linux-kernel - Re: [syzbot] [wireless?] WARNING in ieee80211_prep

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Message-ID: <67e1a26f.050a0220.a7ebc.002b.GAE@google.com>
Date: Mon, 24 Mar 2025 11:20:31 -0700
From: syzbot <syzbot+c90039fcfb40175abe28@...kaller.appspotmail.com>
To: johannes@...solutions.net, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] WARNING in ieee80211_prep_channel

syzbot has found a reproducer for the following issue on:

HEAD commit:    38fec10eb60d Linux 6.14
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=114c8198580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d0b5b6b74098b0ef
dashboard link: https://syzkaller.appspot.com/bug?extid=c90039fcfb40175abe28
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d8a43f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12afbc4c580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-38fec10e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d34e40d2aad1/vmlinux-38fec10e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e290e3747399/bzImage-38fec10e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c90039fcfb40175abe28@...kaller.appspotmail.com

mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
wlan1: No basic rates, using min rate instead
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5313 at net/mac80211/mlme.c:1012 ieee80211_determine_chan_mode net/mac80211/mlme.c:1012 [inline]
WARNING: CPU: 0 PID: 5313 at net/mac80211/mlme.c:1012 ieee80211_prep_channel+0x389b/0x5120 net/mac80211/mlme.c:5667
Modules linked in:
CPU: 0 UID: 0 PID: 5313 Comm: syz-executor339 Not tainted 6.14.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ieee80211_determine_chan_mode net/mac80211/mlme.c:1012 [inline]
RIP: 0010:ieee80211_prep_channel+0x389b/0x5120 net/mac80211/mlme.c:5667
Code: c6 05 4f cd 94 04 01 48 c7 c7 37 3b 4b 8d be 78 03 00 00 48 c7 c2 a0 3c 4b 8d e8 70 00 0b f6 e9 7e ca ff ff e8 16 a6 2f f6 90 <0f> 0b 90 48 8b 7c 24 30 e8 e8 5c 8b f6 48 c7 44 24 30 ea ff ff ff
RSP: 0018:ffffc9000d086500 EFLAGS: 00010293
RAX: ffffffff8b9239ba RBX: 0000000000000000 RCX: ffff888000280000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000d086850 R08: ffffffff8b920ed9 R09: ffffffff8b60cbf9
R10: 000000000000000e R11: ffff888000280000 R12: dffffc0000000000
R13: ffff888044136758 R14: ffffc9000d086710 R15: ffffc9000d086750
FS:  00007fab44b026c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab44b01198 CR3: 0000000043c60000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ieee80211_prep_connection+0xda1/0x1310 net/mac80211/mlme.c:8539
 ieee80211_mgd_auth+0xedb/0x1750 net/mac80211/mlme.c:8829
 rdev_auth net/wireless/rdev-ops.h:486 [inline]
 cfg80211_mlme_auth+0x59f/0x970 net/wireless/mlme.c:291
 cfg80211_conn_do_work+0x601/0xeb0 net/wireless/sme.c:183
 cfg80211_sme_connect net/wireless/sme.c:626 [inline]
 cfg80211_connect+0x190a/0x22f0 net/wireless/sme.c:1525
 nl80211_connect+0x19ec/0x2140 net/wireless/nl80211.c:12242
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xb1f/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2533
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1882
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 ____sys_sendmsg+0x53a/0x860 net/socket.c:2573
 ___sys_sendmsg net/socket.c:2627 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2659
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fab44b48de9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 00 00 90 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fab44b02218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fab44bd2368 RCX: 00007fab44b48de9
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000003
RBP: 00007fab44bd2360 R08: 0000000000000034 R09: 0000000000000000
R10: 000000000000000a R11: 0000000000000246 R12: 00007fab44b9f294
R13: 0000200000000200 R14: 00002000000001d0 R15: 00002000000001c0
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.