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

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Message-ID: <000000000000a249880603717c15@google.com>
Date:   Mon, 21 Aug 2023 09:36:57 -0700
From:   syzbot <syzbot+1f16507d9ec05f64210a@...kaller.appspotmail.com>
To:     bigeasy@...utronix.de, davem@...emloft.net, edumazet@...gle.com,
        johannes@...solutions.net, kerneljasonxing@...il.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: [syzbot] [net?] [wireless?] INFO: task hung in reg_process_self_managed_hints

Hello,

syzbot found the following issue on:

HEAD commit:    d4ddefee5160 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1653bc65a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=aa796b6080b04102
dashboard link: https://syzkaller.appspot.com/bug?extid=1f16507d9ec05f64210a
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13e59507a80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16cd6137a80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6187f26c7496/disk-d4ddefee.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8bb63089fdb5/vmlinux-d4ddefee.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1579fb12e27b/bzImage-d4ddefee.xz

The issue was bisected to:

commit d15121be7485655129101f3960ae6add40204463
Author: Paolo Abeni <pabeni@...hat.com>
Date:   Mon May 8 06:17:44 2023 +0000

    Revert "softirq: Let ksoftirqd do its job"

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=115fece3a80000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=135fece3a80000
console output: https://syzkaller.appspot.com/x/log.txt?x=155fece3a80000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f16507d9ec05f64210a@...kaller.appspotmail.com
Fixes: d15121be7485 ("Revert "softirq: Let ksoftirqd do its job"")

INFO: task syz-executor296:5042 blocked for more than 143 seconds.
      Not tainted 6.5.0-rc6-syzkaller-00200-gd4ddefee5160 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor296 state:D stack:24336 pid:5042  ppid:5038   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6710
 schedule+0xe7/0x1b0 kernel/sched/core.c:6786
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x967/0x1340 kernel/locking/mutex.c:747
 wiphy_lock include/net/cfg80211.h:5776 [inline]
 reg_process_self_managed_hints+0x78/0x170 net/wireless/reg.c:3181


---
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.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup