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 X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD6CDC433F5 for ; Sun, 5 Sep 2021 05:42:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85CAE60F22 for ; Sun, 5 Sep 2021 05:42:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235074AbhIEFWO (ORCPT ); Sun, 5 Sep 2021 01:22:14 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:38840 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233055AbhIEFWL (ORCPT ); Sun, 5 Sep 2021 01:22:11 -0400 Received: by mail-il1-f200.google.com with SMTP id j6-20020a056e02014600b00224bde51e20so2029115ilr.5 for ; Sat, 04 Sep 2021 22:21:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=NWf+5xldcIKicXDKhgBMbUv+I42tUuA2/dCHxrGc6Cw=; b=LJXxhC0Tvk1k0X7OGTMnDyA81qxVYsJ9bddTw29T4PkCfdzEKeE/NfdvZeqgOMKe9F KkuC8s/8ojCKJ5jGGGOtQx44ikfU+jCSaADUsg44FLzmolT6BdENbZvlCpBSsn6iSqxC SSWXC6Rf3faw344O24+neD+4c7Bssb/g9b6OKPeTg9BHLvxuCniJwGc6ehhzC4LuLc81 zH1JgYo+C4ALB9BhwyhV2scTWd1eJMNWIO9tcXHJJJxMoRbT60pI2GZWSFTSANxH5GQB S3Vh2EsDs5OqvLUqRDIvM+rcH8XK4iZfI0wnNf0Mc3Ulm8j2Ao61hxZ/EKQB6mXS9npM wqxA== X-Gm-Message-State: AOAM530cvkIQkwZ6F6Ngc84BauZvXZ9OENxt/+7mvRfR/CDP19YEvBOK /BG+g87hshQMswJSYLlm8qmU3iO/dbHEIa7vjN2zAveKJaqK X-Google-Smtp-Source: ABdhPJx3cp9BWRTXs+pqTa6EinJmcb9km/9IdHrDAA9mMmJr1u6sRcgdUyfecRIUYDg36U9ebRhdOdHd8TIjYx5ot+/8/01ZdJbz MIME-Version: 1.0 X-Received: by 2002:a02:7f11:: with SMTP id r17mr5663701jac.94.1630819268783; Sat, 04 Sep 2021 22:21:08 -0700 (PDT) Date: Sat, 04 Sep 2021 22:21:08 -0700 In-Reply-To: <20210905022044.3176-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000035730005cb38b3a5@google.com> Subject: Re: [syzbot] INFO: task hung in __lru_add_drain_all 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 synchronize_rcu INFO: task kworker/u4:4:135 blocked for more than 143 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:4 state:D stack:26552 pid: 135 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 __synchronize_srcu+0x1f4/0x290 kernel/rcu/srcutree.c:930 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:164 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 process_scheduled_works kernel/workqueue.c:2360 [inline] worker_thread+0x85c/0x11f0 kernel/workqueue.c:2446 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task kworker/u4:6:852 blocked for more than 144 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:25784 pid: 852 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 __synchronize_srcu+0x1f4/0x290 kernel/rcu/srcutree.c:930 fsnotify_mark_destroy_workfn+0xfd/0x340 fs/notify/mark.c:860 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 process_scheduled_works kernel/workqueue.c:2360 [inline] worker_thread+0x85c/0x11f0 kernel/workqueue.c:2446 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1634 Comm: khungtaskd Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: kworker/u4:2 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:lock_acquire+0x33/0x510 kernel/locking/lockdep.c:5593 Code: df 41 57 41 89 f7 41 56 49 89 fe 41 55 41 89 d5 41 54 41 89 cc 55 44 89 c5 53 48 81 ec b0 00 00 00 48 8d 5c 24 10 4c 89 0c 24 <48> c7 44 24 10 b3 8a b5 41 48 c1 eb 03 48 c7 44 24 18 ca d8 14 8b RSP: 0018:ffffc90000e2fba0 EFLAGS: 00000286 RAX: dffffc0000000000 RBX: ffffc90000e2fbb0 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8b97f960 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff88d220e1 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8b97f960 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc6d467a718 CR3: 000000002bece000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:410 [inline] batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:721 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: df 41 57 filds 0x57(%rcx) 3: 41 89 f7 mov %esi,%r15d 6: 41 56 push %r14 8: 49 89 fe mov %rdi,%r14 b: 41 55 push %r13 d: 41 89 d5 mov %edx,%r13d 10: 41 54 push %r12 12: 41 89 cc mov %ecx,%r12d 15: 55 push %rbp 16: 44 89 c5 mov %r8d,%ebp 19: 53 push %rbx 1a: 48 81 ec b0 00 00 00 sub $0xb0,%rsp 21: 48 8d 5c 24 10 lea 0x10(%rsp),%rbx 26: 4c 89 0c 24 mov %r9,(%rsp) * 2a: 48 c7 44 24 10 b3 8a movq $0x41b58ab3,0x10(%rsp) <-- trapping instruction 31: b5 41 33: 48 c1 eb 03 shr $0x3,%rbx 37: 48 c7 44 24 18 ca d8 movq $0xffffffff8b14d8ca,0x18(%rsp) 3e: 14 8b Tested on: commit: 49624efa Merge tag 'denywrite-for-5.15' of git://githu.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16810735300000 kernel config: https://syzkaller.appspot.com/x/.config?x=faed7df0f442c217 dashboard link: https://syzkaller.appspot.com/bug?extid=a9b681dcbc06eb2bca04 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 patch: https://syzkaller.appspot.com/x/patch.diff?x=11d0a286300000