netdev - Re: [syzbot] [wireless?] WARNING in rfkill

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Message-ID: <27b1ec67-cb85-4673-b6f2-00003c705b8f@I-love.SAKURA.ne.jp>
Date: Fri, 2 Jan 2026 19:28:25 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Johannes Berg <johannes@...solutions.net>,
        syzbot <syzbot+16210d09509730207241@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Cc: Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [syzbot] [wireless?] WARNING in rfkill_unregister

On 2026/01/01 21:07, Johannes Berg wrote:
> If this email doesn't wake anyone up, I'll do that on the next syzbot
> rfkill vs. NFC report I get :)

Is the next report https://syzkaller.appspot.com/bug?extid=ef8f802abdb9a32343fc ?

Obviously deadlocked (but lockdep cannot report due to dev->mutex being marked as novalidate).

INFO: task syz.4.1326:10654 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1326      state:D stack:27848 pid:10654 tgid:10645 ppid:5823   task_flags:0x400040 flags:0x00080002
Call Trace:
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 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
 rfkill_unregister+0xc8/0x220 net/rfkill/core.c:1145
 nfc_unregister_device+0x96/0x300 net/nfc/core.c:1167
 virtual_ncidev_close+0x56/0x90 drivers/nfc/virtual_ncidev.c:172
 __fput+0x44c/0xa70 fs/file_table.c:468
 fput_close_sync+0x113/0x220 fs/file_table.c:573
 __do_sys_close fs/open.c:1573 [inline]
 __se_sys_close fs/open.c:1558 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1558
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
2 locks held by syz.4.1326/10654:
 #0: ffff888078c13100 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #0: ffff888078c13100 (&dev->mutex){....}-{4:4}, at: nfc_unregister_device+0x63/0x300 net/nfc/core.c:1165
 #1: ffffffff8f5fd668 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_unregister+0xc8/0x220 net/rfkill/core.c:1145

INFO: task syz.3.1329:10652 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1329      state:D stack:26824 pid:10652 tgid:10651 ppid:5820   task_flags:0x400140 flags:0x00080002
Call Trace:
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 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
 device_lock include/linux/device.h:895 [inline]
 nfc_dev_down+0x3b/0x290 net/nfc/core.c:143
 nfc_rfkill_set_block+0x2d/0x100 net/nfc/core.c:179
 rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346
 rfkill_fop_write+0x44b/0x570 net/rfkill/core.c:1301
 vfs_write+0x27e/0xb30 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
2 locks held by syz.3.1329/10652:
 #0: ffffffff8f5fd668 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_fop_write+0x191/0x570 net/rfkill/core.c:1293
 #1: ffff888078c13100 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
 #1: ffff888078c13100 (&dev->mutex){....}-{4:4}, at: nfc_dev_down+0x3b/0x290 net/nfc/core.c:143