linux-kernel - Re: memory leak in rds_send

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Message-ID: <CACT4Y+a7eGJpsrenA-0RbWmwktDj5+XV4xaTeU+fiL5KXNbrqg@mail.gmail.com>
Date:   Tue, 23 Jul 2019 18:19:42 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+5134cdf021c4ed5aaa5f@...kaller.appspotmail.com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, linux-rdma@...r.kernel.org,
        rds-devel@....oracle.com
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: memory leak in rds_send_probe

On Tue, Jul 23, 2019 at 6:18 PM syzbot
<syzbot+5134cdf021c4ed5aaa5f@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    c6dd78fc Merge branch 'x86-urgent-for-linus' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14be98c8600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8de7d700ea5ac607
> dashboard link: https://syzkaller.appspot.com/bug?extid=5134cdf021c4ed5aaa5f
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=145df0c8600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=170001f4600000

+net/rds/message.c maintainers

> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+5134cdf021c4ed5aaa5f@...kaller.appspotmail.com
>
> BUG: memory leak
> unreferenced object 0xffff8881234e9c00 (size 512):
>    comm "kworker/u4:2", pid 286, jiffies 4294948041 (age 7.750s)
>    hex dump (first 32 bytes):
>      01 00 00 00 00 00 00 00 08 9c 4e 23 81 88 ff ff  ..........N#....
>      08 9c 4e 23 81 88 ff ff 18 9c 4e 23 81 88 ff ff  ..N#......N#....
>    backtrace:
>      [<0000000032e378fa>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<0000000032e378fa>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<0000000032e378fa>] slab_alloc /mm/slab.c:3319 [inline]
>      [<0000000032e378fa>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<0000000032e378fa>] __kmalloc+0x16d/0x2d0 /mm/slab.c:3664
>      [<0000000015bc9536>] kmalloc /./include/linux/slab.h:557 [inline]
>      [<0000000015bc9536>] kzalloc /./include/linux/slab.h:748 [inline]
>      [<0000000015bc9536>] rds_message_alloc+0x3e/0xc0 /net/rds/message.c:291
>      [<00000000a806d18d>] rds_send_probe.constprop.0+0x42/0x2f0
> /net/rds/send.c:1419
>      [<00000000794a00cc>] rds_send_pong+0x1e/0x23 /net/rds/send.c:1482
>      [<00000000b2a248d0>] rds_recv_incoming+0x27e/0x460 /net/rds/recv.c:343
>      [<00000000ea1503db>] rds_loop_xmit+0x86/0x100 /net/rds/loop.c:96
>      [<00000000a9857f5a>] rds_send_xmit+0x524/0x9a0 /net/rds/send.c:355
>      [<00000000557b0101>] rds_send_worker+0x3c/0xd0 /net/rds/threads.c:200
>      [<000000004ba94868>] process_one_work+0x23f/0x490
> /kernel/workqueue.c:2269
>      [<00000000e793f811>] worker_thread+0x195/0x580 /kernel/workqueue.c:2415
>      [<000000003ee8c1a1>] kthread+0x13e/0x160 /kernel/kthread.c:255
>      [<000000004cd53c81>] ret_from_fork+0x1f/0x30
> /arch/x86/entry/entry_64.S:352
>
>
>
> ---
> This bug 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@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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