From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65097C43334 for ; Mon, 25 Jul 2022 12:36:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234790AbiGYMgT (ORCPT ); Mon, 25 Jul 2022 08:36:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232450AbiGYMgR (ORCPT ); Mon, 25 Jul 2022 08:36:17 -0400 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7732BC98 for ; Mon, 25 Jul 2022 05:36:15 -0700 (PDT) Received: by mail-io1-f71.google.com with SMTP id u10-20020a6be30a000000b0067bcbb8a637so4176470ioc.3 for ; Mon, 25 Jul 2022 05:36:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=0uOnlvEKwo0chgvpcHrAo428dCH/D37Bd91faoGhHGQ=; b=lGkxbg/KPicx5K0LDLOVGSHljKdTvh1+ntT86sltjt4+NN0pw8ya2s2Bct/2j48x3/ Q+aX0a/mELz9trEuWojCr10zlMYHm6xtouOfEoRKSQO+pOVYOWOjtHI4bSxLKxkDRanz 4qbSjuNPSiNnzXyHHBaBoJY+wWKFot1NNqUqk5BU6KIFCGMZafQUDhpRTNQuyyxN8mwD OaKqnPUqVSlAlnjmIg1JfO6XLWDJIu172XrlahkwB25g1AdLjGdPvWIQB+sd3aeVKDre bBvEjrArF2ncR1NohhkgPtoXZKlgXsziPev4ZFtsTPfXrYzJW405EmGOQIQG0WFgYuOY o/6w== X-Gm-Message-State: AJIora89iZn7s5KouZBKVzyb08S9o9mayAayAtBUNXY9oanxsS7mNPHw XM7t10UEKFyRFmRW8ZmOoUYBGrNwZFmEu/CMbHFdDZV/KarR X-Google-Smtp-Source: AGRyM1tTk3/C3rMkzMrRFsvZ4ZrsRZ7wJzK8t14/yZnOEDahqARRg6IgOXGG/sf8g5L2RAiwTwD9E6Cs2A+VWWHNxXhoNdDgvbZT MIME-Version: 1.0 X-Received: by 2002:a05:6638:2048:b0:341:590a:da16 with SMTP id t8-20020a056638204800b00341590ada16mr5008631jaj.147.1658752575177; Mon, 25 Jul 2022 05:36:15 -0700 (PDT) Date: Mon, 25 Jul 2022 05:36:15 -0700 In-Reply-To: <20220725121931.2795-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000389d905e4a06e02@google.com> Subject: Re: [syzbot] WARNING in p9_client_destroy From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in p9_client_destroy INFO: task syz-executor.0:4046 blocked for more than 143 seconds. Not tainted 5.19.0-rc4-next-20220628-syzkaller-dirty #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:24520 pid: 4046 ppid: 1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5184 [inline] __schedule+0xa09/0x4f10 kernel/sched/core.c:6496 schedule+0xd2/0x1f0 kernel/sched/core.c:6568 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 p9_client_destroy+0x306/0x3b0 net/9p/client.c:1109 v9fs_session_close+0x45/0x2d0 fs/9p/v9fs.c:504 v9fs_kill_super+0x49/0x90 fs/9p/vfs_super.c:226 deactivate_locked_super+0x94/0x160 fs/super.c:332 deactivate_super+0xad/0xd0 fs/super.c:363 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1186 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f7586c8a677 RSP: 002b:00007fffb29ce3b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f7586c8a677 RDX: 00007fffb29ce48a RSI: 000000000000000a RDI: 00007fffb29ce480 RBP: 00007fffb29ce480 R08: 00000000ffffffff R09: 00007fffb29ce250 R10: 00005555571af8b3 R11: 0000000000000246 R12: 00007f7586ce22a6 R13: 00007fffb29cf540 R14: 00005555571af810 R15: 00007fffb29cf580 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8bd864f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8bd861f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/27: #0: ffffffff8bd87040 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491 2 locks held by getty/3279: #0: ffff88814ac14098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002d162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xe50/0x13c0 drivers/tty/n_tty.c:2177 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.19.0-rc4-next-20220628-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc18/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 46 Comm: kworker/u4:3 Not tainted 5.19.0-rc4-next-20220628-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:preempt_latency_start kernel/sched/core.c:5628 [inline] RIP: 0010:preempt_latency_start kernel/sched/core.c:5623 [inline] RIP: 0010:preempt_count_add+0x81/0x140 kernel/sched/core.c:5651 Code: 05 2f b0 7e 25 ff ff ff 7f 39 c3 74 03 5b 5d c3 48 8b 5c 24 10 48 89 df e8 0c 9a 0c 00 85 c0 75 35 65 48 8b 2c 25 80 6f 02 00 <48> 8d bd 48 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc90000b779f0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff897b1e8a RCX: 1ffffffff21eeb10 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff897b1e8a RBP: ffff888017483a80 R08: ffffffff812bb538 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4129efb990 CR3: 000000000ba8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x10a/0x1350 kernel/locking/mutex.c:747 arch_jump_label_transform_queue+0x58/0x100 arch/x86/kernel/jump_label.c:136 __jump_label_update+0x12e/0x400 kernel/jump_label.c:451 jump_label_update+0x32f/0x410 kernel/jump_label.c:830 static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate mm/kfence/core.c:825 [inline] toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:803 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Tested on: commit: cb71b93c Add linux-next specific files for 20220628 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git console output: https://syzkaller.appspot.com/x/log.txt?x=16da19aa080000 kernel config: https://syzkaller.appspot.com/x/.config?x=badbc1adb2d582eb dashboard link: https://syzkaller.appspot.com/bug?extid=5e28cdb7ebd0f2389ca4 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 patch: https://syzkaller.appspot.com/x/patch.diff?x=147ce022080000