linux-kernel - [syzbot] [ocfs2?] memory leak in ocfs2_new_path_from

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Message-ID: <690e2846.a70a0220.22f260.0057.GAE@google.com>
Date: Fri, 07 Nov 2025 09:11:34 -0800
From: syzbot <syzbot+cfc7cab3bb6eaa7c4de2@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, 
	linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ocfs2?] memory leak in ocfs2_new_path_from_path

Hello,

syzbot found the following issue on:

HEAD commit:    4a0c9b339199 Merge tag 'probes-fixes-v6.18-rc4' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15fbca92580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb128cd5cb439809
dashboard link: https://syzkaller.appspot.com/bug?extid=cfc7cab3bb6eaa7c4de2
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=114be17c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bfd02a09ef4d/disk-4a0c9b33.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ed9a1334f973/vmlinux-4a0c9b33.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e503329437ee/bzImage-4a0c9b33.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/275c7c156b9c/mount_0.gz
  fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=11545084580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cfc7cab3bb6eaa7c4de2@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff8881286c42a0 (size 96):
  comm "syz.3.46", pid 6293, jiffies 4294945738
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 a0 0e 30 82 ff ff ff ff  ..........0.....
    88 b8 5b 2d 81 88 ff ff c0 f4 c3 2f 81 88 ff ff  ..[-......./....
  backtrace (crc f97a0cdc):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4975 [inline]
    slab_alloc_node mm/slub.c:5280 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5758
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    ocfs2_new_path fs/ocfs2/alloc.c:688 [inline]
    ocfs2_new_path_from_path+0x4f/0x90 fs/ocfs2/alloc.c:702
    ocfs2_get_left_path.constprop.0+0x182/0x390 fs/ocfs2/alloc.c:3491
    ocfs2_merge_rec_left+0x426/0xe60 fs/ocfs2/alloc.c:3543
    ocfs2_try_to_merge_extent+0x3cb/0xe90 fs/ocfs2/alloc.c:3794
    ocfs2_split_extent+0xd2e/0x1330 fs/ocfs2/alloc.c:5139
    ocfs2_change_extent_flag+0x2ed/0x720 fs/ocfs2/alloc.c:5230
    ocfs2_mark_extent_written+0x1e3/0x2c0 fs/ocfs2/alloc.c:5276
    ocfs2_dio_end_io_write+0x5bc/0xaa0 fs/ocfs2/aops.c:2350
    ocfs2_dio_end_io+0x8c/0x180 fs/ocfs2/aops.c:2404
    dio_complete+0x12e/0x4b0 fs/direct-io.c:281
    __blockdev_direct_IO+0x1782/0x1b40 fs/direct-io.c:1303
    ocfs2_direct_IO+0xf6/0x100 fs/ocfs2/aops.c:2441
    generic_file_direct_write+0xb4/0x180 mm/filemap.c:4176
    __generic_file_write_iter+0xa1/0x130 mm/filemap.c:4345
    ocfs2_file_write_iter+0x68a/0x15a0 fs/ocfs2/file.c:2469

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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