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    Subjectmemory leak in rds_send_probe
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    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

    IMPORTANT: if you fix the bug, please add the following tag to the commit:
    Reported-by: syzbot+5134cdf021c4ed5aaa5f@syzkaller.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@googlegroups.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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