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

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Message-ID: <697ccc24.050a0220.371857.00e5.GAE@google.com>
Date: Fri, 30 Jan 2026 07:20:04 -0800
From: syzbot <syzbot+aac438d7a1c44071e04b@...kaller.appspotmail.com>
To: kartikey406@...il.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_quota_init

BUG: memory leak
unreferenced object 0xffff88812de7c000 (size 8192):
  comm "syz.6.189", pid 7764, jiffies 4294962014
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 8429a099):
    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]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x465/0x680 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    gfs2_quota_init+0xe5/0x820 fs/gfs2/quota.c:1409
    gfs2_make_fs_rw+0x7a/0xe0 fs/gfs2/super.c:149
    gfs2_fill_super+0xfbb/0x1240 fs/gfs2/ops_fstype.c:1275
    get_tree_bdev_flags+0x1c0/0x290 fs/super.c:1691
    gfs2_get_tree+0x26/0xd0 fs/gfs2/ops_fstype.c:1334
    vfs_get_tree+0x30/0x120 fs/super.c:1751
    fc_mount fs/namespace.c:1199 [inline]
    do_new_mount_fc fs/namespace.c:3636 [inline]
    do_new_mount fs/namespace.c:3712 [inline]
    path_mount+0x5a9/0x1350 fs/namespace.c:4022
    do_mount fs/namespace.c:4035 [inline]
    __do_sys_mount fs/namespace.c:4224 [inline]
    __se_sys_mount fs/namespace.c:4201 [inline]
    __x64_sys_mount+0x1a3/0x1e0 fs/namespace.c:4201
    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:         4d310797 Merge tag 'pm-6.19-rc8' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10ccc802580000
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=116fb38a580000