netdev - Re: memory leak in rds_send

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Message-ID: <8a1b7a3e-0022-c101-7745-206c3d1a044e@oracle.com>
Date:   Tue, 23 Jul 2019 09:48:01 -0700
From:   santosh.shilimkar@...cle.com
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+5134cdf021c4ed5aaa5f@...kaller.appspotmail.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 7/23/19 9:19 AM, Dmitry Vyukov wrote:
> 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):

Thanks for reporting. We will look into it.

>>     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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