From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.167.199 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792663284; b=uUPaQGXNl8DNPDQmqV8LaXj1kcKupy9Ld8u9DxZBwLrxZw7TTcguTt+TFTfPW/nyVY0v DiVCCwJnoYo/bO1smtcN59Y1ax1IEHa5Nlgjp/9dj/4rSa6UbWoHiZzMdWtho3uxIlGzo UhVn9YmQxKrt9Hh03cTNJ7qgm396IOykbbXSz3jrQDVq5JhoobIbo82fI8E43mcSF2LKc aNcbhpQe/33UXAzTSGSd3UUAReE6iozEDYCEXr1rgbRezNoM7Gz38kALLmdeQRrjbtHIR baIDTsiCqsn7BA2sT5O/u6oALNqAWexd98VULTi0K+KQYEbqGPLUgJKsREdfV3T0otQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792663284; h=DMARC-Filter:Received:X-Google-DKIM-Signature:X-Forwarded-Encrypted: X-Gm-Message-State:MIME-Version:X-Received:Date: X-Google-Appengine-App-Id:X-Google-Appengine-App-Id-Alias:Message-ID: Subject:From:To:Content-Type; bh=BWI3Lrcifhq07nHl0S5uej8tCbV/Fgv3NaO9h++jNTo=; b=tYkV3hxydHZ2CFVYaWzyhp1++T75qX40D7t5gYuotHLuwqOJwlUQrK3nkzXYiOEEwCtE efxM8S0e8D1rAkBcz1pYVnygZO/sIdkR1iyNbZp0l7aDUZh+bqJsZ38fwo6BfS62JBwfc 0G8Hy9aVOF6qesgWiF71bdKQFYT1ggtb7tlC1FYWFoKjpQAI8AmsiIT/2Ut1sfMK4HVP9 oPgTKMATiKceUnBOaKJif4gGwWViy1G/a8t/2feP+dyw8rgI0iY/vEIBglCLatvn3O9FV hTATYlvl/njgeQOlQAUSZ2Le5HHgapohchIEX+Uf4ODYC3GV6qdhOdo/G7RlijDLrrw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.remote-ip=209.85.167.199 Received: from mail-oi1-f199.google.com (mail-oi1-f199.google.com [209.85.167.199]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 78814606A31D for ; Thu, 22 Oct 2026 10:01:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 78814606A31D 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-oi1-f199.google.com with SMTP id 5614622812f47-5587351d419so398710b6e.1 for ; Thu, 22 Oct 2026 03:01:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792663283; x=1793268083; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=BWI3Lrcifhq07nHl0S5uej8tCbV/Fgv3NaO9h++jNTo=; b=o1Nk7zZaDoGMOXaGGTADlnypwORtq0j/GS75ErtITvkg/g4NGgadqk5gUj1OH1W7rV ThThUtFiWbnyKwnxVvLwlo5vy2krgzMlkg1y+30pv3mjOGGXvOmoI45hc7tlwu0xzpfM BSCAz2Z4TGZYPFO+W5bP0S1hmu1wdtdQC40fA1RcO85bcnGC3rLmgGa/MBvO5/bAOx+K m3F/2TMnucSgVYGXH0qzxlZRYq9bJ3Xr+JZNIDiv6Q+ODQxSYZ/Wdgqtzf1/0xDDzMuk UVpvR00QUKohJczNgBkl3f/woLpU1m0p9FC44CCdIiooL/jyD4JQ2Dj5nuzCHOjRaCWH vocQ== X-Forwarded-Encrypted: i=1; AKwUvBwEas3JC3Jq80XinB3pun0XR12EDw0N6w7alpJ75dNpBbsyEbj2cFAOYmDZRYRuaARfUbY413DvUEp/AZbb@vger.kernel.org X-Gm-Message-State: AFq9FYKwGsGZCpqV2bpy7oOt/2H/Bf6nZ2IIEcjfrWQ1CP3KgP+E2NTb o4/g4Hi5lo0Jvf+v62k7iPC27AQTnNsTcG4CWbNhyLTzUJx1zdIeqIR+P869rA810fj+qbkvu3B ipQYexNSVZbYVpILE/2Usi8ilBgkEHru6OcuJmE17eVKfJxRBd0a7grkH64s= X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-Received: by 2002:a05:6808:152a:b0:4a4:744:a4ff with SMTP id 5614622812f47-5534f045a74mr2683712b6e.4.1792663283371; Thu, 22 Oct 2026 03:01:23 -0700 (PDT) Date: Thu, 22 Oct 2026 03:01:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ad9def3.3ebfcf67.79b0c.0095.GAE@google.com> Subject: [syzbot] [fs?] [mm?] KCSAN: data-race in xas_create / xas_find (10) From: syzbot To: akpm@linux-foundation.