INFO: task hung in ieee80211_register_hw (8)

Status: upstream: reported syz repro on 2026/09/12 09:57
Subsystems: wireless
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+c92af8613ad38696ff09@syzkaller.appspotmail.com
First crash: 12d, last: 4d05h
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ID Workflow Result Correct Bug Created Started Finished Revision
7d72a8a6 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: task hung in ieee80211_register_hw (8) 2026/09/02 00:42 2026/09/02 00:42 2026/09/02 01:30 587f6b29
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Title Replies (including bot) Last reply
[syzbot] [wireless?] INFO: task hung in ieee80211_register_hw (8) 0 (1) 2026/09/12 09:57
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in ieee80211_register_hw 1 4 818d 823d 0/3 auto-obsoleted due to no activity on 2024/09/23 16:13
upstream INFO: task hung in ieee80211_register_hw (2) wireless 1 2 1684d 1742d 0/29 closed as invalid on 2022/02/08 09:40
linux-4.19 INFO: task hung in ieee80211_register_hw 1 1 1452d 1452d 0/1 auto-obsoleted due to no activity on 2023/01/18 17:32
upstream INFO: task hung in ieee80211_register_hw (6) wireless 1 4 816d 842d 0/29 auto-obsoleted due to no activity on 2024/09/16 03:48
upstream INFO: task hung in ieee80211_register_hw (5) wireless 1 1 970d 970d 0/29 auto-obsoleted due to no activity on 2024/04/15 01:54
linux-5.15 INFO: task hung in ieee80211_register_hw 1 1 827d 827d 0/3 auto-obsoleted due to no activity on 2024/09/15 00:03
upstream INFO: task hung in ieee80211_register_hw (3) wireless 1 1 1651d 1651d 0/29 auto-closed as invalid on 2022/06/03 18:58
upstream INFO: task hung in ieee80211_register_hw (7) wireless 1 syz 5 681d 696d 0/29 closed as invalid on 2024/11/22 14:52
upstream INFO: task hung in ieee80211_register_hw (4) wireless 1 1 1138d 1138d 0/29 auto-obsoleted due to no activity on 2023/10/29 15:52
upstream INFO: task hung in ieee80211_register_hw wireless 1 1 2369d 2369d 0/29 auto-closed as invalid on 2020/06/15 23:33

Sample crash report:
INFO: task syz-executor:5765 blocked for more than 158 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22416 pid:5765  tgid:5765  ppid:5759   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7270
 __schedule_loop kernel/sched/core.c:7347 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7362
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821
 ieee80211_register_hw+0x3881/0x4a50 net/mac80211/main.c:1560
 mac80211_hwsim_new_radio+0x3258/0x56b0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6138
 hwsim_new_radio_nl+0xd8b/0xf90 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6957
 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/08 09:40 net-next 6f157f39d181 680aa3e1 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in ieee80211_register_hw
2026/08/31 00:06 linux-next e30626823a40 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in ieee80211_register_hw
* Struck through repros no longer work on HEAD.