[Qemu-devel] [Bug 1686390] Re: vnc server closed socket after arrow "down" keyevent

[leon]

Find the root reason: qio_channel_write is going to write 290124 data,
but only wrote 238644, and for the next write 51489, it returned error,
then trigger vnc_client_io_error and disconnect socket.


ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen)
{
    Error *err = NULL;
    ssize_t ret;
    ret = qio_channel_write(
        vs->ioc, (const char *)data, datalen, &err);
    VNC_DEBUG("Wrote wire %p %zd -> %ld\n", data, datalen, ret);
    return vnc_client_io_error(vs, ret, &err);
}

// log file


Write Plain: Pending output 0x5579e6bd2c60 size 524288 offset 290124. Wait SSF 0
address@hidden:object_class_dynamic_cast_assert qio-channel-socket->qio-channel 
(io/channel.c:60:qio_channel_writev_full)
address@hidden:object_dynamic_cast_assert 
qio-channel-socket->qio-channel-socket 
(io/channel-socket.c:508:qio_channel_socket_writev)
Wrote wire 0x5579e6bd2c60 290124 -> 290124


Write Plain: Pending output 0x5579e6bd2c60 size 524288 offset 290124. Wait SSF 0
address@hidden:object_class_dynamic_cast_assert qio-channel-socket->qio-channel 
(io/channel.c:60:qio_channel_writev_full)
address@hidden:object_dynamic_cast_assert 
qio-channel-socket->qio-channel-socket 
(io/channel-socket.c:508:qio_channel_socket_writev)
Wrote wire 0x5579e6bd2c60 290124 -> 238644
Write Plain: Pending output 0x5579e6bd2c60 size 65536 offset 51480. Wait SSF 0
address@hidden:object_class_dynamic_cast_assert qio-channel-socket->qio-channel 
(io/channel.c:60:qio_channel_writev_full)
address@hidden:object_dynamic_cast_assert 
qio-channel-socket->qio-channel-socket 
(io/channel-socket.c:508:qio_channel_socket_writev)
Wrote wire 0x5579e6bd2c60 51480 -> -2
vnc_set_share_mode/0x5579e7b6d730: shared -> disconnected

** Changed in: qemu
     Assignee: (unassigned) => leon (liayan)

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https://bugs.launchpad.net/bugs/1686390

Title:
  vnc server closed socket after arrow "down" keyevent

Status in QEMU:
  New

Bug description:
  This is a rewrite for https://bugs.launchpad.net/qemu/+bug/1670377

  QEMU 2.6 or later
  tigervncviwer 1.6

  Once get into grub boot interface(choose boot os, or recovery mode),
  keep holding press arrow down button for a while(no release), qemu
  will close the connection, vnc used zrle mode.

  Interesting place:
  1. when stopped at grub interface, only arrow up and down key could trigger 
it,
  2.  only in zrle or tight mode, could work well in raw mode
  2. it only triggered by remote connection, not happen if local vncviewer and 
vnc server

  A trace is attached.

  Thanks

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