WARNING in ieee80211_do_stop

Status: upstream: reported on 2026/09/13 18:40
Reported-by: syzbot+66b01a29a6b06bd64cd2@syzkaller.appspotmail.com
First crash: 3d23h, last: 3d23h
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in ieee80211_do_stop wireless -1 1 1524d 1520d 0/29 auto-obsoleted due to no activity on 2022/09/13 22:46
linux-6.1 WARNING in ieee80211_do_stop -1 1 5d11h 5d11h 0/3 upstream: reported on 2026/09/12 06:32
upstream WARNING in ieee80211_do_stop (2) wireless -1 5 794d 798d 0/29 auto-obsoleted due to no activity on 2024/10/22 18:25
upstream WARNING in ieee80211_do_stop (3) wireless -1 6 247d 389d 0/29 auto-obsoleted due to no activity on 2026/04/23 01:51

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7791 at net/mac80211/iface.c:530 ieee80211_do_stop+0x1ac8/0x2000 net/mac80211/iface.c:530
Modules linked in:
CPU: 1 PID: 7791 Comm: kworker/u4:25 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_do_stop+0x1ac8/0x2000 net/mac80211/iface.c:530
Code: f7 49 81 c5 d8 06 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 e0 04 00 00 41 ff 4d 00 e9 ed f5 ff ff e8 98 b7 82 f7 <0f> 0b e9 d0 e8 ff ff e8 8c b7 82 f7 43 0f b6 04 27 84 c0 0f 85 f5
RSP: 0018:ffffc9001087f380 EFLAGS: 00010293
RAX: ffffffff8a04cad8 RBX: 0000000000000001 RCX: ffff88802bfe3c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9001087f568 R08: ffffc9001087f227 R09: 1ffff9200210fe44
R10: dffffc0000000000 R11: fffff5200210fe45 R12: dffffc0000000000
R13: ffffc9001087f4d0 R14: 0000000000000001 R15: ffff88805cd56930
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cda5c3c950 CR3: 000000004ca6e000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 ieee80211_stop+0x423/0x490 net/mac80211/iface.c:813
 __dev_close_many+0x1d5/0x2b0 net/core/dev.c:1603
 dev_close_many+0x220/0x410 net/core/dev.c:1628
 dev_close+0x158/0x210 net/core/dev.c:1654
 cfg80211_shutdown_all_interfaces+0xaf/0x1c0 net/wireless/core.c:280
 ieee80211_remove_interfaces+0x114/0x690 net/mac80211/iface.c:2339
 ieee80211_unregister_hw+0x5d/0x2a0 net/mac80211/main.c:1518
 mac80211_hwsim_del_radio+0x289/0x480 drivers/net/wireless/virtual/mac80211_hwsim.c:5412
 hwsim_exit_net+0x58d/0x650 drivers/net/wireless/virtual/mac80211_hwsim.c:6290
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x707/0xbb0 net/core/net_namespace.c:652
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/13 18:39 linux-6.6.y 8b73de7da85f 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_do_stop
* Struck through repros no longer work on HEAD.