvmsg+0x226/0xb60 [ 1219.342121][ T8707] ? __unix_dgram_recvmsg+0x226/0xb60 [ 1219.347489][ T8707] ? mutex_lock_io_nested+0xf00/0xf00 [ 1219.352886][ T8707] ? mark_lock+0xef/0x17b0 [ 1219.357377][ T8707] __unix_dgram_recvmsg+0x226/0xb60 [ 1219.362572][ T8707] ? unix_stream_connect+0x1650/0x1650 [ 1219.368028][ T8707] ? unix_dgram_bpf_recvmsg+0xae0/0xd10 [ 1219.373575][ T8707] ? mark_held_locks+0x9f/0xe0 [ 1219.378331][ T8707] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 1219.384211][ T8707] unix_dgram_bpf_recvmsg+0x630/0xd10 [ 1219.389729][ T8707] ? unix_sysctl_unregister+0x80/0x80 [ 1219.395094][ T8707] ? __init_waitqueue_head+0xd0/0xd0 [ 1219.400553][ T8707] ? __might_fault+0xd3/0x180 [ 1219.405279][ T8707] unix_seqpacket_recvmsg+0xed/0x150 [ 1219.410563][ T8707] ? unix_dgram_recvmsg+0xf0/0xf0 [ 1219.415675][ T8707] ____sys_recvmsg+0x2c4/0x600 [ 1219.420666][ T8707] ? move_addr_to_kernel.part.0+0x110/0x110 [ 1219.426568][ T8707] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 1219.432953][ T8707] ? __import_iovec+0x2b5/0x580 [ 1219.437967][ T8707] ? import_iovec+0x10c/0x150 [ 1219.442826][ T8707] ___sys_recvmsg+0x127/0x200 [ 1219.447665][ T8707] ? __copy_msghdr_from_user+0x4b0/0x4b0 [ 1219.453290][ T8707] ? __fget_files+0x21b/0x3e0 [ 1219.458012][ T8707] ? lock_downgrade+0x6e0/0x6e0 [ 1219.462862][ T8707] ? __fget_files+0x23d/0x3e0 [ 1219.467587][ T8707] ? __fget_light+0xea/0x280 [ 1219.472188][ T8707] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 1219.478679][ T8707] __sys_recvmsg+0xe2/0x1a0 [ 1219.483302][ T8707] ? __sys_recvmsg_sock+0x40/0x40 [ 1219.488369][ T8707] ? syscall_enter_from_user_mode+0x21/0x70 [ 1219.494312][ T8707] do_syscall_64+0x35/0xb0 [ 1219.498724][ T8707] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 1219.504610][ T8707] RIP: 0033:0x4665e9 [ 1219.508511][ T8707] 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 bc ff ff ff f7 d8 64 89 01 48 [ 1219.528159][ T8707] RSP: 002b:00007fb9cdf8e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 1219.536566][ T8707] RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 [ 1219.544532][ T8707] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000005 [ 1219.552610][ T8707] RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 [ 1219.560577][ T8707] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 [ 1219.568555][ T8707] R13: 00007fffd2897e1f R14: 00007fb9cdf8e300 R15: 0000000000022000 [ 1219.623795][ T8603] Bluetooth: hci0: command 0x0409 tx timeout [ 1221.703418][ T8603] Bluetooth: hci0: command 0x041b tx timeout [ 1223.783254][ T8603] Bluetooth: hci0: command 0x040f tx timeout [ 1225.863085][ T8603] Bluetooth: hci0: command 0x0419 tx timeout