[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.236' (ECDSA) to the list of known hosts. syzkaller login: [ 70.416499][ T8462] chnl_net:caif_netlink_parms(): no params data found [ 70.484016][ T8462] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.492749][ T8462] bridge0: port 1(bridge_slave_0) entered disabled state [ 70.501420][ T8462] device bridge_slave_0 entered promiscuous mode [ 70.511430][ T8462] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.518702][ T8462] bridge0: port 2(bridge_slave_1) entered disabled state [ 70.527684][ T8462] device bridge_slave_1 entered promiscuous mode [ 70.556777][ T8462] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 70.568290][ T8462] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 70.601747][ T8462] team0: Port device team_slave_0 added [ 70.609650][ T8462] team0: Port device team_slave_1 added [ 70.637123][ T8462] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 70.644568][ T8462] 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. [ 70.671104][ T8462] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 70.684529][ T8462] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 70.691637][ T8462] 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. [ 70.718534][ T8462] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 70.754734][ T8462] device hsr_slave_0 entered promiscuous mode [ 70.762052][ T8462] device hsr_slave_1 entered promiscuous mode [ 70.885377][ T8462] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 70.896809][ T8462] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 70.907086][ T8462] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 70.917312][ T8462] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 70.942743][ T8462] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.950048][ T8462] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.958140][ T8462] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.965475][ T8462] bridge0: port 1(bridge_slave_0) entered forwarding state [ 71.007661][ T8462] 8021q: adding VLAN 0 to HW filter on device bond0 [ 71.023368][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 71.035865][ T2963] bridge0: port 1(bridge_slave_0) entered disabled state [ 71.045129][ T2963] bridge0: port 2(bridge_slave_1) entered disabled state [ 71.054109][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 71.067539][ T8462] 8021q: adding VLAN 0 to HW filter on device team0 [ 71.080068][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 71.088944][ T2963] bridge0: port 1(bridge_slave_0) entered blocking state [ 71.096073][ T2963] bridge0: port 1(bridge_slave_0) entered forwarding state [ 71.121235][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 71.133444][ T2963] bridge0: port 2(bridge_slave_1) entered blocking state [ 71.141023][ T2963] bridge0: port 2(bridge_slave_1) entered forwarding state [ 71.150000][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 71.160787][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 71.169948][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 71.182955][ T8462] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 71.197825][ T8462] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 71.208239][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 71.217415][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 71.236685][ T4889] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 71.244540][ T4889] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 71.258985][ T8462] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 71.280186][ T4889] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 71.300340][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 71.308530][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 71.317668][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 71.328815][ T8462] device veth0_vlan entered promiscuous mode [ 71.341194][ T8462] device veth1_vlan entered promiscuous mode [ 71.363913][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 71.372576][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 71.381087][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 71.392247][ T8462] device veth0_macvtap entered promiscuous mode [ 71.401999][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 71.413850][ T8462] device veth1_macvtap entered promiscuous mode [ 71.433141][ T8462] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 71.443175][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 71.455001][ T4843] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 71.468360][ T8462] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 71.478333][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 71.487453][ T2963] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 71.499947][ T8462] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 71.508960][ T8462] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 71.522951][ T8462] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 71.537810][ T8462] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 71.581401][ T8462] [ 71.583884][ T8462] ====================================================== [ 71.590980][ T8462] WARNING: possible circular locking dependency detected [ 71.597975][ T8462] 5.14.0-rc3-next-20210728-syzkaller #0 Not tainted [ 71.604547][ T8462] ------------------------------------------------------ [ 71.611665][ T8462] syz-executor907/8462 is trying to acquire lock: [ 71.618086][ T8462] ffffffff8d0d9aa8 (rtnl_mutex){+.