Message-ID: <6912607e.a70a0220.22f260.010f.GAE@google.com>
Date: Mon, 10 Nov 2025 14:00:30 -0800
From: syzbot <syzbot+e785ad5c3cc8ca31eeac@...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: [syzbot] [wireless?] WARNING in _ieee80211_change_chanctx (2)

Hello,

syzbot found the following issue on:

HEAD commit:    dcb6fa37fd7b Linux 6.18-rc3
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=14e07812580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b8b659f0cab27b22
dashboard link: https://syzkaller.appspot.com/bug?extid=e785ad5c3cc8ca31eeac
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ae6bec0d0398/disk-dcb6fa37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dcc732da66c3/vmlinux-dcb6fa37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/301d1bbdecc2/Image-dcb6fa37.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e785ad5c3cc8ca31eeac@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 17489 at net/mac80211/chan.c:544 _ieee80211_change_chanctx+0x25c/0x10f4 net/mac80211/chan.c:544
Modules linked in:
CPU: 0 UID: 0 PID: 17489 Comm: syz.1.3194 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : _ieee80211_change_chanctx+0x25c/0x10f4 net/mac80211/chan.c:544
lr : _ieee80211_change_chanctx+0x25c/0x10f4 net/mac80211/chan.c:544
sp : ffff8000991c67c0
x29: ffff8000991c68e0 x28: 0000000000000006 x27: dfff800000000000
x26: 0000000000000006 x25: ffff0000f6909800 x24: ffff8000991c69c0
x23: ffff0000f69098b0 x22: ffff0000d52b3398 x21: 0000000000000000
x20: ffff0000f6909800 x19: ffff0000d52b0e80 x18: 0000000000000000
x17: 0000000000000000 x16: ffff80008052a444 x15: 0000000000000005
x14: 0000000000000002 x13: 000000000000000d x12: 0000000000ff0100
x11: 0000000000080000 x10: 0000000000003423 x9 : ffff8000a5ddb000
x8 : 0000000000003424 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff8000991c6a10 x4 : 0000000000000000 x3 : ffff8000991c69c0
x2 : ffff0000f6909800 x1 : ffff800092ae0f10 x0 : 0000000000000006
Call trace:
 _ieee80211_change_chanctx+0x25c/0x10f4 net/mac80211/chan.c:544 (P)
 ieee80211_change_chanctx net/mac80211/chan.c:590 [inline]
 ieee80211_recalc_chanctx_chantype+0xcec/0xdf4 net/mac80211/chan.c:865
 ieee80211_vif_use_reserved_switch+0x1470/0x22b0 net/mac80211/chan.c:1763
 ieee80211_link_use_reserved_context+0x2e8/0x4ec net/mac80211/chan.c:2017
 __ieee80211_csa_finalize net/mac80211/cfg.c:4114 [inline]
 ieee80211_csa_finalize+0x464/0xf08 net/mac80211/cfg.c:4145
 __ieee80211_channel_switch net/mac80211/cfg.c:4424 [inline]
 ieee80211_channel_switch+0x834/0xa40 net/mac80211/cfg.c:4439
 rdev_channel_switch+0x124/0x300 net/wireless/rdev-ops.h:1116
 nl80211_channel_switch+0x8d8/0xb18 net/wireless/nl80211.c:11476
 genl_family_rcv_msg_doit+0x1d8/0x2bc net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x450/0x624 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x220/0x3fc net/netlink/af_netlink.c:2552
 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x694/0x8c4 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x648/0x930 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0x490/0x7b8 net/socket.c:2630
 ___sys_sendmsg+0x204/0x278 net/socket.c:2684
 __sys_sendmsg net/socket.c:2716 [inline]
 __do_sys_sendmsg net/socket.c:2721 [inline]
 __se_sys_sendmsg net/socket.c:2719 [inline]
 __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2719
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 772
hardirqs last  enabled at (771): [<ffff800080c84b38>] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234
hardirqs last disabled at (772): [<ffff80008adecb80>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434
softirqs last  enabled at (732): [<ffff8000803d8488>] softirq_handle_end kernel/softirq.c:468 [inline]
softirqs last  enabled at (732): [<ffff8000803d8488>] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:650
softirqs last disabled at (693): [<ffff800080022024>] __do_softirq+0x14/0x20 kernel/softirq.c:656
---[ end trace 0000000000000000 ]---


---
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