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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 66F11C3A5A4 for ; Fri, 30 Aug 2019 19:28:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C39723430 for ; Fri, 30 Aug 2019 19:28:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728191AbfH3T2J (ORCPT ); Fri, 30 Aug 2019 15:28:09 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:33421 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728026AbfH3T2I (ORCPT ); Fri, 30 Aug 2019 15:28:08 -0400 Received: by mail-io1-f71.google.com with SMTP id 5so9746018ion.0 for ; Fri, 30 Aug 2019 12:28:08 -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:message-id:subject:from:to; bh=FsZT3YOiyb+RSdO03B9uEqR9QzRRsgEZdKe73XL3LGE=; b=NFCgijyZ4/LrFYurKq9iapgi+vpmUgyeXtuSxdmESbSfO7CvUKA9bNxi0md3DwERhX MHcVZoqiXsBB7tMlIWqanb0/ov38wghYbzrKDGxHMCnCQxo4pJUp5OBLBDKZ/rIdOD2I 7ekaLu1q7WUd6mt2yxnx1gWIpUlIrh0x1MaCR0Qrx/EwJz0hL8vnbuDWoGehEcugKsgM nan+s7Dc3tBW206MIPNtTD7Vr7q2iFLSI9zWRmFPHoMgZIschyiGE6CrvHKnoQJU3tSC nVMwKLwF8S2bCIxxJM6wQ3/RBNn/s5u9tYt4fH+TnCZXTDCDiVZhhg3qb0w/rn3SFaEe kVbg== X-Gm-Message-State: APjAAAWpx8JDhJhKOFddZtrNnPME7KkN0HhkCdQ01IUmRxvp/f8Mn+0J cSPSANXI2Y8oEAL0mdFaTn6dZb+clJp7KBCKCv/h6HhDcuKG X-Google-Smtp-Source: APXvYqyIC295ngKPQvaPHvVRjgln7ZY90xzgn2aZ5O1dn/DrG9wZm3Vq2gAOhal8qpX/PfOpzXdW2QpihYYiAcBNzXYuuaem2zH0 MIME-Version: 1.0 X-Received: by 2002:a6b:ba85:: with SMTP id k127mr904273iof.101.1567193287992; Fri, 30 Aug 2019 12:28:07 -0700 (PDT) Date: Fri, 30 Aug 2019 12:28:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000039af4d05915a9f56@google.com> Subject: INFO: task hung in p9_fd_close From: syzbot To: asmadeus@codewreck.org, davem@davemloft.net, ericvh@gmail.com, linux-kernel@vger.kernel.org, lucho@ionkov.net, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, v9fs-developer@lists.sourceforge.net Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 6525771f Merge tag 'arc-5.3-rc7' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1118a71e600000 kernel config: https://syzkaller.appspot.com/x/.config?x=58485246ad14eafe dashboard link: https://syzkaller.appspot.com/bug?extid=8b41a1365f1106fd0f33 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1125ee12600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8b41a1365f1106fd0f33@syzkaller.appspotmail.com INFO: task syz-executor.1:13699 blocked for more than 143 seconds. Not tainted 5.3.0-rc6+ #94 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28888 13699 9148 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x877/0xc50 kernel/sched/core.c:3880 schedule+0x131/0x1e0 kernel/sched/core.c:3947 schedule_timeout+0x46/0x240 kernel/time/timer.c:1783 do_wait_for_common+0x2e7/0x4d0 kernel/sched/completion.c:83 __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x47/0x60 kernel/sched/completion.c:136 __flush_work+0xd4/0x150 kernel/workqueue.c:3040 __cancel_work_timer+0x420/0x570 kernel/workqueue.c:3127 cancel_work_sync+0x17/0x20 kernel/workqueue.c:3163 p9_conn_destroy net/9p/trans_fd.c:868 [inline] p9_fd_close+0x297/0x3c0 net/9p/trans_fd.c:898 p9_client_create+0x974/0xee0 net/9p/client.c:1068 v9fs_session_init+0x192/0x18e0 fs/9p/v9fs.c:406 v9fs_mount+0x82/0x810 fs/9p/vfs_super.c:120 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:661 vfs_get_tree+0x8f/0x380 fs/super.c:1413 do_new_mount fs/namespace.c:2791 [inline] do_mount+0x169d/0x2490 fs/namespace.c:3111 ksys_mount+0xcc/0x100 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3331 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459879 Code: 8b 44 24 18 48 8b 4c 24 30 48 83 c1 08 48 89 0c 24 48 89 44 24 08 48 c7 44 24 10 10 00 00 00 e8 0d da fa ff 48 8b 44 24 18 48 <89> 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 e8 14 b9 ff ff eb 82 cc RSP: 002b:00007f6b4dda7c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459879 RDX: 0000000020000140 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000075c118 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6b4dda86d4 R13: 00000000004c5e2f R14: 00000000004da930 R15: 00000000ffffffff INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc6+ #94 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xbb9/0xbd0 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 --- This bug is generated by a bot. It may contain errors. 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