Bug 115781

Summary:	Hyper-V video driver leaking memory
Product:	Drivers	Reporter:	feduzi
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED INVALID
Severity:	normal
Priority:	P1
Hardware:	Intel
OS:	Linux
Kernel Version:	4.4.5-1	Subsystem:
Regression:	No	Bisected commit-id:

Description feduzi 2016-04-02 04:53:51 UTC

After some testing seems like hyper-v video driver is leaking memory.

The setup:
Host OS: Windows 10 + Hyper-V
Guest OS: a linux distro

Steps to reproduce (archlinux example):
1. Setup a minimal system (and xorg-server, xorg-server-utils, xterm)
2. Launch "top" and wait. (I waited for an hour, and have seen no changes in memory allocation)
3. Use "startx" to launch basic X11 session.
4. Launch "top" and wait. (It takes 5-10 minutes for me, for memory to be mostly occupied, about 20% is left)

Steps to reproduce (ubuntu server example):
1. Setup a minimal system (and xorg, xterm)
2. Launch "top" and wait. (I waited for an hour, and have seen no changes in memory allocation)
3. Use "startx" to launch basic X11 session.
4. Launch "top" and wait. (It takes 5-10 minutes for me, for memory to be mostly occupied, about 15% is left)

As seen from the 2 examples above, we have an issue across different distros.
Also I've set up the same 2 distros on VirtualBox VMs and had no issues with memory allocation, which point into Hyper-V direction.
As seen previously the issue is not occurring until X11 is not launched, which points into display-related direction.
Also to note, I tried to use top/htop tools to pinpoint a program, which leaks memory. But the most used memory percentage is 0.3 at the time when 80% of RAM is used, which points into non-program direction (I assumed driver).

Thanks.

Comment 1 feduzi 2016-04-02 05:31:42 UTC

I made a mistake thinking it is a hyperv_fb driver issue.
Though the issue is still there, but it has nothing to do with video drivers.