From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) (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 9CC5578F3A for ; Tue, 30 Dec 2025 02:08:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767060485; cv=none; b=F/rSWPx154f1eEcXeCzklB9XSdM8fcC5jihODg56qBYRG4/+IJXL80K/pdeaRUpZ5vdicdG+x/3iwecOZPIgnS0gnG82zd62gqWZ9TC9bo9U8YLHvk4bq878SKP53lbCnko0gx5JdY7B5l9IeXTOmLHJ6ujfV1CLxFjDIEZpMi0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767060485; c=relaxed/simple; bh=XkwrjTdNN2xK+f7ym3i5GpXsFytc2WJ31vGsfR6bXbk=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=hricxW6R5K8eD4fyyom9AqlfPb5D7bL42M4OyN5n4Jg7m/q+9RqnRkDCIwrZsOqcutdOTJAjoSfRcHUX/UoNe2DkmP/6TAl5uB9ttD7kLnnz3ok0p7lB3wnqwVsBIutKrmwyfbIQQcTD1QGH2i/JUOkPQJ58x/NFdhTPXFOFNzY= 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=209.85.210.69 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-ot1-f69.google.com with SMTP id 46e09a7af769-7cb133bc2d0so14553815a34.2 for ; Mon, 29 Dec 2025 18:08:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767060482; x=1767665282; 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=bVIekfbJX63geSkptM97RNPZ/3HjAZq1BEZgh/8B3AM=; b=dGDuWHuaLiZpnmpIYXk6CrX8wutGZP/c2Ym1VSvnoI0Qf4sW8jRPNwQ1GAYvCynh15 EG1SM8COwL8nVKmE7KQz8fyeiPsU9BjH+TCbF6qeFR0KwIOoPkn5C33ZkazDwHwagqd8 4iAQHCNxsJ2XApMRkjk4bKahXFG/2jizA+5EPhAvE9z65d3n/pphcJdglPyZjpD0LxQ7 ET0sPkMM1yFwIFUboOPDbqS0bFgh4jXcW3LIc3msp+E9VIHYPOCUDOTk7d2QQWalA6fi pYZTjHezU4Df/bsQxsy88PF/HnZ0H5NYbwsj5TRJw+igfnYMKPmxcpV89zcU3Qs8k3uA vDOQ== X-Gm-Message-State: AOJu0YyIB4LfVFuMu7kku7u0ALBF/mTM+nk3CkgEtIa2bdI3bJhi+oXZ c7QlmxMjB014pFvPoOg0hjQ7VmxqXMg4RxEiua9Mv4ksxP6Ow9DLQdkIC07ZG5TvGRNj56rAzNF L73CvUG1+WzO4KofO6VY9nbGcDrVmf0Kr8sUXkMzlWmYghuY6P0pVkBpvJe8= X-Google-Smtp-Source: AGHT+IGs3PIFoVrPlRvCB+gc0Tkr4lr97QWIidfrxfUf5LtBBy3TxC6i1CDjbbTdA6GrF/SeR4eXQFAn5aElDHvdoPhDr6nWFA4S Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2289:b0:659:9a49:90b5 with SMTP id 006d021491bc7-65d0ea5b5d2mr12993392eaf.52.1767060482468; Mon, 29 Dec 2025 18:08:02 -0800 (PST) Date: Mon, 29 Dec 2025 18:08:02 -0800 In-Reply-To: <967783f9-abba-434b-8ee0-6b919b1fbc48@I-love.SAKURA.ne.jp> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69533402.050a0220.329c0f.0428.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/u8:14:4104 blocked for more than 145 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:14 state:D stack:0 pid:4104 tgid:4104 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 INFO: task kworker/0:3:6622 blocked for more than 149 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:3 state:D stack:0 pid:6622 tgid:6622 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 class_wiphy_constructor include/net/cfg80211.h:6363 [inline] reg_process_self_managed_hints+0x98/0x1dc net/wireless/reg.c:3179 reg_todo+0x81c/0x98c net/wireless/reg.c:3192 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: 3 locks held by kworker/u8:0/12: #0: ffff0000c0031948 ((wq_completion)events_unbound#2 ){+.+.}-{0:0}, at: raw_spin_rq_lock_nested kernel/sched/core.c:639 [inline] ){+.+.}-{0:0}, at: raw_spin_rq_lock kernel/sched/sched.h:1558 [inline] ){+.+.}-{0:0}, at: rq_lock kernel/sched/sched.h:1885 [inline] ){+.+.}-{0:0}, at: __schedule+0x370/0x2a7c kernel/sched/core.c:6768 #1: ffff00019bc0c588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x6c/0x6dc kernel/sched/psi.c:933 #2: ffff00019bc0de98 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] #2: ffff00019bc0de98 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x19c/0xd00 kernel/time/timer.c:1085 2 locks held by kworker/u8:1/13: #0: ffff0000d5d53948 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff800097d07be0 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 1 lock held by khungtaskd/32: #0: ffff80008fa5b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by kworker/u8:3/42: #0: ffff0000c0032148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff800097ff7be0 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 3 locks held by kworker/u8:6/713: #0: ffff0000c0032148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff80009da57be0 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ae45e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:7/1561: #0: ffff0000c0031948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a0627be0 ((work_completion)(&rdev->wiphy_work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 Tested on: commit: 8640b745 Merge tag 'kbuild-fixes-6.19-1' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1664c422580000 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=149bbb92580000