linux-kernel - Re: [syzbot] memory leak in __get

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Date:   Tue, 11 Oct 2022 04:00:23 -0700
From:   syzbot <syzbot+389b82b29093b3e2640a@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, fmdefrancesco@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in __get_metapage

Hello,

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

BUG: memory leak
unreferenced object 0xffff888115b53800 (size 128):
  comm "syz-executor.0", pid 4198, jiffies 4294944352 (age 13.760s)
  hex dump (first 32 bytes):
    00 10 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:
    [<ffffffff8148f373>] mempool_alloc+0x73/0x230 mm/mempool.c:392
    [<ffffffff81c4f24e>] alloc_metapage fs/jfs/jfs_metapage.c:176 [inline]
    [<ffffffff81c4f24e>] __get_metapage+0x3ae/0xae0 fs/jfs/jfs_metapage.c:651
    [<ffffffff81c37cc2>] diNewExt+0x3f2/0x9d0 fs/jfs/jfs_imap.c:2265
    [<ffffffff81c396b4>] diAllocExt fs/jfs/jfs_imap.c:1945 [inline]
    [<ffffffff81c396b4>] diAllocAG+0x9a4/0xd50 fs/jfs/jfs_imap.c:1662
    [<ffffffff81c3b4df>] diAlloc+0x31f/0x900 fs/jfs/jfs_imap.c:1583
    [<ffffffff81c4c1da>] ialloc+0x6a/0x3a0 fs/jfs/jfs_inode.c:56
    [<ffffffff81c2e937>] jfs_mkdir+0xf7/0x480 fs/jfs/namei.c:225
    [<ffffffff815f0df3>] vfs_mkdir+0x223/0x340 fs/namei.c:4035
    [<ffffffff815f9d65>] do_mkdirat+0x1a5/0x1e0 fs/namei.c:4060
    [<ffffffff815f9ed9>] __do_sys_mkdir fs/namei.c:4080 [inline]
    [<ffffffff815f9ed9>] __se_sys_mkdir fs/namei.c:4078 [inline]
    [<ffffffff815f9ed9>] __x64_sys_mkdir+0x69/0x90 fs/namei.c:4078
    [<ffffffff845fee85>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845fee85>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff888115b53880 (size 128):
  comm "syz-executor.0", pid 4198, jiffies 4294944352 (age 13.760s)
  hex dump (first 32 bytes):
    00 10 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:
    [<ffffffff8148f373>] mempool_alloc+0x73/0x230 mm/mempool.c:392
    [<ffffffff81c4f24e>] alloc_metapage fs/jfs/jfs_metapage.c:176 [inline]
    [<ffffffff81c4f24e>] __get_metapage+0x3ae/0xae0 fs/jfs/jfs_metapage.c:651
    [<ffffffff81c37cc2>] diNewExt+0x3f2/0x9d0 fs/jfs/jfs_imap.c:2265
    [<ffffffff81c396b4>] diAllocExt fs/jfs/jfs_imap.c:1945 [inline]
    [<ffffffff81c396b4>] diAllocAG+0x9a4/0xd50 fs/jfs/jfs_imap.c:1662
    [<ffffffff81c3b4df>] diAlloc+0x31f/0x900 fs/jfs/jfs_imap.c:1583
    [<ffffffff81c4c1da>] ialloc+0x6a/0x3a0 fs/jfs/jfs_inode.c:56
    [<ffffffff81c2e937>] jfs_mkdir+0xf7/0x480 fs/jfs/namei.c:225
    [<ffffffff815f0df3>] vfs_mkdir+0x223/0x340 fs/namei.c:4035
    [<ffffffff815f9d65>] do_mkdirat+0x1a5/0x1e0 fs/namei.c:4060
    [<ffffffff815f9ed9>] __do_sys_mkdir fs/namei.c:4080 [inline]
    [<ffffffff815f9ed9>] __se_sys_mkdir fs/namei.c:4078 [inline]
    [<ffffffff815f9ed9>] __x64_sys_mkdir+0x69/0x90 fs/namei.c:4078
    [<ffffffff845fee85>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845fee85>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff888115b53900 (size 128):
