[Bug 94205] New: Keys are stuck and not released in virt-viewer under excellent network conditions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94205

            Bug ID: 94205
           Summary: Keys are stuck and not released in virt-viewer under
                    excellent network conditions
           Product: Spice
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: spice-gtk
          Assignee: spice-bugs at lists.freedesktop.org
          Reporter: bugzilla at victortoso.com

++ This bug was originally reported in
https://bugzilla.redhat.com/show_bug.cgi?id=1286808 ++

Description of problem:

Intermittently keys are getting "stuck", using remote-viewer v2.00 and
spice-gtk 0.30. I think the issue is similar to the following bug reports:

https://bugzilla.redhat.com/show_bug.cgi?id=1086650
https://bugzilla.redhat.com/show_bug.cgi?id=812347

The main difference being that it happens on a low latency/low jitter network,
and the keys getting stuck are primarily modifier keys (CTRL the most,
sometimes ALT & SHIFT). The most common case is using CTRL+C/CTRL+V to
copy/paste, and the CTRL gets stuck or the "C" gets stuck.

Latency/Jitter example (local gigabit network):
PING 10.7.5.11 (10.7.5.11) 56(84) bytes of data.
64 bytes from 10.7.5.11: icmp_seq=1 ttl=64 time=0.222 ms
64 bytes from 10.7.5.11: icmp_seq=2 ttl=64 time=0.191 ms
64 bytes from 10.7.5.11: icmp_seq=3 ttl=64 time=0.205 ms
64 bytes from 10.7.5.11: icmp_seq=4 ttl=64 time=0.198 ms
64 bytes from 10.7.5.11: icmp_seq=5 ttl=64 time=0.200 ms
64 bytes from 10.7.5.11: icmp_seq=6 ttl=64 time=0.161 ms
64 bytes from 10.7.5.11: icmp_seq=7 ttl=64 time=0.121 ms
64 bytes from 10.7.5.11: icmp_seq=8 ttl=64 time=0.183 ms
64 bytes from 10.7.5.11: icmp_seq=9 ttl=64 time=0.130 ms
64 bytes from 10.7.5.11: icmp_seq=10 ttl=64 time=0.192 ms

--- 10.7.5.11 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 8997ms
rtt min/avg/max/mdev = 0.121/0.180/0.222/0.032 ms


Version-Release number of selected component (if applicable):

remote-viewer v2.00 
spice-gtk 0.30

How reproducible:

Unfortunately we can't reproduce it at will, but it seems to happen about 1-3x
per day, even with "xset r off" on the client.

Previously when using spicec or remote-viewer v1.00 and spice-gtk 0.28 it
seemed to happen around 4-6x per day and with more than just the modifier keys.
However since upgrading to remote-viewer v2.00 and spice-gtk 0.30 it has
reduced the occurrences significantly. Usually tapping the key that got stuck a
few more times seems to "unstick" it.

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