IntelliJ IDEA 2020.1 (Ultimate Edition) hangs my Ubuntu 18.04 LTS - intellij-idea

Question

I don't know why but sometimes my IDE hangs for some seconds, my settings are:
-Xms128m
-Xmx2046m
-XX:ReservedCodeCacheSize=240m
-XX:+UseConcMarkSweepGC
-XX:SoftRefLRUPolicyMSPerMB=50
-ea
-XX:CICompilerCount=2
-Dsun.io.useCanonPrefixCache=false
-Djdk.http.auth.tunneling.disabledSchemes=""
-XX:+HeapDumpOnOutOfMemoryError
-XX:-OmitStackTraceInFastThrow
-Djdk.attach.allowAttachSelf=true
-Dkotlinx.coroutines.debug=off
-Djdk.module.illegalAccess.silent=true
-Dawt.useSystemAAFontSettings=lcd
-Dsun.java2d.renderer=sun.java2d.marlin.MarlinRenderingEngine
-Dsun.tools.attach.tmp.only=true
Any ideas ?
Thanks

Answer 1

It's a known Kernel bug. See also a bug report in YouTrack.
The workaround is to downgrade kernel to 5.3.0-45 version. Check the linked issues for the other possible solutions.
The issue started to occur with 5.3.0-46 kernel update. IDE thread dumps will have something like this:
"AWT-EventQueue-0" prio=0 tid=0x0 nid=0x0 runnable
java.lang.Thread.State: RUNNABLE
(in native)
at java.desktop#11.0.6/sun.java2d.loops.Blit.Blit(Native Method)
at java.desktop#11.0.6/sun.java2d.xr.XRPMBlitLoops.cacheToTmpSurface(XRPMBlitLoops.java:158)
at java.desktop#11.0.6/sun.java2d.xr.XrSwToPMBlit.Blit(XRPMBlitLoops.java:366)
at java.desktop#11.0.6/sun.java2d.pipe.DrawImage.blitSurfaceData(DrawImage.java:972)
at java.desktop#11.0.6/sun.java2d.pipe.DrawImage.renderImageCopy(DrawImage.java:583)
at java.desktop#11.0.6/sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:86)
at java.desktop#11.0.6/sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:1043)
at java.desktop#11.0.6/sun.java2d.pipe.ValidatePipe.copyImage(ValidatePipe.java:196)
at java.desktop#11.0.6/sun.java2d.SunGraphics2D.copyImage(SunGraphics2D.java:3325)
at java.desktop#11.0.6/sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:3368)
at java.desktop#11.0.6/sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:3310)
You will also see the following in the system logs (dmesg output):
[ 1177.290924] i915 0000:00:02.0: GPU HANG: ecode 11:1:0x85dffffb, in Xorg [1857], hang on rcs0
[ 1177.292069] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[ 1488.251067] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[ 1786.262953] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0