  comm "syz-executor.0", pid 4198, jiffies 4294944352 (age 13.760s)
  hex dump (first 32 bytes):
    00 10 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:
    [<ffffffff8148f373>] mempool_alloc+0x73/0x230 mm/mempool.c:392
    [<ffffffff81c4f24e>] alloc_metapage fs/jfs/jfs_metapage.c:176 [inline]
    [<ffffffff81c4f24e>] __get_metapage+0x3ae/0xae0 fs/jfs/jfs_metapage.c:651
    [<ffffffff81c37cc2>] diNewExt+0x3f2/0x9d0 fs/jfs/jfs_imap.c:2265
    [<ffffffff81c396b4>] diAllocExt fs/jfs/jfs_imap.c:1945 [inline]
    [<ffffffff81c396b4>] diAllocAG+0x9a4/0xd50 fs/jfs/jfs_imap.c:1662
    [<ffffffff81c3b4df>] diAlloc+0x31f/0x900 fs/jfs/jfs_imap.c:1583
    [<ffffffff81c4c1da>] ialloc+0x6a/0x3a0 fs/jfs/jfs_inode.c:56
    [<ffffffff81c2e937>] jfs_mkdir+0xf7/0x480 fs/jfs/namei.c:225
    [<ffffffff815f0df3>] vfs_mkdir+0x223/0x340 fs/namei.c:4035
    [<ffffffff815f9d65>] do_mkdirat+0x1a5/0x1e0 fs/namei.c:4060
    [<ffffffff815f9ed9>] __do_sys_mkdir fs/namei.c:4080 [inline]
    [<ffffffff815f9ed9>] __se_sys_mkdir fs/namei.c:4078 [inline]
    [<ffffffff815f9ed9>] __x64_sys_mkdir+0x69/0x90 fs/namei.c:4078
    [<ffffffff845fee85>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845fee85>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff888116622700 (size 128):
  comm "syz-executor.0", pid 4739, jiffies 4294944954 (age 7.740s)
  hex dump (first 32 bytes):
    00 10 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:
    [<ffffffff8148f373>] mempool_alloc+0x73/0x230 mm/mempool.c:392
    [<ffffffff81c4f24e>] alloc_metapage fs/jfs/jfs_metapage.c:176 [inline]
    [<ffffffff81c4f24e>] __get_metapage+0x3ae/0xae0 fs/jfs/jfs_metapage.c:651
    [<ffffffff81c37cc2>] diNewExt+0x3f2/0x9d0 fs/jfs/jfs_imap.c:2265
    [<ffffffff81c396b4>] diAllocExt fs/jfs/jfs_imap.c:1945 [inline]
    [<ffffffff81c396b4>] diAllocAG+0x9a4/0xd50 fs/jfs/jfs_imap.c:1662
    [<ffffffff81c3b4df>] diAlloc+0x31f/0x900 fs/jfs/jfs_imap.c:1583
    [<ffffffff81c4c1da>] ialloc+0x6a/0x3a0 fs/jfs/jfs_inode.c:56
    [<ffffffff81c2e937>] jfs_mkdir+0xf7/0x480 fs/jfs/namei.c:225
    [<ffffffff815f0df3>] vfs_mkdir+0x223/0x340 fs/namei.c:4035
    [<ffffffff815f9d65>] do_mkdirat+0x1a5/0x1e0 fs/namei.c:4060
    [<ffffffff815f9ed9>] __do_sys_mkdir fs/namei.c:4080 [inline]
    [<ffffffff815f9ed9>] __se_sys_mkdir fs/namei.c:4078 [inline]
    [<ffffffff815f9ed9>] __x64_sys_mkdir+0x69/0x90 fs/namei.c:4078
    [<ffffffff845fee85>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845fee85>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd



Tested on:

commit:         60bb8154 Merge tag 'xfs-6.1-for-linus' of git://git.ke..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git --
console output: https://syzkaller.appspot.com/x/log.txt?x=171a96dc880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=589d84e4754dd2fa
dashboard link: https://syzkaller.appspot.com/bug?extid=389b82b29093b3e2640a
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1095fc78880000