+.}-{3:3}, at: br_del_bridge+0x14/0x110 [ 71.626619][ T8462] [ 71.626619][ T8462] but task is already holding lock: [ 71.633968][ T8462] ffffffff8d0b7b48 (br_ioctl_mutex){+.+.}-{3:3}, at: br_ioctl_call+0x3b/0xa0 [ 71.642751][ T8462] [ 71.642751][ T8462] which lock already depends on the new lock. [ 71.642751][ T8462] [ 71.653358][ T8462] [ 71.653358][ T8462] the existing dependency chain (in reverse order) is: [ 71.662352][ T8462] [ 71.662352][ T8462] -> #1 (br_ioctl_mutex){+.+.}-{3:3}: [ 71.669907][ T8462] __mutex_lock+0x131/0x1300 [ 71.675003][ T8462] br_ioctl_call+0x3b/0xa0 [ 71.679922][ T8462] dev_ifsioc+0xc1f/0xf60 [ 71.684751][ T8462] dev_ioctl+0x1b9/0xee0 [ 71.689504][ T8462] sock_do_ioctl+0x18b/0x210 [ 71.694598][ T8462] sock_ioctl+0x2f1/0x640 [ 71.699517][ T8462] __x64_sys_ioctl+0x193/0x200 [ 71.704963][ T8462] do_syscall_64+0x35/0xb0 [ 71.710051][ T8462] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 71.716533][ T8462] [ 71.716533][ T8462] -> #0 (rtnl_mutex){+.+.}-{3:3}: [ 71.723713][ T8462] __lock_acquire+0x2a07/0x54a0 [ 71.729102][ T8462] lock_acquire+0x1ab/0x510 [ 71.734197][ T8462] __mutex_lock+0x131/0x1300 [ 71.739294][ T8462] br_del_bridge+0x14/0x110 [ 71.744308][ T8462] br_ioctl_stub+0x2f1/0x7f0 [ 71.749488][ T8462] br_ioctl_call+0x5e/0xa0 [ 71.754424][ T8462] sock_ioctl+0x30c/0x640 [ 71.759259][ T8462] __x64_sys_ioctl+0x193/0x200 [ 71.764609][ T8462] do_syscall_64+0x35/0xb0 [ 71.769621][ T8462] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 71.776016][ T8462] [ 71.776016][ T8462] other info that might help us debug this: [ 71.776016][ T8462] [ 71.786485][ T8462] Possible unsafe locking scenario: [ 71.786485][ T8462] [ 71.793997][ T8462] CPU0 CPU1 [ 71.799347][ T8462] ---- ---- [ 71.804689][ T8462] lock(br_ioctl_mutex); [ 71.808992][ T8462] lock(rtnl_mutex); [ 71.815472][ T8462] lock(br_ioctl_mutex); [ 71.822301][ T8462] lock(rtnl_mutex); [ 71.826268][ T8462] [ 71.826268][ T8462] *** DEADLOCK *** [ 71.826268][ T8462] [ 71.834405][ T8462] 1 lock held by syz-executor907/8462: [ 71.839932][ T8462] #0: ffffffff8d0b7b48 (br_ioctl_mutex){+.+.}-{3:3}, at: br_ioctl_call+0x3b/0xa0 [ 71.849158][ T8462] [ 71.849158][ T8462] stack backtrace: [ 71.855313][ T8462] CPU: 1 PID: 8462 Comm: syz-executor907 Not tainted 5.14.0-rc3-next-20210728-syzkaller #0 [ 71.865550][ T8462] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.875623][ T8462] Call Trace: [ 71.878897][ T8462] dump_stack_lvl+0xcd/0x134 [ 71.883479][ T8462] check_noncircular+0x25f/0x2e0 [ 71.888402][ T8462] ? print_circular_bug+0x1e0/0x1e0 [ 71.893600][ T8462] ? kernel_text_address+0xbd/0xf0 [ 71.898712][ T8462] ? lockdep_lock+0xc6/0x200 [ 71.903293][ T8462] ? call_rcu_zapped+0xb0/0xb0 [ 71.908144][ T8462] __lock_acquire+0x2a07/0x54a0 [ 71.913131][ T8462] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.919125][ T8462] ? _find_first_zero_bit+0x94/0xb0 [ 71.924850][ T8462] lock_acquire+0x1ab/0x510 [ 71.930594][ T8462] ? br_del_bridge+0x14/0x110 [ 71.935861][ T8462] ? lock_release+0x720/0x720 [ 71.940755][ T8462] __mutex_lock+0x131/0x1300 [ 71.945532][ T8462] ? br_del_bridge+0x14/0x110 [ 71.950231][ T8462] ? find_held_lock+0x2d/0x110 [ 71.955195][ T8462] ? br_del_bridge+0x14/0x110 [ 71.960317][ T8462] ? mutex_lock_io_nested+0x1160/0x1160 [ 71.965879][ T8462] ? lock_downgrade+0x6e0/0x6e0 [ 71.970818][ T8462] br_del_bridge+0x14/0x110 [ 71.975396][ T8462] br_ioctl_stub+0x2f1/0x7f0 [ 71.979977][ T8462] ? mutex_lock_io_nested+0x1160/0x1160 [ 71.985517][ T8462] ? __sanitizer_cov_trace_switch+0x63/0xf0 [ 71.991421][ T8462] ? br_dev_siocdevprivate+0x15c0/0x15c0 [ 71.997034][ T8462] ? do_vfs_ioctl+0x132/0x15d0 [ 72.001783][ T8462] ? vfs_fileattr_set+0xb50/0xb50 [ 72.006798][ T8462] ? br_dev_siocdevprivate+0x15c0/0x15c0 [ 72.012605][ T8462] br_ioctl_call+0x5e/0xa0 [ 72.017218][ T8462] sock_ioctl+0x30c/0x640 [ 72.021544][ T8462] ? br_ioctl_call+0xa0/0xa0 [ 72.026117][ T8462] ? lock_downgrade+0x6e0/0x6e0 [ 72.030954][ T8462] ? lock_downgrade+0x6e0/0x6e0 [ 72.035926][ T8462] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 72.042164][ T8462] ? br_ioctl_call+0xa0/0xa0 [ 72.046748][ T8462] __x64_sys_ioctl+0x193/0x200 [ 72.051498][ T8462] do_syscall_64+0x35/0xb0 [ 72.056090][ T8462] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 72.062066][ T8462] RIP: 0033:0x443149 [ 72.065960][ T8462] Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 72.085556][ T8462] RSP: 002b:00007ffdb879b828 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 72.093952][ T8462] RAX: ffffffffffffffda RBX: 00007ffdb879b838 RCX: 0000000000443149 [ 72.101991][ T8462] RDX: 00000000200000c0 RSI: 00000000000089a1 RDI: 0000000000000005 [ 72.109962][ T8462] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 72.117915][ T8462] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdb879b840 [ 72.125959][ T8462] R13: 00007ffdb879b860 R14: 00000000004b8018 R15: 00000000004004b8