possible deadlock in lapbeth_device_event ============================================ WARNING: possible recursive locking detected 6.14.0-rc7-syzkaller-01431-gbfc17c165835 #0 Not tainted -------------------------------------------- dhcpcd/5501 is trying to acquire lock: ffff88807af14d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2731 [inline] ffff88807af14d28 (&dev->lock){+.+.}-{4:4}, at: netif_napi_add_weight include/linux/netdevice.h:2763 [inline] ffff88807af14d28 (&dev->lock){+.+.}-{4:4}, at: lapbeth_new_device drivers/net/wan/lapbether.c:415 [inline] ffff88807af14d28 (&dev->lock){+.+.}-{4:4}, at: lapbeth_device_event+0x766/0xa20 drivers/net/wan/lapbether.c:460 but task is already holding lock: ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2731 [inline] ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:40 [inline] ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0x120/0x270 net/core/dev_api.c:67 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&dev->lock); lock(&dev->lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by dhcpcd/5501: #0: ffffffff8fed7108 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8fed7108 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x34c/0x1d80 net/ipv4/devinet.c:1121 #1: ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2731 [inline] #1: ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:40 [inline] #1: ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0x120/0x270 net/core/dev_api.c:67 stack backtrace: CPU: 0 UID: 0 PID: 5501 Comm: dhcpcd Not tainted 6.14.0-rc7-syzkaller-01431-gbfc17c165835 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3039 check_deadlock kernel/locking/lockdep.c:3091 [inline] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3893 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730 netdev_lock include/linux/netdevice.h:2731 [inline] netif_napi_add_weight include/linux/netdevice.h:2763 [inline] lapbeth_new_device drivers/net/wan/lapbether.c:415 [inline] lapbeth_device_event+0x766/0xa20 drivers/net/wan/lapbether.c:460 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 __dev_notify_flags+0x207/0x400 netif_change_flags+0xf0/0x1a0 net/core/dev.c:9406 dev_change_flags+0x146/0x270 net/core/dev_api.c:68 devinet_ioctl+0xea2/0x1d80 net/ipv4/devinet.c:1200 inet_ioctl+0x3d7/0x4f0 net/ipv4/af_inet.c:1001 sock_do_ioctl+0x158/0x460 net/socket.c:1190 sock_ioctl+0x626/0x8e0 net/socket.c:1309 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe4920d9d49 Code: 5c c3 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 76 10 48 8b 15 ae 60 0d 00 f7 d8 41 83 c8 RSP: 002b:00007ffd6f912788 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe49200b6c0 RCX: 00007fe4920d9d49 RDX: 00007ffd6f922978 RSI: 0000000000008914 RDI: 000000000000000e RBP: 00007ffd6f932b38 R08: 00007ffd6f922938 R09: 00007ffd6f9228e8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd6f922978 R14: 0000000000000028 R15: 0000000000008914 Warning: Permanently added '10.128.1.3' (ED25519) to the list of known hosts. 2025/03/24 03:51:52 ignoring optional flag "sandboxArg"="0" 2025/03/24 03:51:54 parsed 1 programs [ 69.217578][ T5834] cgroup: Unknown subsys name 'net' [ 69.384671][ T5834] cgroup: Unknown subsys name 'cpuset' [ 69.393790][ T5834] cgroup: Unknown subsys name 'rlimit' [ 70.745183][ T5834] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 71.805868][ T1298] ieee802154 phy0 wpan0: encryption failed: -22 [ 71.812473][ T1298] ieee802154 phy1 wpan1: encryption failed: -22 [ 73.526604][ T5840] chnl_net:caif_netlink_parms(): no params data found [ 73.575931][ T5840] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.583810][ T5840] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.591138][ T5840] bridge_slave_0: entered allmulticast mode [ 73.598294][ T5840] bridge_slave_0: entered promiscuous mode [ 73.607215][ T5840] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.614707][ T5840] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.622407][ T5840] bridge_slave_1: entered allmulticast mode [ 73.629121][ T5840] bridge_slave_1: entered promiscuous mode [ 73.650549][ T5840] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 73.661540][ T5840] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 73.685881][ T5840] team0: Port device team_slave_0 added [ 73.693220][ T5840] team0: Port device team_slave_1 added [ 73.712278][ T5840] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 73.719243][ T5840] 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. [ 73.745823][ T5840] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 73.758551][ T5840] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 73.765546][ T5840] 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. [ 73.791639][ T5840] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 73.823560][ T5840] hsr_slave_0: entered promiscuous mode [ 73.829718][ T5840] hsr_slave_1: entered promiscuous mode [ 73.922069][ T5840] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 73.934429][ T5840] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 73.945481][ T5840] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 73.955810][ T5840] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 73.979977][ T5840] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.987806][ T5840] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.995946][ T5840] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.003089][ T5840] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.046622][ T5840] 8021q: adding VLAN 0 to HW filter on device bond0 [ 74.065650][ T13] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.075159][ T13] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.091518][ T5840] 8021q: adding VLAN 0 to HW filter on device team0 [ 74.104997][ T1901] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.112327][ T1901] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.125722][ T13] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.132885][ T13] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.250712][ T5840] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 74.283296][ T5840] veth0_vlan: entered promiscuous mode [ 74.294267][ T5840] veth1_vlan: entered promiscuous mode [ 74.316260][ T5840] veth0_macvtap: entered promiscuous mode [ 74.326310][ T5840] veth1_macvtap: entered promiscuous mode [ 74.340853][ T5840] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 74.357862][ T5840] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 74.368778][ T5840] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.378291][ T5840] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.387381][ T5840] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.396440][ T5840] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.474903][ T5840] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality. [ 74.592053][ T13] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 74.653558][ T13] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 74.725115][ T13] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 74.778141][ T13] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 74.836459][ T36] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.847739][ T36] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 74.871303][ T82] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.879642][ T82] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 77.037818][ T5928] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 77.046627][ T5928] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 77.055855][ T5928] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 77.063956][ T5928] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 77.073395][ T5928] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 77.080977][ T5928] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 [ 77.527227][ T13] bridge_slave_1: left allmulticast mode [ 77.553712][ T13] bridge_slave_1: left promiscuous mode [ 77.559908][ T13] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.633896][ T13] bridge_slave_0: left allmulticast mode [ 77.639622][ T13] bridge_slave_0: left promiscuous mode [ 77.662595][ T13] bridge0: port 1(bridge_slave_0) entered disabled state 2025/03/24 03:52:05 executed programs: 0 [ 78.174348][ T5146] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 78.193469][ T5146] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 78.205512][ T5146] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 78.218226][ T5146] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 78.226543][ T5146] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 78.234820][ T5146] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 [ 78.242195][ T13] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface [ 78.260058][ T13] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface [ 78.270162][ T13] bond0 (unregistering): Released all slaves [ 78.285007][ T5501] [ 78.287500][ T5501] ============================================ [ 78.293654][ T5501] WARNING: possible recursive locking detected [ 78.299794][ T5501] 6.14.0-rc7-syzkaller-01431-gbfc17c165835 #0 Not tainted [ 78.306880][ T5501] -------------------------------------------- [ 78.313010][ T5501] dhcpcd/5501 is trying to acquire lock: [ 78.318642][ T5501] ffff88807af14d28 (&dev->lock){+.+.}-{4:4}, at: lapbeth_device_event+0x766/0xa20 [ 78.327857][ T5501] [ 78.327857][ T5501] but task is already holding lock: [ 78.335231][ T5501] ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0x120/0x270 [ 78.344088][ T5501] [ 78.344088][ T5501] other info that might help us debug this: [ 78.352126][ T5501] Possible unsafe locking scenario: [ 78.352126][ T5501] [ 78.359582][ T5501] CPU0 [ 78.362849][ T5501] ---- [ 78.366133][ T5501] lock(&dev->lock); [ 78.370107][ T5501] lock(&dev->lock); [ 78.374080][ T5501] [ 78.374080][ T5501] *** DEADLOCK *** [ 78.374080][ T5501] [ 78.382384][ T5501] May be due to missing lock nesting notation [ 78.382384][ T5501] [ 78.390687][ T5501] 2 locks held by dhcpcd/5501: [ 78.395434][ T5501] #0: ffffffff8fed7108 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x34c/0x1d80 [ 78.404569][ T5501] #1: ffff888035340d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0x120/0x270 [ 78.413871][ T5501] [ 78.413871][ T5501] stack backtrace: [ 78.419758][ T5501] CPU: 0 UID: 0 PID: 5501 Comm: dhcpcd Not tainted 6.14.0-rc7-syzkaller-01431-gbfc17c165835 #0 [ 78.419772][ T5501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 78.419783][ T5501] Call Trace: [ 78.419790][ T5501] [ 78.419796][ T5501] dump_stack_lvl+0x241/0x360 [ 78.419813][ T5501] ? __pfx_dump_stack_lvl+0x10/0x10 [ 78.419826][ T5501] ? __pfx__printk+0x10/0x10 [ 78.419837][ T5501] ? lockdep_unlock+0x16a/0x300 [ 78.419858][ T5501] print_deadlock_bug+0x483/0x620 [ 78.419873][ T5501] validate_chain+0x15e2/0x5920 [ 78.419889][ T5501] ? is_bpf_text_address+0x26/0x2a0 [ 78.419903][ T5501] ? unwind_next_frame+0x18e6/0x22d0 [ 78.419921][ T5501] ? __pfx_validate_chain+0x10/0x10 [ 78.419934][ T5501] ? preempt_count_add+0x93/0x190 [ 78.419951][ T5501] ? is_bpf_text_address+0x285/0x2a0 [ 78.419962][ T5501] ? is_bpf_text_address+0x26/0x2a0 [ 78.419973][ T5501] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 78.419990][ T5501] ? kernel_text_address+0xa7/0xe0 [ 78.420003][ T5501] ? look_up_lock_class+0x77/0x170 [ 78.420020][ T5501] ? register_lock_class+0x102/0x980 [ 78.420039][ T5501] ? __pfx_register_lock_class+0x10/0x10 [ 78.420057][ T5501] ? mark_lock+0x9a/0x360 [ 78.420069][ T5501] __lock_acquire+0x1397/0x2100 [ 78.420091][ T5501] lock_acquire+0x1ed/0x550 [ 78.420108][ T5501] ? lapbeth_device_event+0x766/0xa20 [ 78.420123][ T5501] ? __pfx_lock_acquire+0x10/0x10 [ 78.420141][ T5501] ? __pfx___might_resched+0x10/0x10 [ 78.420161][ T5501] __mutex_lock+0x19c/0x1010 [ 78.420178][ T5501] ? lapbeth_device_event+0x766/0xa20 [ 78.420192][ T5501] ? __asan_memset+0x23/0x50 [ 78.420205][ T5501] ? lapbeth_device_event+0x766/0xa20 [ 78.420217][ T5501] ? __pfx___mutex_lock+0x10/0x10 [ 78.420237][ T5501] ? __raw_spin_lock_init+0x45/0x100 [ 78.420253][ T5501] lapbeth_device_event+0x766/0xa20 [ 78.420267][ T5501] notifier_call_chain+0x1a5/0x3f0 [ 78.420286][ T5501] __dev_notify_flags+0x207/0x400 [ 78.420300][ T5501] ? dev_set_rx_mode+0xb8/0x2e0 [ 78.420313][ T5501] ? __pfx___dev_notify_flags+0x10/0x10 [ 78.420326][ T5501] ? __dev_change_flags+0x515/0x6f0 [ 78.420339][ T5501] ? __pfx___mutex_lock+0x10/0x10 [ 78.420356][ T5501] ? __pfx___dev_change_flags+0x10/0x10 [ 78.420408][ T5501] ? __pfx___mutex_lock+0x10/0x10 [ 78.420426][ T5501] netif_change_flags+0xf0/0x1a0 [ 78.420441][ T5501] dev_change_flags+0x146/0x270 [ 78.420454][ T5501] devinet_ioctl+0xea2/0x1d80 [ 78.420470][ T5501] ? __pfx_devinet_ioctl+0x10/0x10 [ 78.420483][ T5501] ? get_user_ifreq+0x1bb/0x200 [ 78.420500][ T5501] inet_ioctl+0x3d7/0x4f0 [ 78.420515][ T5501] ? __pfx_inet_ioctl+0x10/0x10 [ 78.420531][ T5501] ? tomoyo_path_number_perm+0x5dd/0x770 [ 78.420556][ T5501] sock_do_ioctl+0x158/0x460 [ 78.420574][ T5501] ? __pfx_sock_do_ioctl+0x10/0x10 [ 78.420592][ T5501] ? __pfx_lock_release+0x10/0x10 [ 78.420613][ T5501] sock_ioctl+0x626/0x8e0 [ 78.420630][ T5501] ? __pfx_sock_ioctl+0x10/0x10 [ 78.420646][ T5501] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 78.420665][ T5501] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 78.420683][ T5501] ? __pfx_sock_ioctl+0x10/0x10 [ 78.420699][ T5501] __se_sys_ioctl+0xf5/0x170 [ 78.420713][ T5501] do_syscall_64+0xf3/0x230 [ 78.420731][ T5501] ? clear_bhb_loop+0x35/0x90 [ 78.420749][ T5501] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.420772][ T5501] RIP: 0033:0x7fe4920d9d49 [ 78.420787][ T5501] Code: 5c c3 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 76 10 48 8b 15 ae 60 0d 00 f7 d8 41 83 c8 [ 78.420797][ T5501] RSP: 002b:00007ffd6f912788 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 78.420810][ T5501] RAX: ffffffffffffffda RBX: 00007fe49200b6c0 RCX: 00007fe4920d9d49 [ 78.420819][ T5501] RDX: 00007ffd6f922978 RSI: 0000000000008914 RDI: 000000000000000e [ 78.420827][ T5501] RBP: 00007ffd6f932b38 R08: 00007ffd6f922938 R09: 00007ffd6f9228e8 [ 78.420836][ T5501] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 78.420843][ T5501] R13: 00007ffd6f922978 R14: 0000000000000028 R15: 0000000000008914 [ 78.420856][ T5501] [ 78.858693][ T13] hsr_slave_0: left promiscuous mode [ 78.864898][ T13] hsr_slave_1: left promiscuous mode [ 78.870692][ T13] batman_adv: batadv0: Interface deactivated: batadv_slave_0 [ 78.878832][ T13] batman_adv: batadv0: Removing interface: batadv_slave_0 [ 78.887329][ T13] batman_adv: batadv0: Interface deactivated: batadv_slave_1 [ 78.895026][ T13] batman_adv: batadv0: Removing interface: batadv_slave_1 [ 78.904426][ T13] veth1_macvtap: left promiscuous mode [ 78.909933][ T13] veth0_macvtap: left promiscuous mode [ 78.915554][ T13] veth1_vlan: left promiscuous mode [ 78.920831][ T13] veth0_vlan: left promiscuous mode [ 79.093807][ T13] team0 (unregistering): Port device team_slave_1 removed [ 79.116923][ T13] team0 (unregistering): Port device team_slave_0 removed [ 79.368676][ T5958] chnl_net:caif_netlink_parms(): no params data found [ 79.456092][ T5958] bridge0: port 1(bridge_slave_0) entered blocking state [ 79.466344][ T5958] bridge0: port 1(bridge_slave_0) entered disabled state [ 79.473922][ T5958] bridge_slave_0: entered allmulticast mode [ 79.480638][ T5958] bridge_slave_0: entered promiscuous mode [ 79.488710][ T5958] bridge0: port 2(bridge_slave_1) entered blocking state [ 79.496136][ T5958] bridge0: port 2(bridge_slave_1) entered disabled state [ 79.504035][ T5958] bridge_slave_1: entered allmulticast mode [ 79.510788][ T5958] bridge_slave_1: entered promiscuous mode [ 79.544226][ T5958] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 79.562561][ T5958] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 79.597003][ T5958] team0: Port device team_slave_0 added [ 79.604811][ T5958] team0: Port device team_slave_1 added [ 79.621892][ T5958] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 79.628856][ T5958] 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. [ 79.654902][ T5958] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 79.666801][ T5958] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 79.673812][ T5958] 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. [ 79.699872][ T5958] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 79.729237][ T5958] hsr_slave_0: entered promiscuous mode [ 79.735358][ T5958] hsr_slave_1: entered promiscuous mode [ 80.080388][ T5958] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 80.100746][ T5958] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 80.110449][ T5958] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 80.120948][ T5958] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 