From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f206.google.com (mail-il1-f206.google.com [209.85.166.206]) (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 AE9FE15746A for ; Fri, 31 May 2024 11:16:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717154183; cv=none; b=eJQNGRNXSVI+PK4ROqB44BpBdh0PoNQ0kgyAwQXIdseHr3mxBkCsrySzCc6BttClOf26pc+Av6RKlXzqTvN1plWQ7x/XrjkRbRWT7Zmst1C8AuiIgE8oNtsXa6Ndy4/+ly0P5RkytdlvfU/tfVLE3HU+A6fRr+esYthQQyPoFZo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717154183; c=relaxed/simple; bh=vaJO+t7UBfSCG7w9kImcmmbHgMk84WfMTKgO0x2bVbs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=bvIDQof+quTfhVirzKtBU5JNUtzb67bcsq/nhmvDua17Iul2T0lE3txCuX+kjXr5rmgiXHbCVxIFwZRwU6hpfiBbwsUEEhQ/WyGq1/LEAxiRPPk6MzgThRdJXMxqLb3rYfVNcWsPq7jfkIzNwlaIAKTNM8QTnBKsGrVpxZrqBzE= 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=209.85.166.206 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-il1-f206.google.com with SMTP id e9e14a558f8ab-36da6da1d98so19543815ab.2 for ; Fri, 31 May 2024 04:16:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717154181; x=1717758981; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=4OINMwCS5WTA/HKJpYzdnumeRE5CjfGe5ajny/7xJwc=; b=vmPvFNJpCT7YYSYZb2pi+mdqdyoRgA/jzLKe78rJvYd8A6Sr6knSgTvYxrRyMmCEQa WqvYymiU/7n+BsCjm8Z5WvjgwbbDk81fdZDVhyhiMCXJ43kqLpNoow5wubPw1SLVuGPb tAD3AN5RaHScwvq8bWFn7clLlerIomvXLBBoc9/vzBaVj46czlmK1EGsmD4Pq1aU9QeQ 1/a5m3VlU9UNb2VCJkXLHm3xgwcrhH3zmO5jaEJGw31Vtk8BS/LRm/khI8IfES+eBtZO sYmXJpp8mHaFNkTOkUw8StUDnXd9BN7bo7FnsMsPIHpguikQ5huq4vXrHbzq1i/T6YET vFxQ== X-Forwarded-Encrypted: i=1; AJvYcCV0zI1KognnSRaAJKczV3aPTJMUKdrOTGJOZehw6IJDaKlUqa7ECAK0hhWiyaJKzdVvZp0ou1uzN1LPEasH/mEOZFYVnZlMEYC00K62 X-Gm-Message-State: AOJu0Yy6NBNv+w39HiuJGAfPv5KSXS3AkYTRWCl6H04J5rwQShrNRYSk X7qZx6sfbQZvQ4iNZWaH3USG6XTZVa07ulrRkxZmgTUsQF32AKgf8reof6x8zLwK3LNBfVUD9op NiPZSXZtfiVWJG2YU/Nab6ZvivW3Tw2Y5eywI8PVjDrIQmgSLFaTIPMI= X-Google-Smtp-Source: AGHT+IErOzCfAQfYVmXMBaHESrfjtlXqikm3OiIgkpEXhJxyh95piNezFP9946a+qaD4PZ+KAZGNTiIP7toNpNY9n1CyM67mmt/h Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a69:b0:36c:4cc9:5923 with SMTP id e9e14a558f8ab-3748b979347mr983575ab.2.1717154180868; Fri, 31 May 2024 04:16:20 -0700 (PDT) Date: Fri, 31 May 2024 04:16:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f9be320619be1c0a@google.com> Subject: [syzbot] [net?] INFO: task hung in nsim_destroy (4) From: syzbot To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4a4be1ad3a6e Revert "vfs: Delete the associated dentry whe.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14e37be6980000 kernel config: https://syzkaller.appspot.com/x/.config?x=238430243a58f702 dashboard link: https://syzkaller.appspot.com/bug?extid=8141dcbd23a8f857798a compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b1ea85ab1f5b/disk-4a4be1ad.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/681d06438c4b/vmlinux-4a4be1ad.xz kernel image: https://storage.googleapis.com/syzbot-assets/9f422d33e089/bzImage-4a4be1ad.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8141dcbd23a8f857798a@syzkaller.appspotmail.com INFO: task kworker/u8:10:2466 blocked for more than 143 seconds. Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:10 state:D stack:24624 pid:2466 tgid:2466 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 nsim_destroy+0x6f/0x6a0 drivers/net/netdevsim/netdev.c:772 __nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1425 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline] nsim_dev_reload_destroy+0x108/0x4d0 drivers/net/netdevsim/dev.c:1658 nsim_dev_reload_down+0x6e/0xd0 drivers/net/netdevsim/dev.c:965 devlink_reload+0x19a/0x7c0 net/devlink/dev.c:461 devlink_pernet_pre_exit+0x1a1/0x2b0 net/devlink/core.c:509 ops_pre_exit_list net/core/net_namespace.c:163 [inline] cleanup_net+0x488/0xbf0 net/core/net_namespace.c:620 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INFO: task kworker/1:4:5158 blocked for more than 143 seconds. Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:24768 pid:5158 tgid:5158 ppid:2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 linkwatch_event+0x51/0xc0 net/core/link_watch.c:276 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8dbb18e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8dbb18e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8dbb18e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup