linux-kernel - [syzbot] [wireless?] INFO: task hung in reg

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Message-ID: <694eed8c.050a0220.35954c.007c.GAE@google.com>
Date: Fri, 26 Dec 2025 12:18:20 -0800
From: syzbot <syzbot+8f72a490f8e8879ee7e6@...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?] INFO: task hung in reg_todo (4)

Hello,

syzbot found the following issue on:

HEAD commit:    9448598b22c5 Linux 6.19-rc2
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=111ad392580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a94030c847137a18
dashboard link: https://syzkaller.appspot.com/bug?extid=8f72a490f8e8879ee7e6
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1007c3c2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17d4808a580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/477361b600ee/disk-9448598b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d6a6291ae36e/vmlinux-9448598b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0c0e810e0acf/bzImage-9448598b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f72a490f8e8879ee7e6@...kaller.appspotmail.com

INFO: task kworker/0:0:9 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:23672 pid:9     tgid:9     ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events reg_todo
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
 reg_todo+0x1c/0xa60 net/wireless/reg.c:3189


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

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