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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 F39B0C433E0 for ; Mon, 10 Aug 2020 12:41:20 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B253620678 for ; Mon, 10 Aug 2020 12:41:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B253620678 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 10D4C8D0001; Mon, 10 Aug 2020 08:41:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0982F6B0006; Mon, 10 Aug 2020 08:41:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EA0528D0001; Mon, 10 Aug 2020 08:41:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0249.hostedemail.com [216.40.44.249]) by kanga.kvack.org (Postfix) with ESMTP id CFF656B0005 for ; Mon, 10 Aug 2020 08:41:19 -0400 (EDT) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 6C4BC8248047 for ; Mon, 10 Aug 2020 12:41:19 +0000 (UTC) X-FDA: 77134619478.12.song12_220faab26fda Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin12.hostedemail.com (Postfix) with ESMTP id 41BC71814CBE8 for ; Mon, 10 Aug 2020 12:41:19 +0000 (UTC) X-HE-Tag: song12_220faab26fda X-Filterd-Recvd-Size: 5422 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Mon, 10 Aug 2020 12:41:18 +0000 (UTC) Received: by mail-il1-f200.google.com with SMTP id t79so7688438ild.5 for ; Mon, 10 Aug 2020 05:41:18 -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=8FpRlx12JXZpYMKALW3p4bO1L8myHn0GObzI1j2u9CM=; b=COai9Eui8c98B0QIraca5XpjMGLNhKGfNLtQ9kB9ZoYt/K+ypg62Cf5a7vFjohrtxK DbVw3Z5ba2U/xWhxF7UEBmt69wwqWrYEnQnzkG8G+B7GnLmhgDlQJtr5dV7zfN9pqi/t GkyV1vdx5zftahVQMGaGrx+52sdxKVcMmkqwaIg+sspz4+dM67JM8DiQpKwLw0aydtau LzBFvEJxNZTXg8tmzq/pS7eRIFFV5PuiyMKJQtLMYmXMJ+bq7R3g39nU3ZtEg+WgZKGq fjSEGdvDjGoEIbqjcYgsigv0gSwOBOiI3AQBQ4gOnVuy49wpOuWAyprZFzqpCq2MhvEO r8LQ== X-Gm-Message-State: AOAM530ox8muVtsdaMwZ5+lAuNkRbZDZAelD8g3oh7P15+m+sgIdjI5c cP1Q08L5rL12s9ok4p4GjqgLyldYbPGCuUkeHHbkYVHvLaHT X-Google-Smtp-Source: ABdhPJxmorMnL/jYRyFRA7cvUD4V+Xve2rdk0BZg2GTdbKiByML7Eh7x1ol9o8uhQcYR1VE6rfsAoQJEfYDNFINMYVzfJr9qGCh8 MIME-Version: 1.0 X-Received: by 2002:a05:6638:22d0:: with SMTP id j16mr19825826jat.97.1597063278271; Mon, 10 Aug 2020 05:41:18 -0700 (PDT) Date: Mon, 10 Aug 2020 05:41:18 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000062a49205ac854581@google.com> Subject: KCSAN: data-race in __xa_clear_mark / xas_find_marked From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 41BC71814CBE8 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.418060, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello, syzbot found the following issue on: HEAD commit: fc80c51f Merge tag 'kbuild-v5.9' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13cb73fa900000 kernel config: https://syzkaller.appspot.com/x/.config?x=997a92ee4b5588ef dashboard link: https://syzkaller.appspot.com/bug?extid=0d4522639ba75b02bf19 compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b) 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+0d4522639ba75b02bf19@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in __xa_clear_mark / xas_find_marked write to 0xffff8880bace9b30 of 8 bytes by interrupt on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:85 [inline] node_clear_mark lib/xarray.c:100 [inline] xas_clear_mark lib/xarray.c:908 [inline] __xa_clear_mark+0x229/0x350 lib/xarray.c:1726 test_clear_page_writeback+0x28d/0x480 mm/page-writeback.c:2739 end_page_writeback+0xa7/0x110 mm/filemap.c:1369 page_endio+0x1aa/0x1e0 mm/filemap.c:1400 mpage_end_io+0x186/0x1d0 fs/mpage.c:54 bio_endio+0x28a/0x370 block/bio.c:1447 req_bio_endio block/blk-core.c:259 [inline] blk_update_request+0x535/0xbd0 block/blk-core.c:1576 blk_mq_end_request+0x22/0x50 block/blk-mq.c:562 lo_complete_rq+0xca/0x180 drivers/block/loop.c:500 blk_done_softirq+0x1a5/0x200 block/blk-mq.c:586 __do_softirq+0x198/0x360 kernel/softirq.c:298 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:652 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff8880bace9b30 of 8 bytes by task 12715 on cpu 0: xas_find_chunk include/linux/xarray.h:1625 [inline] xas_find_marked+0x22f/0x6b0 lib/xarray.c:1198 find_get_pages_range_tag+0xa3/0x580 mm/filemap.c:1976 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1120 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:519 filemap_fdatawait_range mm/filemap.c:554 [inline] filemap_write_and_wait_range+0x119/0x2a0 mm/filemap.c:664 generic_file_read_iter+0x11d/0x3e0 mm/filemap.c:2375 call_read_iter include/linux/fs.h:1866 [inline] generic_file_splice_read+0x22b/0x310 fs/splice.c:312 do_splice_to fs/splice.c:870 [inline] splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x56a/0xba0 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1595 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1587 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12715 Comm: syz-executor.4 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== --- 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.