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a804c5742bff Merge tag 'lsm-pr-20261016' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10762231580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e0a09745349d136e dashboard link: https://syzkaller.appspot.com/bug?extid=73641b60a3bc11dfca8c compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/171f09113e28/disk-a804c574.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0f8812b149fb/vmlinux-a804c574.xz kernel image: https://storage.googleapis.com/syzbot-assets/6349a85938ab/bzImage-a804c574.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+73641b60a3bc11dfca8c@syzkaller.appspotmail.com loop6: detected capacity change from 0 to 1024 EXT4-fs: Ignoring removed i_version option EXT4-fs (loop6): Unsupported encryption level 6 ================================================================== BUG: KCSAN: data-race in xas_create / xas_find write to 0xffff88811a8efda9 of 1 bytes by task 6715 on cpu 1: xas_expand lib/xarray.c:620 [inline] xas_create+0x685/0xbf0 lib/xarray.c:661 xas_store+0x6f/0xce0 lib/xarray.c:795 __filemap_add_folio+0x647/0x910 mm/filemap.c:915 filemap_add_folio+0x1cd/0x380 mm/filemap.c:972 page_cache_ra_unbounded+0x1a4/0x3a0 mm/readahead.c:293 do_page_cache_ra mm/readahead.c:348 [inline] force_page_cache_ra+0x190/0x1d0 mm/readahead.c:378 page_cache_sync_ra+0x11d/0x560 mm/readahead.c:602 filemap_get_pages+0x2f2/0x1360 mm/filemap.c:2714 filemap_read+0x21c/0xad0 mm/filemap.c:2824 blkdev_read_iter+0x21e/0x2d0 block/fops.c:838 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x699/0x7c0 fs/read_write.c:574 ksys_read+0xdc/0x1a0 fs/read_write.c:716 __do_sys_read fs/read_write.c:725 [inline] __se_sys_read fs/read_write.c:723 [inline] __x64_sys_read+0x40/0x50 fs/read_write.c:723 x64_sys_call+0x2135/0x2550 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811a8efda9 of 1 bytes by task 6813 on cpu 0: xas_find+0x360/0x3e0 lib/xarray.c:1421 find_get_entry mm/filemap.c:2085 [inline] find_lock_entries+0xd4/0x6b0 mm/filemap.c:2189 mapping_try_invalidate+0xc7/0x430 mm/truncate.c:545 invalidate_mapping_pages+0x27/0x40 mm/truncate.c:602 invalidate_bdev+0x58/0x70 block/bdev.c:101 __ext4_fill_super fs/ext4/super.c:5840 [inline] ext4_fill_super+0x2cd3/0x37c0 fs/ext4/super.c:5865 get_tree_bdev_flags+0x291/0x300 fs/super.c:1883 get_tree_bdev+0x1f/0x30 fs/super.c:1906 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5897 vfs_get_tree+0x57/0x1d0 fs/super.c:1943 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x288/0x730 fs/namespace.c:3986 path_mount+0x4ad/0xb90 fs/namespace.c:4337 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4542 __x64_sys_mount+0x67/0x80 fs/namespace.c:4542 x64_sys_call+0xc3b/0x2550 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x03 -> 0x00 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 6813 Comm: syz.6.569 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 ================================================================== --- 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