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WARNING in ieee80211_link_release_channel

Status: upstream: reported on 2025/08/04 22:09
Reported-by: syzbot+47350a473be99ab8cff7@syzkaller.appspotmail.com
First crash: 17d, last: 2d16h
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in ieee80211_link_release_channel wireless -1 syz done done 3 679d 719d 0/29 auto-obsoleted due to no activity on 2024/01/21 00:13
linux-6.1 WARNING in ieee80211_link_release_channel -1 17 15h28m 20d 0/3 upstream: reported on 2025/08/02 09:20

Sample crash report:
: (slave wlan1): Releasing backup interface
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1317 at net/mac80211/chan.c:2021 ieee80211_link_release_channel+0x154/0x180 net/mac80211/chan.c:2021
Modules linked in:
CPU: 0 PID: 1317 Comm: kworker/u4:6 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:ieee80211_link_release_channel+0x154/0x180 net/mac80211/chan.c:2021
Code: 7c 2d 00 00 74 08 48 89 df e8 58 94 ea f7 bf 60 1e 00 00 48 03 3b 5b 41 5c 41 5d 41 5e 41 5f 5d e9 21 9f 83 00 e8 0c 4d 93 f7 <0f> 0b eb c5 48 c7 c1 dc bc 4a 8e 80 e1 07 80 c1 03 38 c1 0f 8c 51
RSP: 0018:ffffc900049ef548 EFLAGS: 00010293
RAX: ffffffff89f23e14 RBX: ffff88805c051598 RCX: ffff8880244cda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8e4a882f R09: 1ffffffff1c95105
R10: dffffc0000000000 R11: fffffbfff1c95106 R12: ffff88805c052c08
R13: 1ffff1100b80a2b3 R14: ffff88805c0523c0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc7b8b4c000 CR3: 00000000314d6000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 unregister_netdevice_many_notify+0x1257/0x1810 net/core/dev.c:11094
 unregister_netdevice_many net/core/dev.c:11130 [inline]
 unregister_netdevice_queue+0x324/0x360 net/core/dev.c:11010
 unregister_netdevice include/linux/netdevice.h:3137 [inline]
 _cfg80211_unregister_wdev+0x16b/0x580 net/wireless/core.c:1215
 ieee80211_remove_interfaces+0x496/0x680 net/mac80211/iface.c:2351
 ieee80211_unregister_hw+0x5d/0x2a0 net/mac80211/main.c:1512
 mac80211_hwsim_del_radio+0x274/0x450 drivers/net/wireless/virtual/mac80211_hwsim.c:5413
 hwsim_exit_net+0x585/0x640 drivers/net/wireless/virtual/mac80211_hwsim.c:6290
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x6f4/0xb90 net/core/net_namespace.c:652
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 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 (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/19 19:02 linux-6.6.y bb9c90ab9c5a 254a27c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/19 18:28 linux-6.6.y bb9c90ab9c5a 254a27c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/19 08:50 linux-6.6.y bb9c90ab9c5a 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/19 06:58 linux-6.6.y bb9c90ab9c5a 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/17 23:43 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/17 23:41 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/09 10:41 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/09 05:43 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/05 20:20 linux-6.6.y 3a8ababb8b6a 37880f40 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/05 05:24 linux-6.6.y 3a8ababb8b6a f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
2025/08/04 22:08 linux-6.6.y 3a8ababb8b6a f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_link_release_channel
* Struck through repros no longer work on HEAD.