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 C6CD11CD1F for ; Mon, 5 May 2025 06:32:28 +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=1746426750; cv=none; b=c9C2EEFIKgwtXeH4sGg4FsH+28DLagIg89kcNsT0S2pn7+H+kPY3O6OSyianU7PqMWtqIkIO8Lq6y2PeqUr7wnGkqiH/mujD77obGduSbPporxjX/ynnAfWu+Mfei3uXLdG01mMWVibgqsWi/2brIue7mEox175aHZiiutZg46Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746426750; c=relaxed/simple; bh=OtNU6mzCem93CXwpanDEXPuyHLI6NhY6SdGt5/Y4z74=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=PoBUp9tpTwp7GSYqG2eVJhDJ/8LiQuWYW+tFP9A1CABBGbJnLU18SSw41dVLjFSYbFeBZVwa4TtEZLrmmwBOdv0o7aRU7itkPjxaPGPmVmTwn3PiOOg/IdLT+lMBl8RNox4KuNiVAqPX7MSzijqu98HPFKu3DPKe9oFjzbszYKI= 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-3da644c8ffeso7748425ab.1 for ; Sun, 04 May 2025 23:32:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746426748; x=1747031548; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=jciCBvpJMPCsGzJAvlJuyv4rYfnLubqw6+5EsVzDqYM=; b=JQv8YtYu71EAecT7Fn7YoUMxWvkboLiLNq40DCwSH8JDQYu4OvDX+4rzz5XqnGp35x y2djm4yLjU4iOJRpl1/2Fx+t3pGvgTmWrEN2KKnXPJudT2leSpzQmOQk9/xFDUklr6vf MxYAtBE+SdPu50ICZKIJzl6ym0V2QM+8/jraCV8pKw7CrPbilTPtlSWDMzw8fmUFPTyo lKbMMrQyPnXjnpPACwT17V7KZtKjvZKfo4mcBe2Cimf3mP8rORiK1d/InFBbs4cJ9aVg QCnndm8TMuLMQfu/JLRve2j852h2qs7jLOm9GDKMhyWWvhzAprtAeMM4DOiIHLGgTQar 0q7g== X-Forwarded-Encrypted: i=1; AJvYcCWvL8XlHGreB2pcyKKEc3SyzTl0yFI+E9HJdBen3CeEKwBUFiZdjCIwUgz8bH5Hz7uoUz4Mtj61AvgT9p0=@vger.kernel.org X-Gm-Message-State: AOJu0YwVTgNyU/Cy1ClKtd1nVmQB5/FlI/QbKSAw4muyOYh+q6R/qxCS fd5BnU/59DY5zyE0hfqsPEcc62zt/mu5k+wybnGpaykg47rlI5Gkf5H7S+ERzuJvW94ke6lEJfU MUEjxaig9XeHUibD9cNaI5zGKqIKMoY6ic6rtkePGuvs3W8eQDrcjY8c= X-Google-Smtp-Source: AGHT+IFSLSNPAVyoQ4sFcmlUIENB3FviF0hXfelk2zvpKzKiaA3VUb6/Z4KU9XvFcfFLH6QuhGwowcbQyRlz2rqBpcHl6eJknjU/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:250e:b0:3d8:211c:9891 with SMTP id e9e14a558f8ab-3da5b23b7e2mr56631335ab.2.1746426747907; Sun, 04 May 2025 23:32:27 -0700 (PDT) Date: Sun, 04 May 2025 23:32:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68185b7b.a70a0220.254cdc.0046.GAE@google.com> Subject: [syzbot] [afs?] INFO: task hung in afs_cell_purge (2) From: syzbot To: dhowells@redhat.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, marc.dionne@auristor.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 7a13c14ee59d Merge tag 'for-6.15-rc4-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=149171b3980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a42a9d552788177b dashboard link: https://syzkaller.appspot.com/bug?extid=750f21d691e244b473b1 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13a101cc580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2d34ac632fce/disk-7a13c14e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2ec4e8918d72/vmlinux-7a13c14e.xz kernel image: https://storage.googleapis.com/syzbot-assets/43b472fdcb30/bzImage-7a13c14e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/9edd5a22bff1/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=15a101cc580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+750f21d691e244b473b1@syzkaller.appspotmail.com INFO: task kworker/u8:0:12 blocked for more than 143 seconds. Not tainted 6.15.0-rc4-syzkaller-00051-g7a13c14ee59d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:22568 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x168f/0x4c70 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x165/0x360 kernel/sched/core.c:6860 afs_cell_purge+0x3d9/0x540 fs/afs/cell.c:893 afs_net_exit+0x50/0x100 fs/afs/main.c:146 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x717/0xbd0 net/core/net_namespace.c:654 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Showing all locks held in the system: 3 locks held by kworker/u8:0/12: #0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319 #1: ffffc90000117c60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90000117c60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319 #2: ffffffff8f2d54d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608 1 lock held by khungtaskd/31: #0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764 3 locks held by kworker/u8:4/62: #0: