netdev - [syzbot] [wireless?] INFO: task hung in crda_timeout

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Message-ID: <66f6e307.050a0220.38ace9.002c.GAE@google.com>
Date: Fri, 27 Sep 2024 09:53:27 -0700
From: syzbot <syzbot+d41f74db64598e0b5016@...kaller.appspotmail.com>
To: bristot@...nel.org, davem@...emloft.net, edumazet@...gle.com, 
	johannes@...solutions.net, juri.lelli@...hat.com, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, peterz@...radead.org, 
	syzkaller-bugs@...glegroups.com, vineeth@...byteword.org
Subject: [syzbot] [wireless?] INFO: task hung in crda_timeout_work (8)

Hello,

syzbot found the following issue on:

HEAD commit:    aa486552a110 Merge tag 'memblock-v6.12-rc1' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10ae0507980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6c71bad3e6ab6955
dashboard link: https://syzkaller.appspot.com/bug?extid=d41f74db64598e0b5016
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=170c659f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14a7caa9980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7c6beec63de3/disk-aa486552.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fa35efb3dd39/vmlinux-aa486552.xz
kernel image: https://storage.googleapis.com/syzbot-assets/537d8ff45d85/bzImage-aa486552.xz

The issue was bisected to:

commit 5f6bd380c7bdbe10f7b4e8ddcceed60ce0714c6d
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Mon May 27 12:06:55 2024 +0000

    sched/rt: Remove default bandwidth control

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15684507980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17684507980000
console output: https://syzkaller.appspot.com/x/log.txt?x=13684507980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d41f74db64598e0b5016@...kaller.appspotmail.com
Fixes: 5f6bd380c7bd ("sched/rt: Remove default bandwidth control")

INFO: task kworker/1:1:46 blocked for more than 144 seconds.
      Not tainted 6.11.0-syzkaller-10622-gaa486552a110 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1     state:D stack:24304 pid:46    tgid:46    ppid:2      flags:0x00004000
Workqueue: events_power_efficient crda_timeout_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6675
 __schedule_loop kernel/sched/core.c:6752 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6767
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 crda_timeout_work+0x15/0x50 net/wireless/reg.c:540
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:0/25:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701


---
This report is generated by a bot. It may contain errors.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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

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