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Date:   Sat, 19 Dec 2020 18:24:09 -0800
From:   syzbot <>
Subject: WARNING: suspicious RCU usage in wiphy_apply_custom_regulatory


syzbot found the following issue on:

HEAD commit:    d635a69d Merge tag 'net-next-5.11' of git://
git tree:       upstream
console output:
kernel config:
dashboard link:
compiler:       clang version 11.0.0 ( ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
syz repro:
C reproducer:

The issue was bisected to:

commit beee246951571cc5452176f3dbfe9aa5a10ba2b9
Author: Ilan Peer <>
Date:   Sun Nov 29 15:30:51 2020 +0000

    cfg80211: Save the regulatory domain when setting custom regulatory

bisection log:
final oops:
console output:

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Fixes: beee24695157 ("cfg80211: Save the regulatory domain when setting custom regulatory")

WARNING: suspicious RCU usage
5.10.0-syzkaller #0 Not tainted
net/wireless/reg.c:144 suspicious rcu_dereference_check() usage!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
2 locks held by syz-executor434/8467:
 #0: ffffffff8cd0bd70 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:810
 #1: ffffffff8cd0bc28 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
 #1: ffffffff8cd0bc28 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0xb1/0x1280 net/netlink/genetlink.c:798

stack backtrace:
CPU: 1 PID: 8467 Comm: syz-executor434 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x137/0x1be lib/dump_stack.c:120
 get_wiphy_regdom net/wireless/reg.c:144 [inline]
 wiphy_apply_custom_regulatory+0x784/0x910 net/wireless/reg.c:2574
 mac80211_hwsim_new_radio+0x1eb3/0x3930 drivers/net/wireless/mac80211_hwsim.c:3247
 hwsim_new_radio_nl+0xb07/0xf60 drivers/net/wireless/mac80211_hwsim.c:3822
 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0xe4e/0x1280 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2494
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x780/0x930 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x9a8/0xd40 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x519/0x800 net/socket.c:2336
 ___sys_sendmsg net/socket.c:2390 [inline]
 __sys_sendmsg+0x2bc/0x370 net/socket.c:2423
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
RIP: 0033:0x440309
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
RSP: 002b:00007ffeafb01018 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000401ba0 R11: 0000000000000246 R12: 0000000000401b10
R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000

This report is generated by a bot. It may contain errors.
See for more information about syzbot.
syzbot engineers can be reached at

syzbot will keep track of this issue. See: for how to communicate with syzbot.
For information about bisection process see:
syzbot can test patches for this issue, for details see:

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