From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 59DCD149C6F for ; Fri, 2 Jan 2026 10:53:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767351184; cv=none; b=sLlFzV+Gs0ERy0mKwXsgKWkLFcfLVqFojJ9nDQPNhtP1PvSEZnI9DI2qTq53maNENURfUiYKunzB2QTzBM3y956YSTx3l2aquWHzeqEqZsKmAVc/Y5YvJFsyXjr0fyLYJkozc+U28fHwDG6keV1KrtJzDPax2mSBiw+vv2OVWPw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767351184; c=relaxed/simple; bh=14ZUdMVn+xJFtifkkcpj9tFnc891jUS9V2JlCe8IpiQ=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=YeSMZb/Jf4AQlny9Rw5/elZhXbQzxWSqWGOtJEHIx0yzCdbzu/gerRWpZ1u4OEraTxxUcS1MzAtLmbkTvzDS3ogCvaKPg0uTPDyx3vcyLzVB0vPF1/5tEexOW0oqDLwbtBCcwe2M8hLqJ6hdJ7R9W7d7Z3GERMJhwmuoqoRL4Ys= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f72.google.com with SMTP id 006d021491bc7-65747f4376bso24285354eaf.2 for ; Fri, 02 Jan 2026 02:53:02 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767351181; x=1767955981; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=RxM5nbBDCGzzfxh251XrKVHnkRiOitBY4cbeMRhdczQ=; b=GdnLO7l9nm5aZxwA6kGSsWDoyBdwu/V4wWqupCT2PyDXyEovBxAuRUycHyI2axHWyN BnXet303yvts8yEQyuvfkM9FT1KJbI6mgqTskxpV78muFEdCmhmP03y2JhW5GXdpE29v GYa5ku08Mii7AoLKUMeGnTA2aNGVKFzJEDgszDBtsgsWQL5N8DX/yqUPqLbsKT6d/Til z+24X7lHObyWZCrzc1ENOUGR/JZehFFp+RC/9Ouo0l6x63qGfi3FSyPmkqOjghEjn4mZ ABuvqKD81dRwVukG1Gn3fGqcv/fa1+gNzQ3GDJIVH9lX4DrTnrOtbzyH1QrkEfpvPGwr ajCw== X-Gm-Message-State: AOJu0Yzd91qMjTtJ4n5rsPKDl0pKAg0U/8g9d0oSUD8eDGKpnndNqPUA 9w59kvaE7LAmRZACCVwsL4tl+4i1WuCyPtdkA/dvModWAHPvdGcFfBtgnk0IrCxZYsdLdkdGhxi YJezyrZxBPv6/X+vHBLNl/CWjDtIs9ZvH5GhmK6RfzdkA8Ab8IF1V/qwp9MY= X-Google-Smtp-Source: AGHT+IG+xXchSt9Z+H03Hx/Md0bimNXgRJVmS2DXKPSfuvBpvm35d3RzTjIR8lyy7/5pbY8ML3lnhZyP7cV1MVoAdBlv3O5avWR3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:22a6:b0:65c:fc52:c339 with SMTP id 006d021491bc7-65d0ea6248amr18217750eaf.29.1767351181396; Fri, 02 Jan 2026 02:53:01 -0800 (PST) Date: Fri, 02 Jan 2026 02:53:01 -0800 In-Reply-To: <55383039-4b82-4538-9ad0-af1a416187c3@I-love.SAKURA.ne.jp> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6957a38d.050a0220.a1b6.035c.GAE@google.com> Subject: Re: [syzbot] [net?] INFO: task hung in new_device_store (5) From: syzbot To: linux-kernel@vger.kernel.org, penguin-kernel@i-love.sakura.ne.jp, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in rtnl_lock 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:0 pid:9 tgid:9 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: events reg_todo Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 reg_todo+0x2c/0x98c net/wireless/reg.c:3189 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 INFO: task kworker/u8:3:42 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:3 state:D stack:0 pid:42 tgid:42 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: ipv6_addrconf addrconf_dad_work Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] addrconf_dad_work+0x100/0x10cc net/ipv6/addrconf.c:4194 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Showing all locks held in the system: 1 lock held by kthreadd/2: Tested on: commit: b69053dd wifi: mt76: Remove blank line after mt792x fi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12e1aa9a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a8594efdc14f07a dashboard link: https://syzkaller.appspot.com/bug?extid=05f9cecd28e356241aba compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=15760a22580000