From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (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 DF4A313D881 for ; Thu, 13 Jun 2024 09:12:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718269951; cv=none; b=CAoHnP5NyPhBgWTb/nDvDjlyPt5Ql3dpgNmefl6Uvu8AOeqclka5GqE3NiwJs6kdB0cgk+FYT+cEkLglVwW75gyKdphHmk2jmbWqZ8NrlzJp2a1AHdQwCB3zr9mb4q47e5JnTwX15FOIrf5ZFLdD7U1cMW4eqVUaHFixK38BLX4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718269951; c=relaxed/simple; bh=v3xP34y2Kqz9tAvkUGjtqaPysCSq513+rEw0ux33bZU=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=DgWIi3JLsJ6F2LIVVV4YUCiCJx4wr+iDpHbHArzbxq2pmYvFjJSyB6urxwTT3c4EHoNnomVP6yB8YqOF/c3Zfl/OQ5IfWZhcva7U2MNqP9oF+bHgtkUAtE7Gs5NwKodvG3JWlzdfzcW2PCN4W1PcpdxgpQRoTv2QanQ6BSWUB+k= 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=209.85.166.205 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-f205.google.com with SMTP id e9e14a558f8ab-375da99c867so2712955ab.0 for ; Thu, 13 Jun 2024 02:12:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718269949; x=1718874749; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=nLMUrKsMG2Xf4e/PTbl5dpOWAgPgPt620Z5seuQUYCY=; b=Qvz7Zp5naKB28qiaodEKOID+oMxAehxu6DNz1BCux8/1hTHgzn2SdzEX1OT1E3eEjT qpbdggNHtCa18e4yTq2oju10NgxgVhCzG+oz9JvLJysTkL5kMoYulErfa284rUPB3IRE bdi4N2Dq3M3KWnLB5X5jG7BPjG/iJ4rTwnnTJN1C0ZV8JfS7Krk4lv41T+B3sdWdOw+k +ls7+oixYfkCrMqRCXb5Ei7/Ku8PRswfYqjxD9IeJ9GAvz7B6jyMLi2Se3eqM46y6Zjx 2m/ygD0ckSQGNEJJBRrgb/yqZ6fclnsM6lzxgMBYJR4VT4NE/Se++nqmweXzJiZqpZZn dgWw== X-Forwarded-Encrypted: i=1; AJvYcCURYIl4Bj0szUTNla3yfJqh2msqFnBex1dM8p+bwQGym3j198K7c9/1DrPzUOit1AVczPQx12v39OsmfidydqEjtMqnQVRbbLTfYxZF X-Gm-Message-State: AOJu0YxvK2jBV18y7ti0Jlr6pJ7ZxhYfkeCwbJwhRe4L1qs9o1YQRbNY ryZhMP/phDAHbPguqnkve1hVCSGJ7rOoZJwzMqA0pFoH6sMVAhnbRwDqoLmHcFZKgbqJ9zMRHrB VV/yPFJ9qRsvnR/PdH+GDNQXVWYiWuAMvqP9TGOoYRWNPes2DJs3czDg= X-Google-Smtp-Source: AGHT+IEaTJHT00Vr7hkv4iPBqju355oH0gjr0pKcus/2z4NhB+o4fK56Kcuy5h+dtz1VI5HvFWdVZZpl5EJ8LUsfF/UEXX8H3RKK Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1feb:b0:374:70ae:e86e with SMTP id e9e14a558f8ab-375cd24a4f3mr2695675ab.6.1718269949074; Thu, 13 Jun 2024 02:12:29 -0700 (PDT) Date: Thu, 13 Jun 2024 02:12:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f17182061ac1e554@google.com> Subject: [syzbot] [ppp?] INFO: task hung in ppp_exit_net (4) From: syzbot To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-ppp@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: 2ef5971ff345 Merge tag 'vfs-6.10-rc4.fixes' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13e22cee980000 kernel config: https://syzkaller.appspot.com/x/.config?x=b8786f381e62940f dashboard link: https://syzkaller.appspot.com/bug?extid=32bd764abd98eb40dea8 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/db17be0247f3/disk-2ef5971f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/af92d227f130/vmlinux-2ef5971f.xz kernel image: https://storage.googleapis.com/syzbot-assets/f98ae987ba14/bzImage-2ef5971f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+32bd764abd98eb40dea8@syzkaller.appspotmail.com INFO: task kworker/u8:4:61 blocked for more than 143 seconds. Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:4 state:D stack:22928 pid:61 tgid:61 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 ppp_exit_net+0xae/0x3b0 drivers/net/ppp/ppp_generic.c:1131 ops_exit_list+0xb0/0x180 net/core/net_namespace.c:173 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640 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 syz-executor.2:8975 blocked for more than 143 seconds. Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26656 pid:8975 tgid:8973 ppid:5107 flags:0x00000006 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 rtnl_lock net/core/rtnetlink.c:79 [inline] rtnetlink_rcv_msg+0x372/0xea0 net/core/rtnetlink.c:6632 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2564 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0xab5/0xc90 net/socket.c:2585 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2639 __sys_sendmsg+0x117/0x1f0 net/socket.c:2668 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcb2b07cea9 RSP: 002b:00007fcb2bead0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcb2b1b3f80 RCX: 00007fcb2b07cea9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007fcb2b0ebff4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fcb2b1b3f80 R15: 00007ffcd9ec90f8 INFO: task syz-executor.4:9029 blocked for more than 144 seconds. Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:25968 pid:9029 tgid:9022 ppid:5111 flags:0x00004006 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 register_nexthop_notifier+0x1b/0x70 net/ipv4/nexthop.c:3871 ops_init+0xb9/0x650 net/core/net_namespace.c:139 setup_net+0x435/0xb40 net/core/net_namespace.c:343 copy_net_ns+0x2f0/0x670 net/core/net_namespace.c:508 create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x419/0x970 kernel/fork.c:3323 __do_sys_unshare kernel/fork.c:3394 [inline] __se_sys_unshare kernel/fork.c:3392 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3392 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9f8ae7cea9 RSP: 002b:00007f9f8bb220c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f9f8afb4120 RCX: 00007f9f8ae7cea9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000064000600 RBP: 00007f9f8aeebff4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f9f8afb4120 R15: 00007ffd19e177f8 INFO: task syz-executor.0:9026 blocked for more than 144 seconds. Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27968 pid:9026 tgid:9023 ppid:6840 flags:0x00004006 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 --- 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