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 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 C227AC433E0 for ; Mon, 15 Mar 2021 11:59:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8ED0964DD7 for ; Mon, 15 Mar 2021 11:59:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230145AbhCOL6y (ORCPT ); Mon, 15 Mar 2021 07:58:54 -0400 Received: from mail-il1-f198.google.com ([209.85.166.198]:43794 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229723AbhCOL6X (ORCPT ); Mon, 15 Mar 2021 07:58:23 -0400 Received: by mail-il1-f198.google.com with SMTP id d15so8078744ila.10 for ; Mon, 15 Mar 2021 04:58:23 -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=zVew5zknVz/SDYTOBAB5XP8NCWN9xTo8o8UbGi8sA2Y=; b=jtfFyCr8yb2N6SgOT0fDTBG0KItRw6fCO8fbR8Ps0C3VlAiY+wBFJDxziK+nS7HZ5S zJblP6HMV1d4EMPjaIMLslN3ulzvp7EVH5DbIVKBp2NUY7G6YssN4FqXz8cT/NIDAcuG qFS7TuBFLYqWUiDdY0f+8xuZQ8++O4IHz4gWZlNWzS16kBJD2tVJ3K5VYPUwqcH7QVG6 aSiUdR30suyukr/p62awyG/BYgEg1oh3rayaTeLTNwY3+E+4004YSLHUaEj+JBtEK2rp 6Qb0ad2DUs4+2v0E25ccXJJfDnDVK6d3Uz0N8C+NpHO5AZNB2KVsGSjnh0GqtQr7Rh6D s1+A== X-Gm-Message-State: AOAM5336l+w2gmGSvC3OGzv905xpBdV2JkWKwW2+HQq1lfuo2Eqc0PGr EVnCBbTMFAUBbIyOklhHcS5HnFH5q7KuviomsJz5/DrpQHU3 X-Google-Smtp-Source: ABdhPJzt6U2UiQnm1uR2O7jvWXd0cbIOd5v9irKsEuRD094wi1MXX7Y929i2+qhLbT7Ly0Q9gjCtVw2Ut9CMBwmgYbzYYgNT2L/C MIME-Version: 1.0 X-Received: by 2002:a05:6638:102f:: with SMTP id n15mr9113881jan.28.1615809502681; Mon, 15 Mar 2021 04:58:22 -0700 (PDT) Date: Mon, 15 Mar 2021 04:58:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006e9e0705bd91f762@google.com> Subject: [syzbot] WARNING in __percpu_ref_exit (2) From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, 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 found the following issue on: HEAD commit: 75013c6c Merge tag 'perf_urgent_for_v5.12-rc3' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=174df32ad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=844457676c06b88c dashboard link: https://syzkaller.appspot.com/bug?extid=d6218cb2fae0b2411e9d userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d6218cb2fae0b2411e9d@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 53 at lib/percpu-refcount.c:113 __percpu_ref_exit+0x98/0x100 lib/percpu-refcount.c:113 Modules linked in: CPU: 1 PID: 53 Comm: kworker/u4:2 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound io_ring_exit_work RIP: 0010:__percpu_ref_exit+0x98/0x100 lib/percpu-refcount.c:113 Code: fd 49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 61 49 83 7c 24 10 00 74 07 e8 28 42 ac fd <0f> 0b e8 21 42 ac fd 48 89 ef e8 e9 fa da fd 48 89 da 48 b8 00 00 RSP: 0018:ffffc90000f1fb78 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88805c976000 RCX: 0000000000000000 RDX: ffff888011839bc0 RSI: ffffffff83c76be8 RDI: ffff88802b2a9010 RBP: 0000607f46077778 R08: 0000000000000000 R09: ffffffff8fab0967 R10: ffffffff83c76b88 R11: 0000000000000009 R12: ffff88802b2a9000 R13: 0000000000000001 R14: ffff88802b2a9000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000085a0004 CR3: 000000001896a000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: percpu_ref_exit+0x3b/0x140 lib/percpu-refcount.c:134 io_ring_ctx_free fs/io_uring.c:8419 [inline] io_ring_exit_work+0x599/0xcf0 fs/io_uring.c:8565 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 --- 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.