ffff88803005a948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88803005a948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319 #1: ffffc9000154fc60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc9000154fc60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319 #2: ffffffff8f2e2008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8f2e2008 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0 net/ipv6/addrconf.c:4195 3 locks held by kworker/u8:8/1156: #0: ffff88801a089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801a089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319 #1: ffffc90003f3fc60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90003f3fc60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319 #2: ffffffff8f2e2008 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303 2 locks held by getty/5576: #0: ffff88803068f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fee2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 1 lock held by udevd/5864: 2 locks held by udevd/5888: 1 lock held by syz-executor/18951: #0: ffffffff8df41338 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline] #0: ffffffff8df41338 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b7/0x730 kernel/rcu/tree_exp.h:998 3 locks held by syz-executor/19370: #0: ffffffff8ea7bd60 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8ea7bd60 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8ea7bd60 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:570 #1: ffffffff8f2e2008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffffffff8f2e2008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffffffff8f2e2008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70 net/core/rtnetlink.c:4064 #2: ffffffff8df41338 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline] #2: ffffffff8df41338 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f4/0x730 kernel/rcu/tree_exp.h:998 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-00051-g7a13c14ee59d #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline] watchdog+0xfee/0x1030 kernel/hung_task.c:437 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5960 Comm: udevd Not tainted 6.15.0-rc4-syzkaller-00051-g7a13c14ee59d #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:memset_orig+0x46/0xb0 arch/x86/lib/memset_64.S:73 Code: 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 <48> 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 RSP: 0018:ffffc90003eef9c0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff888030be4000 RCX: 0000000000000037 RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffff888030be4200 RBP: 0000000000000c40 R08: ffffffff8f7daa77 R09: 0000000000000000 R10: ffff888030be4000 R11: fffffbfff1efb54f R12: ffff88801a042140 R13: ffff888030be4000 R14: 0000000000000000 R15: 0000000000001000 FS: 00007ff5bdb62c80(0000) GS:ffff888126200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564955db1000 CR3: 0000000030456000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: slab_post_alloc_hook mm/slub.c:4164 [inline] slab_alloc_node mm/slub.c:4210 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_noprof+0x248/0x4f0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:909 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:822 security_inode_getattr+0x12f/0x330 security/security.c:2377 vfs_getattr fs/stat.c:256 [inline] vfs_fstat fs/stat.c:278 [inline] vfs_fstatat+0xad/0x160 fs/stat.c:370 __do_sys_newfstatat fs/stat.c:536 [inline] __se_sys_newfstatat fs/stat.c:530 [inline] __x64_sys_newfstatat+0x11c/0x1a0 fs/stat.c:530 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5bd7165f4 Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8 RSP: 002b:00007ffccc212828 EFLAGS: 00000206 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 00007ff5bd7ee460 RCX: 00007ff5bd7165f4 RDX: 00007ffccc212830 RSI: 00007ff5bd7b3130 RDI: 0000000000000009 RBP: 0000564955796100 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000001000 R11: 0000000000000206 R12: 0000000000000002 R13: 0000000000000002 R14: 0000564955796100 R15: 0000564920123ea6 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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