[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. 2021/01/27 15:18:29 fuzzer started 2021/01/27 15:18:29 connecting to host at 10.128.0.26:39415 2021/01/27 15:18:29 checking machine... 2021/01/27 15:18:29 checking revisions... 2021/01/27 15:18:29 testing simple program... syzkaller login: [ 68.494088][ T8434] IPVS: ftp: loaded support on port[0] = 21 [ 68.660125][ T8434] chnl_net:caif_netlink_parms(): no params data found [ 68.715536][ T8434] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.724027][ T8434] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.733866][ T8434] device bridge_slave_0 entered promiscuous mode [ 68.743269][ T8434] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.751755][ T8434] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.760006][ T8434] device bridge_slave_1 entered promiscuous mode [ 68.780897][ T8434] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 68.792548][ T8434] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 68.816590][ T8434] team0: Port device team_slave_0 added [ 68.824129][ T8434] team0: Port device team_slave_1 added [ 68.842832][ T8434] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 68.850246][ T8434] 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. [ 68.876911][ T8434] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 68.890690][ T8434] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 68.897656][ T8434] 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. [ 68.924412][ T8434] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 68.951156][ T8434] device hsr_slave_0 entered promiscuous mode [ 68.957810][ T8434] device hsr_slave_1 entered promiscuous mode [ 68.975683][ T8434] [ 68.978043][ T8434] ============================================ [ 68.984258][ T8434] WARNING: possible recursive locking detected [ 68.990569][ T8434] 5.11.0-rc5-next-20210127-syzkaller #0 Not tainted [ 68.997222][ T8434] -------------------------------------------- [ 69.003350][ T8434] syz-executor.0/8434 is trying to acquire lock: [ 69.009657][ T8434] ffff88801ac7a5e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_netdev_notifier_call+0x615/0x1180 [ 69.020260][ T8434] [ 69.020260][ T8434] but task is already holding lock: [ 69.027663][ T8434] ffff88801ac7a5e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: virt_wifi_newlink+0x4cb/0x940 [ 69.037117][ T8434] [ 69.037117][ T8434] other info that might help us debug this: [ 69.045337][ T8434] Possible unsafe locking scenario: [ 69.045337][ T8434] [ 69.052847][ T8434] CPU0 [ 69.056104][ T8434] ---- [ 69.059357][ T8434] lock(&rdev->wiphy.mtx); [ 69.063835][ T8434] lock(&rdev->wiphy.mtx); [ 69.068450][ T8434] [ 69.068450][ T8434] *** DEADLOCK *** [ 69.068450][ T8434] [ 69.076580][ T8434] May be due to missing lock nesting notation [ 69.076580][ T8434] [ 69.084892][ T8434] 2 locks held by syz-executor.0/8434: [ 69.090440][ T8434] #0: ffffffff8cc71b08 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 [ 69.099825][ T8434] #1: ffff88801ac7a5e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: virt_wifi_newlink+0x4cb/0x940 [ 69.110150][ T8434] [ 69.110150][ T8434] stack backtrace: [ 69.116017][ T8434] CPU: 1 PID: 8434 Comm: syz-executor.0 Not tainted 5.11.0-rc5-next-20210127-syzkaller #0 [ 69.126059][ T8434] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.136221][ T8434] Call Trace: [ 69.139554][ T8434] dump_stack+0x107/0x163 [ 69.143886][ T8434] __lock_acquire.cold+0x14c/0x3b4 [ 69.148986][ T8434] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 69.155105][ T8434] lock_acquire+0x1a8/0x720 [ 69.159595][ T8434] ? cfg80211_netdev_notifier_call+0x615/0x1180 [ 69.165819][ T8434] ? lock_release+0x710/0x710 [ 69.170480][ T8434] ? __lock_acquire+0x16b3/0x54c0 [ 69.175485][ T8434] __mutex_lock+0x134/0x1110 [ 69.180060][ T8434] ? cfg80211_netdev_notifier_call+0x615/0x1180 [ 69.186717][ T8434] ? cfg80211_netdev_notifier_call+0x615/0x1180 [ 69.192942][ T8434] ? mutex_lock_io_nested+0xf60/0xf60 [ 69.198305][ T8434] ? find_held_lock+0x2d/0x110 [ 69.203074][ T8434] ? __debug_object_init+0x409/0xd10 [ 69.208339][ T8434] ? mark_held_locks+0x9f/0xe0 [ 69.213084][ T8434] cfg80211_netdev_notifier_call+0x615/0x1180 [ 69.219480][ T8434] ? cfg80211_register_netdevice+0x2a0/0x2a0 [ 69.225443][ T8434] ? __devinet_sysctl_register+0x1ca/0x280 [ 69.231229][ T8434] ? debug_object_destroy+0x210/0x210 [ 69.236680][ T8434] ? lockdep_init_map_type+0x2c3/0x790 [ 69.242139][ T8434] ? lockdep_init_map_type+0x2c3/0x790 [ 69.247592][ T8434] ? add_grec+0x10e0/0x10e0 [ 69.252080][ T8434] ? __raw_spin_lock_init+0x36/0x110 [ 69.257347][ T8434] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.263569][ T8434] ? inetdev_init+0x2bb/0x4f0 [ 69.268239][ T8434] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.274472][ T8434] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 69.280704][ T8434] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 69.287018][ T8434] ? ipmr_device_event+0x1ab/0x220 [ 69.292106][ T8434] ? __sanitizer_cov_trace_switch+0x63/0xf0 [ 69.298000][ T8434] notifier_call_chain+0xb5/0x200 [ 69.303027][ T8434] call_netdevice_notifiers_info+0xb5/0x130 [ 69.308905][ T8434] register_netdevice+0x1034/0x14a0 [ 69.314085][ T8434] ? netdev_change_features+0xb0/0xb0 [ 69.319437][ T8434] ? kasan_unpoison+0x2c/0x50 [ 69.324097][ T8434] virt_wifi_newlink+0x4d3/0x940 [ 69.329025][ T8434] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 69.335268][ T8434] ? virt_wifi_rx_handler+0x320/0x320 [ 69.340661][ T8434] __rtnl_newlink+0x108b/0x16e0 [ 69.345524][ T8434] ? rtnl_setlink+0x3b0/0x3b0 [ 69.350282][ T8434] ? unwind_next_frame+0xe3b/0x1f90 [ 69.355517][ T8434] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.361618][ T8434] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 69.367446][ T8434] ? is_bpf_text_address+0xcb/0x160 [ 69.372630][ T8434] ? kernel_text_address+0xbd/0xf0 [ 69.377724][ T8434] ? __kernel_text_address+0x9/0x30 [ 69.383005][ T8434] ? unwind_get_return_address+0x51/0x90 [ 69.388644][ T8434] ? create_prof_cpu_mask+0x20/0x20 [ 69.393850][ T8434] ? arch_stack_walk+0x93/0xe0 [ 69.398602][ T8434] ? stack_trace_save+0x8c/0xc0 [ 69.403444][ T8434] ? fs_reclaim_release+0x9c/0xe0 [ 69.408462][ T8434] ? kasan_unpoison+0x2c/0x50 [ 69.413144][ T8434] rtnl_newlink+0x64/0xa0 [ 69.417474][ T8434] ? __rtnl_newlink+0x16e0/0x16e0 [ 69.422496][ T8434] rtnetlink_rcv_msg+0x44e/0xad0 [ 69.427426][ T8434] ? rtnetlink_put_metrics+0x510/0x510 [ 69.432896][ T8434] netlink_rcv_skb+0x153/0x420 [ 69.437644][ T8434] ? rtnetlink_put_metrics+0x510/0x510 [ 69.443090][ T8434] ? netlink_ack+0xaa0/0xaa0 [ 69.447703][ T8434] ? netlink_deliver_tap+0x227/0xb70 [ 69.453036][ T8434] ? _copy_from_iter_full+0x2fa/0x1120 [ 69.458485][ T8434] netlink_unicast+0x533/0x7d0 [ 69.463241][ T8434] ? netlink_attachskb+0x870/0x870 [ 69.468335][ T8434] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 69.474616][ T8434] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 69.480967][ T8434] ? __phys_addr_symbol+0x2c/0x70 [ 69.485981][ T8434] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 69.491803][ T8434] ? __check_object_size+0x171/0x3f0 [ 69.497076][ T8434] netlink_sendmsg+0x856/0xd90 [ 69.501824][ T8434] ? netlink_unicast+0x7d0/0x7d0 [ 69.506744][ T8434] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.512986][ T8434] ? netlink_unicast+0x7d0/0x7d0 [ 69.517902][ T8434] sock_sendmsg+0xcf/0x120 [ 69.522315][ T8434] __sys_sendto+0x21c/0x320 [ 69.526799][ T8434] ? __ia32_sys_getpeername+0xb0/0xb0 [ 69.532166][ T8434] ? _raw_spin_unlock_irqrestore+0x2f/0x50 [ 69.537968][ T8434] ? debug_object_active_state+0x260/0x350 [ 69.543763][ T8434] ? kmem_cache_free+0x643/0x740 [ 69.548682][ T8434] ? blkcg_maybe_throttle_current+0x64d/0xd80 [ 69.554730][ T8434] ? __blkcg_punt_bio_submit+0x1d0/0x1d0 [ 69.560457][ T8434] __x64_sys_sendto+0xdd/0x1b0 [ 69.565207][ T8434] ? lockdep_hardirqs_on+0x79/0x100 [ 69.570389][ T8434] ? syscall_enter_from_user_mode+0x1d/0x50 [ 69.576402][ T8434] do_syscall_64+0x2d/0x70 [ 69.580804][ T8434] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.586700][ T8434] RIP: 0033:0x417c97 [ 69.590838][ T8434] 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 [ 69.610425][ T8434] RSP: 002b:00007ffcdc5a8540 EFLAGS: 00000293 ORIG_RAX: 000000000000002c [ 69.618822][ T8434] RAX: ffffffffffffffda RBX: 00000000016b4300 RCX: 0000000000417c97 [ 69.626769][ T8434] RDX: 000000000000004c RSI: 00000000016b4350 RDI: 0000000000000003 [ 69.634827][ T8434] RBP: 0000000000000000 R08: 00007ffcdc5a8550 R09: 000000000000000c [ 69.642778][ T8434] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 [ 69.650792][ T8434] R13: 0000000000000000 R14: 00000000016b4350 R15: 0000000000000003 executing program [ 70.478234][ T2945] Bluetooth: hci0: command 0x0409 tx timeout [ 72.557990][ T2945] Bluetooth: hci0: command 0x041b tx timeout executing program [ 74.637848][ T2945] Bluetooth: hci0: command 0x040f tx timeout executing program [ 76.717657][ T2945] Bluetooth: hci0: command 0x0419 tx timeout executing program