linux-kernel - Re: [syzbot] [gfs2?] memory leak in __kthread_create_on

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <69839ab6.a00a0220.34fa92.0013.GAE@google.com>
Date: Wed, 04 Feb 2026 11:15:02 -0800
From: syzbot <syzbot+aac438d7a1c44071e04b@...kaller.appspotmail.com>
To: agruenba@...hat.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [gfs2?] memory leak in __kthread_create_on_node

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in gfs2_trans_begin

BUG: memory leak
unreferenced object 0xffff88812f712360 (size 144):
  comm "syz.3.130", pid 7417, jiffies 4294957464
  hex dump (first 32 bytes):
    fa 02 7a 82 ff ff ff ff 05 00 00 00 00 00 00 00  ..z.............
    0b 00 00 00 00 00 00 00 06 00 00 00 00 00 00 00  ................
  backtrace (crc 643c8b36):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_noprof+0x412/0x580 mm/slub.c:5270
    gfs2_trans_begin+0x29/0xa0 fs/gfs2/trans.c:120
    alloc_dinode fs/gfs2/inode.c:432 [inline]
    gfs2_create_inode+0xbfa/0x17f0 fs/gfs2/inode.c:822
    gfs2_atomic_open+0x96/0x190 fs/gfs2/inode.c:1402
    atomic_open fs/namei.c:4304 [inline]
    lookup_open fs/namei.c:4415 [inline]
    open_last_lookups fs/namei.c:4549 [inline]
    path_openat+0x158f/0x20f0 fs/namei.c:4793
    do_filp_open+0x104/0x1f0 fs/namei.c:4823
    do_sys_openat2+0xcb/0x180 fs/open.c:1430
    do_sys_open fs/open.c:1436 [inline]
    __do_sys_open fs/open.c:1444 [inline]
    __se_sys_open fs/open.c:1440 [inline]
    __x64_sys_open+0x7e/0xf0 fs/open.c:1440
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

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


Tested on:

commit:         da6f5bbc gfs2: fix memory leaks in gfs2_fill_super err..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1774a402580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9d7d0fbecb37bff8
dashboard link: https://syzkaller.appspot.com/bug?extid=aac438d7a1c44071e04b
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

Note: no patches were applied.