From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f77.google.com (mail-oa1-f77.google.com [209.85.160.77]) (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 ACDAB212FB9 for ; Thu, 11 Dec 2025 02:20:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765419627; cv=none; b=ekvpuxKsFpI+e/l51RRaL84V9xFcy/MQs51mDrne52ONCwa9mM95WgfJ8IRzxEBnoHch0w1bBnT2+2w9bCCCz6HP3XN1jlbQBFhtVMCSAPBbtDQx9+tjA68eTFHuEskwZ7WTfOGTXbaTd9LOOIpOE4Z+mGDrOG/xXYFE2fiBsJU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765419627; c=relaxed/simple; bh=uAh3SX7bUKL+34oYxYCTvZ6/dYmXtLjDb3iocGqe7Qs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=CE2P/Z2boXkGypZ3Gzie5omgriXyl74IXSmZpkMGjdoDRYra2yEnMyhqnD5Z0WeBra8UrBXGVFWRN09JqzVoht6vnPrEr8Un8wRJ3puLtxUo064t98D/YyTlgd6UvpvK7IxUYuOTCqYCqG242JT17v7nQfnlunLYO8Q3c/ko9GM= 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=209.85.160.77 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-oa1-f77.google.com with SMTP id 586e51a60fabf-3e88192e178so489304fac.1 for ; Wed, 10 Dec 2025 18:20:25 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765419625; x=1766024425; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=i53Vsj8Q8r6Bs88aHx1o/1OfZw6DtuQiltggdysWbI8=; b=D3m9hQXclcBOvMbhCHOBbAqS2cc/fUW/9bzcQvHqrimbTfzaF/dve8Pe4Lq93dnf3N gclNRYqRvQrzpQ2eJROtsofmXVTS58dHdGngeUKRw0CthgAlfLUkz34nfG4E9tc0AyU4 evqo4Q7lIDdeTDC46CRCLI/l1FuFE1HPCghC2/Zo7ly2mX+aVxM3v5z0co4s4HDhOdv0 JZ72Sz8bwBWSy85i/rjDy/HTI/6kJgjrr90H4sAteeJaNYgjNqXZpdCQiSNN3K9/h8mf DwVhbJg2Fs12SokVVtczzPL3SGG8C/VF69ZrmZQeVyVAqI6CYt2MSPcVXtLXUr84iRDR bcNg== X-Forwarded-Encrypted: i=1; AJvYcCWpbbOWYIkoGW85ldmgwO0/emhddaFRQRNDBXGgJBa67Ap7bVlWoik8hTzzpNdfUi2IlETp+Wo6+9UDrPk=@vger.kernel.org X-Gm-Message-State: AOJu0Yw5ktCoid8AoFJksvlbCwIotleiiIO13hnakc/Pd0nz/Nrja5sZ 1LpfTpWcSIAE0VjxXsXJt22GmFMMdkFD2XDqOh1S6Jb34t2A3osG9/7r1Eco5Jq+AndxcN9YyR8 B2/afa0wyU0Tu6qZt6CeiF1P8ddRZwHbGl0r+tm/SLA+kDfLc0oDSTVhVDH0= X-Google-Smtp-Source: AGHT+IFoJmyIFvFVsGpWEMg4HPMEtEaNURt3N35jtewc5P3LMAUlsEfFSEEgtqE6GEPIt0Y9DN3Ap8mu05R6SMNKfg7xToi3xJLa Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1c83:b0:659:9a49:909d with SMTP id 006d021491bc7-65b2ac52747mr2811368eaf.28.1765419624796; Wed, 10 Dec 2025 18:20:24 -0800 (PST) Date: Wed, 10 Dec 2025 18:20:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693a2a68.050a0220.4004e.02c1.GAE@google.com> Subject: [syzbot] [ocfs2?] UBSAN: array-index-out-of-bounds in ocfs2_grow_tree From: syzbot To: jlbec@evilplan.org, joseph.qi@linux.alibaba.com, linux-kernel@vger.kernel.org, mark@fasheh.com, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 0048fbb4011e Merge tag 'locking-futex-2025-12-10' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16457992580000 kernel config: https://syzkaller.appspot.com/x/.config?x=de48dccdf203ea90 dashboard link: https://syzkaller.appspot.com/bug?extid=7c93eb455e59ca14c7cd compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-0048fbb4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d7e936edc53d/vmlinux-0048fbb4.xz kernel image: https://storage.googleapis.com/syzbot-assets/84b695b1f82c/bzImage-0048fbb4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7c93eb455e59ca14c7cd@syzkaller.appspotmail.com ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/ocfs2/alloc.c:1090:9 index -1 is out of range for type 'struct ocfs2_extent_rec[] __counted_by(l_count)' (aka 'struct ocfs2_extent_rec[]') CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455 ocfs2_sum_rightmost_rec fs/ocfs2/alloc.c:1090 [inline] ocfs2_shift_tree_depth fs/ocfs2/alloc.c:1412 [inline] ocfs2_grow_tree+0x35af/0x3dc0 fs/ocfs2/alloc.c:1560 ocfs2_insert_extent+0xb54/0x15a0 fs/ocfs2/alloc.c:4755 ocfs2_add_clusters_in_btree+0x64f/0xf50 fs/ocfs2/alloc.c:4857 ocfs2_add_inode_data+0xce/0x120 fs/ocfs2/file.c:550 ocfs2_write_cluster fs/ocfs2/aops.c:1115 [inline] ocfs2_write_cluster_by_desc+0x547/0x1cf0 fs/ocfs2/aops.c:1219 ocfs2_write_begin_nolock+0x3180/0x4300 fs/ocfs2/aops.c:1796 ocfs2_write_begin+0x1bb/0x310 fs/ocfs2/aops.c:1884 generic_perform_write+0x2c5/0x900 mm/filemap.c:4314 ocfs2_file_write_iter+0x1582/0x1cf0 fs/ocfs2/file.c:2469 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6962b8f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6963a6b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6962de6090 RCX: 00007f6962b8f7c9 RDX: 0000000000000140 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f6962c13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6962de6128 R14: 00007f6962de6090 R15: 00007ffc0ec42858 ---[ end trace ]--- --- 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