From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f70.google.com (mail-ot1-f70.google.com [209.85.210.70]) (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 13ACDEEA8 for ; Tue, 30 Dec 2025 03:33:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767065584; cv=none; b=s5Qv1HPnwCTzu1OPBF+etegdMeP+oJQNC25Dui+8AFiHdm8OyN8gGK8uDE4/VqbjExn1EN4SdbjK9LbzFFDYy8gSb4wqx3xLtfBtyEuMVGePeDwBkCrx+/zGtnApgEIUXDe971ZcTY94tCg+9jxtEui3oBJqoqeQwCGW38aCJtk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767065584; c=relaxed/simple; bh=QW7eM4BzZah9krSKRwLaKO0iI0CeX3emRSGsYki+sHc=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=Mvq2MO3FD2gXdgsbROoTd/rr2tYqrJu7qocpHhSNLU/lSNZpV1eB8EkV82ikWwrib85ddrOxTx/dMojTH63HGUtWt+F2silcgp/k3SlyGDc8s767ACX2dfZT8cgBv6JaWUZet0OwtYR6cHJGDoZqTZwMe1C+hILAH2MWnoa4v6A= 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=209.85.210.70 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-f70.google.com with SMTP id 46e09a7af769-7c7032a5b40so10000676a34.1 for ; Mon, 29 Dec 2025 19:33:02 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767065582; x=1767670382; 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=hX+CqU2IyvfuoXFcg231YuBK59AkF7qJT7ghbWwCbgw=; b=odiqF5x6GerG2/s1istT1jeFLPtQEptVM4mMe2b8ob0RZEmogklTeZGmzEuxpnGFbC JdsKk3Mrdb8l7qf9WWH5fDVYYSjpurT5NbGPBR0hlIHjsjH1GQzkx8SH5rsXmckVETyT IDI9Zr4m7JfgHvrVnaPnU/rEbxM7hIAmmtTuH6ZGkpW5XOlRatjctG1/jGuBNq+GGwJY KcuSsoV6LUmsoy4clK6i7QHHW6RSSQTDUJqzHCdvIHH0ZLK9viWdTmAOIYnmWdBM7BPu kEd5WWHhfQJ35f7p3NUv9gt/sAWHGopXnzldYDVO8uGMceddXTQBvgSaHpajKa092E7S 5tgw== X-Gm-Message-State: AOJu0Yyn4sMYoi8UcCVGimZPNtjzAvbSM/4j2sV0/Euu5zadAp7yVwyp 3DxylMSckXxqD06xZrfm6eoFQ5KwWm0hKw36mjPhuYl3uixwNQAb4tBNzCqRJjBNtnuNloKtvl7 H8bHof9iaHeCzKr2g/EsvZpblD30xLvwxJ0lijiLwlyDd9NLX1gog+k0rzlY= X-Google-Smtp-Source: AGHT+IEpVK4Lut/wqTjfIGNfHh7S8X3AHoWxPaAYlqsXvR9KLxo1OBTH7nQVwLraA5QXhUi9yP5Q+47pntXz+8PgqyKvSjyYPuMT Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:cb0f:0:b0:659:9a49:8dcf with SMTP id 006d021491bc7-65d0e9e7f76mr9500879eaf.17.1767065582154; Mon, 29 Dec 2025 19:33:02 -0800 (PST) Date: Mon, 29 Dec 2025 19:33:02 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <695347ee.050a0220.329c0f.042b.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 del_device_store INFO: task syz-executor:7100 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7100 tgid:7100 ppid:7099 task_flags:0x400140 flags:0x00000010 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 device_lock include/linux/device.h:895 [inline] device_del+0xa4/0x808 drivers/base/core.c:3840 device_unregister+0x2c/0xf4 drivers/base/core.c:3919 nsim_bus_dev_del drivers/net/netdevsim/bus.c:483 [inline] del_device_store+0x27c/0x31c drivers/net/netdevsim/bus.c:244 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz-executor:7102 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7102 tgid:7102 ppid:1 task_flags:0x400140 flags:0x00000001 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 del_device_store+0xd4/0x31c drivers/net/netdevsim/bus.c:234 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz-executor:7113 blocked for more than 151 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:7113 tgid:7113 ppid:7112 task_flags:0x400140 flags:0x00800000 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 del_device_store+0xd4/0x31c drivers/net/netdevsim/bus.c:234 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0x1a8/0x23c fs/sysfs/file.c:142 kernfs_fop_write_iter+0x33c/0x4d0 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 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=170a7bb4580000 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=1002c422580000