[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.249' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 52.030132][ T8467] [ 52.032838][ T8467] ============================= [ 52.037698][ T8467] WARNING: suspicious RCU usage [ 52.045650][ T8467] 5.10.0-syzkaller #0 Not tainted [ 52.050852][ T8467] ----------------------------- [ 52.056205][ T8467] net/wireless/reg.c:144 suspicious rcu_dereference_check() usage! [ 52.064222][ T8467] [ 52.064222][ T8467] other info that might help us debug this: [ 52.064222][ T8467] [ 52.074583][ T8467] [ 52.074583][ T8467] rcu_scheduler_active = 2, debug_locks = 1 [ 52.083970][ T8467] 2 locks held by syz-executor434/8467: [ 52.090156][ T8467] #0: ffffffff8cd0bd70 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 [ 52.099119][ T8467] #1: ffffffff8cd0bc28 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0xb1/0x1280 [ 52.108627][ T8467] [ 52.108627][ T8467] stack backtrace: [ 52.114681][ T8467] CPU: 1 PID: 8467 Comm: syz-executor434 Not tainted 5.10.0-syzkaller #0 [ 52.124476][ T8467] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.135010][ T8467] Call Trace: [ 52.138300][ T8467] dump_stack+0x137/0x1be [ 52.142630][ T8467] wiphy_apply_custom_regulatory+0x784/0x910 [ 52.148635][ T8467] mac80211_hwsim_new_radio+0x1eb3/0x3930 [ 52.154377][ T8467] hwsim_new_radio_nl+0xb07/0xf60 [ 52.159526][ T8467] genl_rcv_msg+0xe4e/0x1280 [ 52.164170][ T8467] ? hwsim_tx_info_frame_received_nl+0xe90/0xe90 [ 52.171433][ T8467] netlink_rcv_skb+0x190/0x3a0 [ 52.176194][ T8467] ? genl_rcv+0x40/0x40 [ 52.180696][ T8467] genl_rcv+0x24/0x40 [ 52.184669][ T8467] netlink_unicast+0x780/0x930 [ 52.189432][ T8467] netlink_sendmsg+0x9a8/0xd40 [ 52.194184][ T8467] ? netlink_getsockopt+0xa40/0xa40 [ 52.199365][ T8467] ____sys_sendmsg+0x519/0x800 [ 52.204117][ T8467] ? import_iovec+0xe6/0x120 [ 52.208716][ T8467] __sys_sendmsg+0x2bc/0x370 [ 52.213323][ T8467] ? syscall_enter_from_user_mode+0x24/0x190 [ 52.219288][ T8467] ? lockdep_hardirqs_on+0x8d/0x130 [ 52.224472][ T8467] ? syscall_enter_from_user_mode+0x24/0x190 [ 52.230435][ T8467] do_syscall_64+0x2d/0x70 [ 52.234846][ T8467] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.240716][ T8467] RIP: 0033:0x440309 [ 52.244636][ T8467] 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 [ 52.264331][ T8467] RSP: 002b:00007ffeafb01018 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 52.272906][ T8467] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 52.280898][ T8467] RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 [ 52.288863][ T8467] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 52.296930][ T8467] R10: 0000000000401ba0 R11: 0000000000000246 R12: 0000000000401b10 [ 52.304997][ T8467] R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000