[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.488986][ T8471] [ 63.491563][ T8471] ============================= [ 63.496420][ T8471] WARNING: suspicious RCU usage [ 63.503547][ T8471] 5.10.0-rc7-syzkaller #0 Not tainted [ 63.508927][ T8471] ----------------------------- [ 63.514035][ T8471] net/wireless/reg.c:144 suspicious rcu_dereference_check() usage! [ 63.522399][ T8471] [ 63.522399][ T8471] other info that might help us debug this: [ 63.522399][ T8471] [ 63.533279][ T8471] [ 63.533279][ T8471] rcu_scheduler_active = 2, debug_locks = 1 [ 63.541520][ T8471] 2 locks held by syz-executor217/8471: [ 63.547056][ T8471] #0: ffffffff8c9b5230 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 [ 63.555293][ T8471] #1: ffffffff8c9b52e8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x3e0/0x580 [ 63.564360][ T8471] [ 63.564360][ T8471] stack backtrace: [ 63.570315][ T8471] CPU: 0 PID: 8471 Comm: syz-executor217 Not tainted 5.10.0-rc7-syzkaller #0 [ 63.579086][ T8471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.589120][ T8471] Call Trace: [ 63.592410][ T8471] dump_stack+0x107/0x163 [ 63.597163][ T8471] get_wiphy_regdom+0xc3/0xd0 [ 63.601829][ T8471] wiphy_apply_custom_regulatory+0x234/0x360 [ 63.607817][ T8471] mac80211_hwsim_new_radio+0x1f45/0x4830 [ 63.613531][ T8471] ? hwsim_virtio_rx_work+0x350/0x350 [ 63.618887][ T8471] hwsim_new_radio_nl+0x9a6/0x10b0 [ 63.623981][ T8471] ? mac80211_hwsim_new_radio+0x4830/0x4830 [ 63.629864][ T8471] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x1b7/0x280 [ 63.637213][ T8471] ? genl_family_rcv_msg_attrs_parse.constprop.0+0xaf/0x280 [ 63.644480][ T8471] genl_family_rcv_msg_doit+0x228/0x320 [ 63.650012][ T8471] ? genl_family_rcv_msg_attrs_parse.constprop.0+0x280/0x280 [ 63.657383][ T8471] ? ns_capable+0xde/0x100 [ 63.661784][ T8471] genl_rcv_msg+0x328/0x580 [ 63.666274][ T8471] ? genl_get_cmd+0x480/0x480 [ 63.670932][ T8471] ? mac80211_hwsim_new_radio+0x4830/0x4830 [ 63.676913][ T8471] ? lock_release+0x710/0x710 [ 63.681576][ T8471] netlink_rcv_skb+0x153/0x420 [ 63.686320][ T8471] ? genl_get_cmd+0x480/0x480 [ 63.690980][ T8471] ? netlink_ack+0xaa0/0xaa0 [ 63.695572][ T8471] genl_rcv+0x24/0x40 [ 63.699532][ T8471] netlink_unicast+0x533/0x7d0 [ 63.704279][ T8471] ? netlink_attachskb+0x810/0x810 [ 63.709369][ T8471] ? __phys_addr_symbol+0x2c/0x70 [ 63.714372][ T8471] ? __check_object_size+0x171/0x3f0 [ 63.719637][ T8471] netlink_sendmsg+0x856/0xd90 [ 63.724398][ T8471] ? netlink_unicast+0x7d0/0x7d0 [ 63.729340][ T8471] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 63.734602][ T8471] ? netlink_unicast+0x7d0/0x7d0 [ 63.739529][ T8471] sock_sendmsg+0xcf/0x120 [ 63.744285][ T8471] ____sys_sendmsg+0x6e8/0x810 [ 63.749044][ T8471] ? kernel_sendmsg+0x50/0x50 [ 63.753699][ T8471] ? do_recvmmsg+0x6c0/0x6c0 [ 63.758292][ T8471] ? find_held_lock+0x2d/0x110 [ 63.763037][ T8471] ___sys_sendmsg+0xf3/0x170 [ 63.767606][ T8471] ? sendmsg_copy_msghdr+0x160/0x160 [ 63.772875][ T8471] ? do_huge_pmd_anonymous_page+0x8f1/0x2170 [ 63.778840][ T8471] ? find_held_lock+0x2d/0x110 [ 63.783583][ T8471] ? __fget_light+0x215/0x280 [ 63.788247][ T8471] __sys_sendmsg+0xe5/0x1b0 [ 63.792737][ T8471] ? __sys_sendmsg_sock+0xb0/0xb0 [ 63.797756][ T8471] ? syscall_enter_from_user_mode+0x1d/0x50 [ 63.803628][ T8471] do_syscall_64+0x2d/0x70 [ 63.808021][ T8471] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.813889][ T8471] RIP: 0033:0x440309 [ 63.817762][ T8471] 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 [ 63.837345][ T8471] RSP: 002b:00007fff9be21ed8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 63.845742][ T8471] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 63.853707][ T8471] RDX: 0000000004000010 RSI: 00000000200001c0 RDI: 0000000000000003 [ 63.861671][ T8471] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 63.869619][ T8471] R10: 0000000000401ba0 R11: 0000000000000246 R12: 0000000000401b10 [ 63.877580][ T8471] R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000