Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.711271][ T8508] [ 69.713790][ T8508] ============================= [ 69.720810][ T8508] WARNING: suspicious RCU usage [ 69.725699][ T8508] 5.10.0-rc7-syzkaller #0 Not tainted [ 69.732035][ T8508] ----------------------------- [ 69.736966][ T8508] net/wireless/reg.c:144 suspicious rcu_dereference_check() usage! [ 69.745505][ T8508] [ 69.745505][ T8508] other info that might help us debug this: [ 69.745505][ T8508] [ 69.756128][ T8508] [ 69.756128][ T8508] rcu_scheduler_active = 2, debug_locks = 1 [ 69.764553][ T8508] 2 locks held by syz-executor756/8508: [ 69.770312][ T8508] #0: ffffffff8c9b59f0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 [ 69.778822][ T8508] #1: ffffffff8c9b5aa8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x3e0/0x580 [ 69.787834][ T8508] [ 69.787834][ T8508] stack backtrace: [ 69.793841][ T8508] CPU: 0 PID: 8508 Comm: syz-executor756 Not tainted 5.10.0-rc7-syzkaller #0 [ 69.802604][ T8508] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.812649][ T8508] Call Trace: [ 69.815933][ T8508] dump_stack+0x107/0x163 [ 69.820271][ T8508] get_wiphy_regdom+0xc3/0xd0 [ 69.825249][ T8508] wiphy_apply_custom_regulatory+0x234/0x360 [ 69.831249][ T8508] mac80211_hwsim_new_radio+0x1f45/0x4830 [ 69.836966][ T8508] ? hwsim_virtio_rx_work+0x350/0x350 [ 69.842357][ T8508] hwsim_new_radio_nl+0x9a6/0x10b0 [ 69.848613][ T8508] ? mac80211_hwsim_new_radio+0x4830/0x4830 [ 69.854524][ T8508] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x280 [ 69.861898][ T8508] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x280 [ 69.869200][ T8508] genl_family_rcv_msg_doit+0x228/0x320 [ 69.874750][ T8508] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x280/0x280 [ 69.882113][ T8508] ? ns_capable+0xde/0x100 [ 69.886514][ T8508] genl_rcv_msg+0x328/0x580 [ 69.891015][ T8508] ? genl_get_cmd+0x480/0x480 [ 69.895701][ T8508] ? mac80211_hwsim_new_radio+0x4830/0x4830 [ 69.901589][ T8508] ? lock_release+0x710/0x710 [ 69.906254][ T8508] netlink_rcv_skb+0x153/0x420 [ 69.911008][ T8508] ? genl_get_cmd+0x480/0x480 [ 69.915671][ T8508] ? netlink_ack+0xaa0/0xaa0 [ 69.920256][ T8508] genl_rcv+0x24/0x40 [ 69.924234][ T8508] netlink_unicast+0x533/0x7d0 [ 69.928990][ T8508] ? netlink_attachskb+0x810/0x810 [ 69.934096][ T8508] ? __phys_addr_symbol+0x2c/0x70 [ 69.939121][ T8508] ? __check_object_size+0x171/0x3f0 [ 69.944401][ T8508] netlink_sendmsg+0x856/0xd90 [ 69.949170][ T8508] ? netlink_unicast+0x7d0/0x7d0 [ 69.954109][ T8508] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 69.959378][ T8508] ? netlink_unicast+0x7d0/0x7d0 [ 69.964297][ T8508] sock_sendmsg+0xcf/0x120 [ 69.968720][ T8508] ____sys_sendmsg+0x6e8/0x810 [ 69.973481][ T8508] ? kernel_sendmsg+0x50/0x50 [ 69.978137][ T8508] ? do_recvmmsg+0x6c0/0x6c0 [ 69.982720][ T8508] ? find_held_lock+0x2d/0x110 [ 69.987487][ T8508] ___sys_sendmsg+0xf3/0x170 [ 69.992065][ T8508] ? sendmsg_copy_msghdr+0x160/0x160 [ 69.997356][ T8508] ? do_huge_pmd_anonymous_page+0x8f1/0x2170 [ 70.003869][ T8508] ? find_held_lock+0x2d/0x110 [ 70.008633][ T8508] ? __fget_light+0x215/0x280 [ 70.013309][ T8508] __sys_sendmsg+0xe5/0x1b0 [ 70.017796][ T8508] ? __sys_sendmsg_sock+0xb0/0xb0 [ 70.022827][ T8508] ? syscall_enter_from_user_mode+0x1d/0x50 [ 70.028737][ T8508] do_syscall_64+0x2d/0x70 [ 70.033161][ T8508] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 70.039042][ T8508] RIP: 0033:0x440309 [ 70.042930][ T8508] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 70.062544][ T8508] RSP: 002b:00007ffe6ce842f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 70.070952][ T8508] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 70.078915][ T8508] RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 [ 70.086888][ T8508] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 70.094868][ T8508] R10: 0000000000401ba0 R11: 0000000000000246 R12: 0000000000401b10 [ 70.103118][ T8508] R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000