From: Geoffrey McRae <1722884@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1722884] Re: keyboard input while mouse moving triggers mouse failure
Date: Sun, 29 Oct 2017 11:25:03 -0000 [thread overview]
Message-ID: <150927630377.3780.8211816102555574486.malone@gac.canonical.com> (raw)
In-Reply-To: 150774787109.964.13450141235232669497.malonedeb@chaenomeles.canonical.com
I believe I am onto the cause of this issue, because the input events
are coming from a multi threaded source (in my instance spice) keyboard
and mouse input share common code paths without any thread interlocking.
Since keyboard input takes priority over mouse, when more mouse events
are being handled it is overwriting and swapping out the data the guest
was expecting with mouse input data.
In short, there is a race condition here.
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https://bugs.launchpad.net/bugs/1722884
Title:
keyboard input while mouse moving triggers mouse failure
Status in QEMU:
New
Bug description:
When QEMU is getting a ton of mouse input events if keys are pressed
on the keyboard the scan code will be corrupted causing erroneous
behavior. I have confirmed this problem in the latest version in git
(530049bc1dcc24c1178a29d99ca08b6dd08413e0).
After the erroneous behavior the operating system issues a keyboard
reset which prevents the mouse from functioning until the operating
system is restarted.
This seems to only occur if the PS2 mouse is being used as the input,
the tablet input device doesn't exhibit this behavior.
The same problem was reported here also:
https://openxt.atlassian.net/browse/OXT-562
Host : Debian 9
CPU : Ryzen 1700X
RAM : 16GB
Kernel: 4.12.0-0.bpo.2-amd64
Guest : Windows 10 (KVM)
RAM : 8GB (1GB Huge pages)
To manage notifications about this bug go to:
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next prev parent reply other threads:[~2017-10-29 11:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 18:51 [Qemu-devel] [Bug 1722884] [NEW] keyboard input while mouse moving triggers mouse failure Geoffrey McRae
2017-10-11 18:52 ` [Qemu-devel] [Bug 1722884] " Geoffrey McRae
2017-10-12 4:12 ` Geoffrey McRae
2017-10-29 11:25 ` Geoffrey McRae [this message]
2017-12-19 18:49 ` Geoffrey McRae
2020-02-21 9:15 ` Jezze
2020-02-21 10:58 ` Geoffrey McRae
2020-10-07 18:42 ` Thomas Huth
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