80.144084][ T5958] bridge0: port 2(bridge_slave_1) entered blocking state [ 80.151405][ T5958] bridge0: port 2(bridge_slave_1) entered forwarding state [ 80.158843][ T5958] bridge0: port 1(bridge_slave_0) entered blocking state [ 80.166001][ T5958] bridge0: port 1(bridge_slave_0) entered forwarding state [ 80.211100][ T5958] 8021q: adding VLAN 0 to HW filter on device bond0 [ 80.227219][ T5958] 8021q: adding VLAN 0 to HW filter on device team0 [ 80.235702][ T36] bridge0: port 1(bridge_slave_0) entered disabled state [ 80.243603][ T36] bridge0: port 2(bridge_slave_1) entered disabled state [ 80.256055][ T3583] bridge0: port 1(bridge_slave_0) entered blocking state [ 80.263190][ T3583] bridge0: port 1(bridge_slave_0) entered forwarding state [ 80.277088][ T36] bridge0: port 2(bridge_slave_1) entered blocking state [ 80.284217][ T36] bridge0: port 2(bridge_slave_1) entered forwarding state [ 80.292383][ T5928] Bluetooth: hci0: command tx timeout [ 80.424957][ T5958] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 80.456053][ T5958] veth0_vlan: entered promiscuous mode [ 80.468989][ T5958] veth1_vlan: entered promiscuous mode [ 80.490939][ T5958] veth0_macvtap: entered promiscuous mode [ 80.501300][ T5958] veth1_macvtap: entered promiscuous mode [ 80.518711][ T5958] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 80.533313][ T5958] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 80.544452][ T5958] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 80.554722][ T5958] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 80.564433][ T5958] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 80.573796][ T5958] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 80.603532][ T5958] ieee80211 phy5: Selected rate control algorithm 'minstrel_ht' [ 80.625868][ T1901] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 80.627367][ T5958] ieee80211 phy6: Selected rate control algorithm 'minstrel_ht' [ 80.651745][ T1901] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 80.668549][ T82] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 80.678058][ T82] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 syzkaller build log: go env (err=) GO111MODULE='auto' GOARCH='amd64' GOBIN='' GOCACHE='/syzkaller/.cache/go-build' GOENV='/syzkaller/.config/go/env' GOEXE='' GOEXPERIMENT='' GOFLAGS='' GOHOSTARCH='amd64' GOHOSTOS='linux' GOINSECURE='' GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod' GONOPROXY='' GONOSUMDB='' GOOS='linux' GOPATH='/syzkaller/jobs-2/linux/gopath' GOPRIVATE='' GOPROXY='https://proxy.golang.org,direct' GOROOT='/syzkaller/jobs-2/linux/gopath/pkg/mod/golang.org/toolchain@v0.0.1-go1.23.6.linux-amd64' GOSUMDB='sum.golang.org' GOTMPDIR='' GOTOOLCHAIN='auto' GOTOOLDIR='/syzkaller/jobs-2/linux/gopath/pkg/mod/golang.org/toolchain@v0.0.1-go1.23.6.linux-amd64/pkg/tool/linux_amd64' GOVCS='' GOVERSION='go1.23.6' GODEBUG='' GOTELEMETRY='local' GOTELEMETRYDIR='/syzkaller/.config/go/telemetry' GCCGO='gccgo' GOAMD64='v1' AR='ar' CC='gcc' CXX='g++' CGO_ENABLED='1' GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod' GOWORK='' CGO_CFLAGS='-O2 -g' CGO_CPPFLAGS='' CGO_CXXFLAGS='-O2 -g' CGO_FFLAGS='-O2 -g' CGO_LDFLAGS='-O2 -g' PKG_CONFIG='pkg-config' GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3088158697=/tmp/go-build -gno-record-gcc-switches' git status (err=) HEAD detached at 831e362911 nothing to commit, working tree clean tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen make .descriptions tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env bin/syz-sysgen touch .descriptions GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=831e3629115be4f5e68e6e0df3a5b07eed26daa4 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20250305-205027'" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog mkdir -p ./bin/linux_amd64 g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \ -m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \ -DHOSTGOOS_linux=1 -DGIT_REVISION=\"831e3629115be4f5e68e6e0df3a5b07eed26daa4\" /usr/bin/ld: /tmp/cc7liYWd.o: in function `Connection::Connect(char const*, char const*)': executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking