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=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 ACC1BC433F5 for ; Sat, 4 Sep 2021 02:26:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 74A6D60F21 for ; Sat, 4 Sep 2021 02:26:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350687AbhIDC1R (ORCPT ); Fri, 3 Sep 2021 22:27:17 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:50852 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234937AbhIDC1Q (ORCPT ); Fri, 3 Sep 2021 22:27:16 -0400 Received: by mail-il1-f200.google.com with SMTP id x4-20020a92b004000000b0022b3cb3b4deso644287ilh.17 for ; Fri, 03 Sep 2021 19:26:15 -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=eZuDXPMQCsAYrQ9Tqc+DegqAnhivS7bjb8voUZo9NDI=; b=OE1SfTriY9PjhNYPhHaQonsiwq0YNy/GqTCP8d44ld8phonkiK7Kee4nCi9rueYb1z M8BJ4jU9Vj/Og0+ujksD8VE8EghJummG3gjwdQg6AbR/lZIx4bdgB//Ov7STwCOL3zov fmIeKCVxpCy63fVI8xHamUGWqJavfDrKEBo6U1jCbV9q32EZijP1qAzdZQuxYTS5s65m iSCZrLCba6nJQUV2QYn5MTDVmj8SMx9xwn628n0g1xwalVmfbYUg39ydbOaIiJE7ucto TPE5wQ1uhFuJTrbjSVbV4nynRkRhCMVESaMVxeyr39CRD9pHJywqApgur7tZUDtEFW8l EIIw== X-Gm-Message-State: AOAM5307TSuFMuprRotKXrqJ06kIn/JCEc1+1HVCrsdTe4B3MAHm9i3R Epf+gO6WEfwA9TcZZmI9EIfjxVWp0KlvCsmDiHGpzx+z+0+Y X-Google-Smtp-Source: ABdhPJwewjvm4JSqsA/w2Lhr227sbplEvma+hNb4kWxNzENoVCqdMTAKUQf1cKXS8WETD8l2pcLOGdttictZeII6tUyyJovs74/b MIME-Version: 1.0 X-Received: by 2002:a5d:9e0f:: with SMTP id h15mr1405728ioh.133.1630722375092; Fri, 03 Sep 2021 19:26:15 -0700 (PDT) Date: Fri, 03 Sep 2021 19:26:15 -0700 In-Reply-To: <20210904005650.2914-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e50e4705cb222399@google.com> Subject: Re: [syzbot] INFO: task hung in __lru_add_drain_all From: syzbot To: eric.dumazet@gmail.com, hdanton@sina.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in __lru_add_drain_all INFO: task khugepaged:1665 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:khugepaged state:D stack:24384 pid: 1665 ppid: 2 flags:0x00004000 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 __flush_work+0x56e/0xb10 kernel/workqueue.c:3083 __lru_add_drain_all+0x3fd/0x760 mm/swap.c:820 khugepaged_do_scan mm/khugepaged.c:2214 [inline] khugepaged+0x10f/0x5630 mm/khugepaged.c:2275 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 0 CPU: 0 PID: 1658 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10 Comm: kworker/u4:1 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy12 ieee80211_iface_work RIP: 0010:cmp_bss.part.0+0x1b6/0x860 net/wireless/scan.c:1320 Code: 45 31 c0 49 8d 75 1d 31 c9 e8 96 b7 ff ff 49 8d 7e 18 48 89 fa 48 89 c3 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e bc 05 00 00 41 8b 56 18 45 31 c9 45 31 c0 RSP: 0018:ffffc90000cf6d00 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffff88805f1b8e1d RCX: 0000000000000000 RDX: 1ffff1100c345993 RSI: ffffffff88697263 RDI: ffff888061a2cc98 RBP: ffff88801e32c468 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff88697224 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88805f1b8e00 R14: ffff888061a2cc80 R15: fffff5200019edea FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052f7b0 CR3: 0000000034b9b000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cmp_bss net/wireless/scan.c:1505 [inline] rb_find_bss+0x17d/0x200 net/wireless/scan.c:1505 cfg80211_bss_update+0xc6/0x2070 net/wireless/scan.c:1704 cfg80211_inform_single_bss_frame_data+0x6e8/0xee0 net/wireless/scan.c:2411 cfg80211_inform_bss_frame_data+0xa7/0xb10 net/wireless/scan.c:2444 ieee80211_bss_info_update+0x376/0xb60 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline] ieee80211_rx_mgmt_probe_beacon+0xcce/0x17c0 net/mac80211/ibss.c:1608 ieee80211_ibss_rx_queued_mgmt+0xd37/0x1610 net/mac80211/ibss.c:1635 ieee80211_iface_process_skb net/mac80211/iface.c:1439 [inline] ieee80211_iface_work+0xa65/0xd00 net/mac80211/iface.c:1493 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: 45 31 c0 xor %r8d,%r8d 3: 49 8d 75 1d lea 0x1d(%r13),%rsi 7: 31 c9 xor %ecx,%ecx 9: e8 96 b7 ff ff callq 0xffffb7a4 e: 49 8d 7e 18 lea 0x18(%r14),%rdi 12: 48 89 fa mov %rdi,%rdx 15: 48 89 c3 mov %rax,%rbx 18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1f: fc ff df 22: 48 c1 ea 03 shr $0x3,%rdx 26: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 74 08 je 0x36 2e: 3c 03 cmp $0x3,%al 30: 0f 8e bc 05 00 00 jle 0x5f2 36: 41 8b 56 18 mov 0x18(%r14),%edx 3a: 45 31 c9 xor %r9d,%r9d 3d: 45 31 c0 xor %r8d,%r8d Tested on: commit: f1583cb1 Merge tag 'linux-kselftest-next-5.15-rc1' of .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13a4f735300000 kernel config: https://syzkaller.appspot.com/x/.config?x=9c582b69de20dde2 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