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_DIGITS, 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 EA14AC64E7C for ; Wed, 2 Dec 2020 21:32:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 36C96208FE for ; Wed, 2 Dec 2020 21:32:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387492AbgLBVcE (ORCPT ); Wed, 2 Dec 2020 16:32:04 -0500 Received: from mail-io1-f71.google.com ([209.85.166.71]:46827 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729451AbgLBVcE (ORCPT ); Wed, 2 Dec 2020 16:32:04 -0500 Received: by mail-io1-f71.google.com with SMTP id a2so2542302iod.13 for ; Wed, 02 Dec 2020 13:31:48 -0800 (PST) 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=Ff9eT4IKjr/d9+CBTJN/vpEU1i32CgUXCqFZBYyDY8s=; b=GBMpTXRW98Y9vbFPBugqTAIcm04Cn5B90z9I0LdScRR+IDuCsMmiW1/BYRx+KwrLnz FKAu5Sp2vfWJovAkdeAVN5NOFkKdvHKv1MlwBdmqjPuHYA8znewf9S9Wk90QiyPG8a6r UbTaPrZhSTHXY9cMComDDbEFoe9U8eLt1ELPsk9D6NOYo4zbYRLCtcSyKMV/IA9xRE64 l9wDB05Yx2kOYqCVNiIdcjyAoHYZ/THwnqfCl7f4K4UTY5dr9PGOJjBEoA/Qs8S1XjOb /6iFJso0fwe0wEY9zkUFn4FJ9/QBWxg7q8GBM7qlHL4wUMMRRybkCcOv5/urC0ir5poc 8Xjg== X-Gm-Message-State: AOAM533Q4aZ4IFl7Y/6+fZI/tLZ4SrkHdJKMPdIB87Racm9i5f21tlHK O2iNt0F92GMvLQ7dJmX3/Q65Tc4EB2r4fZZ7//WGcx/CXFnD X-Google-Smtp-Source: ABdhPJzLPKCTXPDvGdMkc1xtq05W2K1aWKZ9XhR7Fl/yf6dEmfPi+8unQRDokx5O/cfB2niOhhm2ZsC2f43gkNfS/TE+DPEjFzeM MIME-Version: 1.0 X-Received: by 2002:a02:b681:: with SMTP id i1mr153616jam.10.1606944683171; Wed, 02 Dec 2020 13:31:23 -0800 (PST) Date: Wed, 02 Dec 2020 13:31:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000003a2e105b581f7b9@google.com> Subject: WARNING in create_io_worker From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: c84e1efa Merge tag 'asm-generic-fixes-5.10-2' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14a43395500000 kernel config: https://syzkaller.appspot.com/x/.config?x=6d1e98d0b97781e4 dashboard link: https://syzkaller.appspot.com/bug?extid=fa13b30255540662f825 compiler: gcc (GCC) 10.1.0-syz 20200507 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+fa13b30255540662f825@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 3 PID: 10595 at include/linux/cpumask.h:137 rcu_read_unlock include/linux/rcupdate.h:696 [inline] WARNING: CPU: 3 PID: 10595 at include/linux/cpumask.h:137 ttwu_stat kernel/sched/core.c:2441 [inline] WARNING: CPU: 3 PID: 10595 at include/linux/cpumask.h:137 try_to_wake_up+0xef6/0x1330 kernel/sched/core.c:2984 Modules linked in: CPU: 3 PID: 10595 Comm: io_wq_manager Not tainted 5.10.0-rc5-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:tryqemu-system-x86_64: warning: guest updated active QH Code: 80 3d 93 2a 8c 0b 00 0f 84 f1 00 00 00 e8 82 80 10 00 48 c7 c6 d9 6d 4c 81 48 c7 c7 e0 77 33 8b e8 0f b7 09 00 e9 15 f9 ff ff <0f> 0b e9 65 f4 ff ff 4c 89 ff 48 89 4c 24 08 e8 b6 51 ff ff 48 8b RSP: 0018:ffffc90004b4fd50 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 1ffff92000969faf RCX: ffff88806dc24778 RDX: 1ffff1100db848ee RSI: ffffffff83b63fcb RDI: 0000000000000006 RBP: ffff88806dc24400 R08: ffff88806dc24410 R09: ffffffff8cecc98f R10: 0000000000000040 R11: 0000000000000000 R12: 0000000000000202 R13: ffff88806dc24c38 R14: 0000000000000008 R15: ffff88806dc24770 FS: 0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000339da98 CR3: 0000000020a7e000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: create_io_worker+0x590/0x8d0 fs/io-wq.c:720 io_wq_manager+0x16b/0xb80 fs/io-wq.c:785 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 --- 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.