[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.103' (ECDSA) to the list of known hosts. 2021/01/27 15:18:29 fuzzer started 2021/01/27 15:18:30 connecting to host at 10.128.0.26:42187 2021/01/27 15:18:30 checking machine... 2021/01/27 15:18:30 checking revisions... 2021/01/27 15:18:30 testing simple program... syzkaller login: [ 67.870632][ T8424] IPVS: ftp: loaded support on port[0] = 21 [ 68.039411][ T8424] chnl_net:caif_netlink_parms(): no params data found [ 68.116995][ T8424] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.124596][ T8424] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.133097][ T8424] device bridge_slave_0 entered promiscuous mode [ 68.142523][ T8424] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.150464][ T8424] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.158753][ T8424] device bridge_slave_1 entered promiscuous mode [ 68.180199][ T8424] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 68.191193][ T8424] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 68.215073][ T8424] team0: Port device team_slave_0 added [ 68.223596][ T8424] team0: Port device team_slave_1 added [ 68.243604][ T8424] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 68.250677][ T8424] 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. [ 68.278249][ T8424] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 68.291441][ T8424] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 68.298875][ T8424] 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. [ 68.325290][ T8424] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 68.353010][ T8424] device hsr_slave_0 entered promiscuous mode [ 68.359831][ T8424] device hsr_slave_1 entered promiscuous mode [ 68.375323][ T8424] [ 68.377650][ T8424] ============================================ [ 68.383861][ T8424] WARNING: possible recursive locking detected [ 68.389983][ T8424] 5.11.0-rc5-next-20210127-syzkaller #0 Not tainted [ 68.396540][ T8424] -------------------------------------------- [ 68.402682][ T8424] syz-executor.0/8424 is trying to acquire lock: [ 68.408980][ T8424] ffff88801b0de5e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_netdev_notifier_call+0x615/0x1180 [ 68.419579][ T8424] [ 68.419579][ T8424] but task is already holding lock: [ 68.426933][ T8424] ffff88801b0de5e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: virt_wifi_newlink+0x4cb/0x940 [ 68.436408][ T8424] [ 68.436408][ T8424] other info that might help us debug this: [ 68.444529][ T8424] Possible unsafe locking scenario: [ 68.444529][ T8424] [ 68.452143][ T8424] CPU0 [ 68.455410][ T8424] ---- [ 68.458668][ T8424] lock(&rdev->wiphy.mtx); [ 68.463147][ T8424] lock(&rdev->wiphy.mtx); [ 68.467625][ T8424] [ 68.467625][ T8424] *** DEADLOCK *** [ 68.467625][ T8424] [ 68.475749][ T8424] May be due to missing lock nesting notation [ 68.475749][ T8424] [ 68.484062][ T8424] 2 locks held by syz-executor.0/8424: [ 68.489502][ T8424] #0: ffffffff8cc71b08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 [ 68.498944][ T8424] #1: ffff88801b0de5e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: virt_wifi_newlink+0x4cb/0x940 [ 68.508878][ T8424] [ 68.508878][ T8424] stack backtrace: [ 68.514742][ T8424] CPU: 1 PID: 8424 Comm: syz-executor.0 Not tainted 5.11.0-rc5-next-20210127-syzkaller #0 [ 68.524613][ T8424] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.534656][ T8424] Call Trace: [ 68.537933][ T8424] dump_stack+0x107/0x163 [ 68.542271][ T8424] __lock_acquire.cold+0x14c/0x3b4 [ 68.547369][ T8424] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.553342][ T8424] lock_acquire+0x1a8/0x720 [ 68.557826][ T8424] ? cfg80211_netdev_notifier_call+0x615/0x1180 [ 68.564053][ T8424] ? lock_release+0x710/0x710 [ 68.568711][ T8424] ? __lock_acquire+0x16b3/0x54c0 [ 68.573727][ T8424] __mutex_lock+0x134/0x1110 [ 68.578297][ T8424] ? cfg80211_netdev_notifier_call+0x615/0x1180 [ 68.584530][ T8424] ? cfg80211_netdev_notifier_call+0x615/0x1180 [ 68.590762][ T8424] ? mutex_lock_io_nested+0xf60/0xf60 [ 68.596302][ T8424] ? find_held_lock+0x2d/0x110 [ 68.601062][ T8424] ? __debug_object_init+0x409/0xd10 [ 68.606329][ T8424] ? mark_held_locks+0x9f/0xe0 [ 68.611247][ T8424] cfg80211_netdev_notifier_call+0x615/0x1180 [ 68.617300][ T8424] ? cfg80211_register_netdevice+0x2a0/0x2a0 [ 68.623262][ T8424] ? __devinet_sysctl_register+0x1ca/0x280 [ 68.629047][ T8424] ? debug_object_destroy+0x210/0x210 [ 68.634408][ T8424] ? lockdep_init_map_type+0x2c3/0x790 [ 68.639851][ T8424] ? lockdep_init_map_type+0x2c3/0x790 [ 68.645289][ T8424] ? add_grec+0x10e0/0x10e0 [ 68.649773][ T8424] ? __raw_spin_lock_init+0x36/0x110 [ 68.655055][ T8424] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.661453][ T8424] ? inetdev_init+0x2bb/0x4f0 [ 68.666114][ T8424] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.672337][ T8424] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 68.678569][ T8424] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 68.684789][ T8424] ? ipmr_device_event+0x1ab/0x220 [ 68.689877][ T8424] ? __sanitizer_cov_trace_switch+0x63/0xf0 [ 68.695783][ T8424] notifier_call_chain+0xb5/0x200 [ 68.700809][ T8424] call_netdevice_notifiers_info+0xb5/0x130 [ 68.706700][ T8424] register_netdevice+0x1034/0x14a0 [ 68.711879][ T8424] ? netdev_change_features+0xb0/0xb0 [ 68.717252][ T8424] ? kasan_unpoison+0x2c/0x50 [ 68.721923][ T8424] virt_wifi_newlink+0x4d3/0x940 [ 68.726841][ T8424] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 68.733071][ T8424] ? virt_wifi_rx_handler+0x320/0x320 [ 68.738425][ T8424] __rtnl_newlink+0x108b/0x16e0 [ 68.743261][ T8424] ? rtnl_setlink+0x3b0/0x3b0 [ 68.747925][ T8424] ? unwind_next_frame+0xe3b/0x1f90 [ 68.753117][ T8424] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.759174][ T8424] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 68.764879][ T8424] ? is_bpf_text_address+0xcb/0x160 [ 68.770082][ T8424] ? kernel_text_address+0xbd/0xf0 [ 68.775181][ T8424] ? __kernel_text_address+0x9/0x30 [ 68.780358][ T8424] ? unwind_get_return_address+0x51/0x90 [ 68.785967][ T8424] ? create_prof_cpu_mask+0x20/0x20 [ 68.791142][ T8424] ? arch_stack_walk+0x93/0xe0 [ 68.796003][ T8424] ? stack_trace_save+0x8c/0xc0 [ 68.800860][ T8424] ? rtnl_newlink+0x46/0xa0 [ 68.805343][ T8424] ? mark_held_locks+0x9f/0xe0 [ 68.810089][ T8424] ? kasan_unpoison+0x2c/0x50 [ 68.814746][ T8424] rtnl_newlink+0x64/0xa0 [ 68.819057][ T8424] ? __rtnl_newlink+0x16e0/0x16e0 [ 68.824065][ T8424] rtnetlink_rcv_msg+0x44e/0xad0 [ 68.828999][ T8424] ? rtnetlink_put_metrics+0x510/0x510 [ 68.834445][ T8424] netlink_rcv_skb+0x153/0x420 [ 68.839198][ T8424] ? rtnetlink_put_metrics+0x510/0x510 [ 68.844640][ T8424] ? netlink_ack+0xaa0/0xaa0 [ 68.849293][ T8424] ? netlink_deliver_tap+0x227/0xb70 [ 68.854572][ T8424] ? _copy_from_iter_full+0x2fa/0x1120 [ 68.860015][ T8424] netlink_unicast+0x533/0x7d0 [ 68.864770][ T8424] ? netlink_attachskb+0x870/0x870 [ 68.869882][ T8424] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 68.876116][ T8424] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 68.882333][ T8424] ? __phys_addr_symbol+0x2c/0x70 [ 68.887350][ T8424] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 68.893060][ T8424] ? __check_object_size+0x171/0x3f0 [ 68.898677][ T8424] netlink_sendmsg+0x856/0xd90 [ 68.903617][ T8424] ? netlink_unicast+0x7d0/0x7d0 [ 68.908533][ T8424] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.914755][ T8424] ? netlink_unicast+0x7d0/0x7d0 [ 68.919671][ T8424] sock_sendmsg+0xcf/0x120 [ 68.924080][ T8424] __sys_sendto+0x21c/0x320 [ 68.928591][ T8424] ? __ia32_sys_getpeername+0xb0/0xb0 [ 68.933943][ T8424] ? _raw_spin_unlock_irqrestore+0x2f/0x50 [ 68.939822][ T8424] ? debug_object_active_state+0x260/0x350 [ 68.945704][ T8424] ? kmem_cache_free+0x643/0x740 [ 68.950634][ T8424] ? blkcg_maybe_throttle_current+0x64d/0xd80 [ 68.956695][ T8424] ? __blkcg_punt_bio_submit+0x1d0/0x1d0 [ 68.962397][ T8424] __x64_sys_sendto+0xdd/0x1b0 [ 68.967144][ T8424] ? lockdep_hardirqs_on+0x79/0x100 [ 68.972324][ T8424] ? syscall_enter_from_user_mode+0x1d/0x50 [ 68.978201][ T8424] do_syscall_64+0x2d/0x70 [ 68.982597][ T8424] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.988469][ T8424] RIP: 0033:0x417c97 [ 68.992351][ T8424] Code: 2c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 81 19 00 00 c3 48 83 ec 08 e8 e7 fa ff ff 48 89 04 24 49 89 ca b8 2c 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 2d fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 69.011941][ T8424] RSP: 002b:00007ffd6adb9eb0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c [ 69.020337][ T8424] RAX: ffffffffffffffda RBX: 00000000016b4300 RCX: 0000000000417c97 [ 69.028288][ T8424] RDX: 000000000000004c RSI: 00000000016b4350 RDI: 0000000000000003 [ 69.036234][ T8424] RBP: 0000000000000000 R08: 00007ffd6adb9ec0 R09: 000000000000000c [ 69.044179][ T8424] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 [ 69.052129][ T8424] R13: 0000000000000000 R14: 00000000016b4350 R15: 0000000000000003 executing program [ 69.895733][ T8386] Bluetooth: hci0: command 0x0409 tx timeout [ 71.975634][ T3150] Bluetooth: hci0: command 0x041b tx timeout executing program [ 74.055526][ T3150] Bluetooth: hci0: command 0x040f tx timeout executing program [ 76.135458][ T3150] Bluetooth: hci0: command 0x0419 tx timeout