linux-kernel - [syzbot] [wireless?] WARNING in ieee80211_recalc_chanctx

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Message-ID: <68947327.050a0220.7f033.0042.GAE@google.com>
Date: Thu, 07 Aug 2025 02:34:31 -0700
From: syzbot <syzbot+3e1ddd8aa744da8bec01@...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_recalc_chanctx_chantype

Hello,

syzbot found the following issue on:

HEAD commit:    7e161a991ea7 Merge tag 'i2c-for-6.17-rc1-part2' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1489c434580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=62d04834ef6637ed
dashboard link: https://syzkaller.appspot.com/bug?extid=3e1ddd8aa744da8bec01
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3e5f109fb8fc/disk-7e161a99.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/051cd2ea2369/vmlinux-7e161a99.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f4d2819ae9d5/bzImage-7e161a99.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3e1ddd8aa744da8bec01@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 6016 at net/mac80211/chan.c:844 ieee80211_recalc_chanctx_chantype+0x7a7/0xae0 net/mac80211/chan.c:844
Modules linked in:
CPU: 1 UID: 0 PID: 6016 Comm: kworker/u8:3 Not tainted 6.16.0-syzkaller-11699-g7e161a991ea7 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_recalc_chanctx_chantype+0x7a7/0xae0 net/mac80211/chan.c:844
Code: 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02 00 0f 84 6f f9 ff ff 4c 89 ff e8 14 60 0c f7 e9 62 f9 ff ff e8 8a 08 a7 f6 90 <0f> 0b 90 e9 18 fc ff ff e8 7c 08 a7 f6 49 8d bd a0 09 00 00 48 b8
RSP: 0018:ffffc900047c7098 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 000000000000000f RCX: ffffffff8b1484e2
RDX: ffff888030da5a00 RSI: ffffffff8b1489d6 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000005 R09: 000000000000000f
R10: 000000000000000f R11: 0000000000000000 R12: 1ffff920008f8e1c
R13: 0000000000000000 R14: ffff88805288a8c0 R15: 0000000000000007
FS:  0000000000000000(0000) GS:ffff8881247c7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000008000 CR3: 000000000e380000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ieee80211_assign_link_chanctx+0xb90/0xf00 net/mac80211/chan.c:944
 __ieee80211_link_release_channel+0x273/0x4b0 net/mac80211/chan.c:1890
 ieee80211_link_release_channel+0x128/0x200 net/mac80211/chan.c:2165
 ieee80211_leave_mesh+0x71/0x150 net/mac80211/cfg.c:2842
 rdev_leave_mesh net/wireless/rdev-ops.h:372 [inline]
 cfg80211_leave_mesh+0x23e/0x900 net/wireless/mesh.c:277
 cfg80211_leave+0x26a/0x3f0 net/wireless/core.c:1383
 cfg80211_netdev_notifier_call+0x2c1/0x1120 net/wireless/core.c:1567
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 __dev_close_many+0xff/0x770 net/core/dev.c:1726
 netif_close_many+0x233/0x630 net/core/dev.c:1780
 netif_close net/core/dev.c:1797 [inline]
 netif_close+0x17f/0x230 net/core/dev.c:1791
 dev_close+0xaa/0x240 net/core/dev_api.c:220
 cfg80211_shutdown_all_interfaces+0x9a/0x220 net/wireless/core.c:277
 ieee80211_remove_interfaces+0xc3/0x740 net/mac80211/iface.c:2364
 ieee80211_unregister_hw+0x55/0x3a0 net/mac80211/main.c:1664
 mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim.c:5674 [inline]
 hwsim_exit_net+0x3ac/0x7d0 drivers/net/wireless/virtual/mac80211_hwsim.c:6554
 ops_exit_list net/core/net_namespace.c:198 [inline]
 ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:251
 cleanup_net+0x408/0x890 net/core/net_namespace.c:682
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
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