From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C40CE168C3F for ; Tue, 13 Aug 2024 08:50:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723539028; cv=none; b=GsFZ8NJuc2VXLZsQyMfYW504OcsC5Ic6eBqlRyxKg9zXfaowCS+nQmXbxdbDQc2H/t5sqK0jQ/zHoNlbZpxCtv+Wq3/zMLWrjjeu+TwQ8G3koTZFEWcQxJPVjXLPIKOhI6GEg+vKYMCMIm4nkb7OilPqgxd3EjBsOQ+XQovIyYU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723539028; c=relaxed/simple; bh=a77vzZH8M9X2YCz4S1gBsgqpm0rdO/QsxjeeWdRToMs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=SNj99x3bYYbgVrgFp1lqM/3m0qbfOzu/EUb4xieXi3eC2WHGtstnhkoOHPslK0k2vFsMddTlP+pqdzOfu5SFhQFOkZhoEvXa5SOP+L/lbQpfGfZeGSrAyIteg1kck25jZcPb9ILmRvF5h+Njd+nelCa70Ro/Yvvo7oo+6ZKiIoo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f199.google.com with SMTP id e9e14a558f8ab-39b0bee2173so71370055ab.2 for ; Tue, 13 Aug 2024 01:50:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723539026; x=1724143826; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=LvENnSmObhEM6ZsL9ErHbWtIin6Dvt4eRyEgj1I7YQE=; b=NOm640G3J1VE/sEp0IGlBiWsBisbOh3k5WFZH1nJwq6CP9LbRGux8DouT6a7lLqWiq hGwEAEACbdZmO48GUOO82ZELcKUZI9/MVcd+aeb0cNOONZDsJ1tnOPY7fPfwMOeOuYpa WxqCf2kQfeyA2oGumAxhthNN3ETXQN3PPGIaJZWClRhUgDPx704P8C28tsaYoi372/U8 lcWTy1Yz2KlS1M8ptJnfE/k3VMdcc90jUds6B9rxDQlpD3FZh4khuLf00+HDY4XDVMGx +ncahEk3j+q5LHehHexuHqU5Jf+cfQJQoN2l1bLGERenBOJYQJ3hxMQwrDsuypPYyqv7 okNg== X-Forwarded-Encrypted: i=1; AJvYcCUHmDv/UUH/pOfQrSY2s9eJG7fbuNXdpoKMfszvjA5LWjH1x0Gmia9ztYU4pUixmJ9dSI82W6aXX9EMHNAL0XjBI3agTTN6Ss92rbNR X-Gm-Message-State: AOJu0YzHjl3VSsQjFyulMPNXhD2xcQ0FEbMcc9hf0EX7nw+4ilxygyLh jrDXkw3ZqRXk+SNrfUOfmsV+EErcRaepwkdjHvQZ3hxuextABZ2vgA9tZxPeM0qERYyy4LsA7Bt PWrP3RbUNN3V7bja4ZQuCWr2aeZi0aK7mzM76isMBJ8k8NBzaatEnkoE= X-Google-Smtp-Source: AGHT+IFmPg87DFHnivJ8edbz8wx7pox/ARjigon/ScmR0A8+TGhf+Tv7+eV+TA98qS3nQOYEe8Ha9nU/RhQGhE9uvWzC/cBmAAVz Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a43:b0:39a:e900:7e3e with SMTP id e9e14a558f8ab-39c4790206dmr1485795ab.3.1723539025904; Tue, 13 Aug 2024 01:50:25 -0700 (PDT) Date: Tue, 13 Aug 2024 01:50:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000065552a061f8cb396@google.com> Subject: [syzbot] [io-uring?] KCSAN: data-race in io_sq_thread / io_sq_thread_park (9) 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" Hello, syzbot found the following issue on: HEAD commit: 6a0e38264012 Merge tag 'for-6.11-rc2-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1019759d980000 kernel config: https://syzkaller.appspot.com/x/.config?x=cb57e6ebf675f9d2 dashboard link: https://syzkaller.appspot.com/bug?extid=2b946a3fd80caf971b21 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/753a842a966b/disk-6a0e3826.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e12e23519777/vmlinux-6a0e3826.xz kernel image: https://storage.googleapis.com/syzbot-assets/bce0584a8cb4/bzImage-6a0e3826.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2b946a3fd80caf971b21@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in io_sq_thread / io_sq_thread_park write to 0xffff888111459638 of 8 bytes by task 10761 on cpu 1: io_sq_thread+0xdab/0xff0 io_uring/sqpoll.c:383 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 read to 0xffff888111459638 of 8 bytes by task 10329 on cpu 0: io_sq_thread_park+0x1b/0x80 io_uring/sqpoll.c:47 io_ring_exit_work+0x197/0x500 io_uring/io_uring.c:2786 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312 worker_thread+0x526/0x700 kernel/workqueue.c:3390 kthread+0x1d1/0x210 kernel/kthread.c:389 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 value changed: 0xffff8881223d0000 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 10329 Comm: kworker/u8:8 Not tainted 6.11.0-rc2-syzkaller-00027-g6a0e38264012 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: iou_exit io_ring_exit_work ================================================================== --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup