Two ZLS instances can sometimes end up running at the same time

[Darkyenus]

I don't know how, it might be my fault (because I was restarting IDE and force quitting zls because it was freezing on me), but I ended up with unresponsive ZLS and this error in IDE error reporting:

java.lang.IllegalStateException: Missing header Content-Length in input "otn-egh 54
{"sorc:20,i""""eut:"aaiiis:{pstoEcdn""t-6,txDcmnSn"{oeoe:re"hng"2"ilae:re"ilaeatni"tu,sv"tu}"opeinrvdr:"rgeCaatr"[.,:,"@,],/]"eovPoie"fle,cmltoIe"{lblealSpot:re}"oePoie"tu,sgaueeprvdrigrhrces:"",rtigrhrces:""}"elrtoPoie"tu,dfntoPoie"tu,tpDfntoPovidr:re"mlmnainrvdr:as,rfrnePoie"tue"ouetihihPoie"tu,dcmnSmoPoie"tru,cdAtoPoie"tu,clrrvdr:as,wrsaeyblrvdr:as,dcmnFratnPoie"tu,dcmnRaneomtigrvdr:as,rnmPoie"tu,fligagPoie"tu,slcinagPoie"tu,smniTknPoie"{lgn"{tknye"[nmsae,tp""ls""nm,itrae,src""yeaaee""aaee""aibe,poperty,euMme""cn,mto""ar""ewr""oiir,cmet,srn""ubr,rar,erra"bitn,lbl,kyodiea""no""pqe]"oeMdfes:"elrto""eiiin,raolai""erctd,asrc""sn""oiiain,dcmnain,dfutirr""eei"""}"ag"tu,fl"tru}"naHnPoie"tu,wrsae:"okpcFles:"upre"tu,cagNtfctos:re},sreIf"{nme""l""eso"".30}}otntLnt:9
"snp"".""d:2,"nl,err:"oe:360"esg""naiRquet,dt"nl}7

"
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:91)
	at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:113)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1583)

Since that looks like absolute gibberish, I opened process manager and sure enough, there were two instances of zls.exe running. After killing them both, everything started working fine.

I am not 100% sure that it was related, but I have no idea what else could produce that JSON abomination.

---

Zig: 0.13.0
ZLS: 0.13.0

IntelliJ IDEA 2024.2.3 (Community Edition)
Build #IC-242.23339.11, built on September 25, 2024
Runtime version: 21.0.4+13-b509.17 amd64 (JCEF 122.1.9)
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.awt.windows.WToolkit
Windows 10.0
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 8000M
Cores: 16
Registry:
debugger.new.tool.window.layout=true
ide.experimental.ui=true
i18n.locale=
Non-Bundled Plugins:
org.jetbrains.idea.grammar (2022.3.2)
be.jbeckers.compare_tab_with_editor2 (1.0.18)
com.darkyen.darkyenustimetracker (1.5.3)
PsiViewer (242.4697)
GLSL (1.24)
com.redhat.devtools.lsp4ij (0.6.0)
com.falsepattern.zigbrains (17.3.0-242)
String Manipulation (9.14.1)
BrowseWordAtCaret (3.0.5)
PythonCore (242.23339.11)
jclasslib (6.0.5.1)
net.seesharpsoft.intellij.plugins.csv (3.4.0-242)
23.bytecode-disassembler (1.0.10-beta1)
org.jetbrains.android (242.23339.11)
com.android.tools.design (242.23339.11)
uk.me.jeffsutton.restconsole (1.4)
Kotlin: 242.23339.11-IJ

[FalsePattern]

I have no idea what could cause this, it could've been just that weird restart state, but I'll keep this open for now.
Post a comment if it happens again and I'll investigate.

[angelozerr]

I have noticed that sometimes LSP4IJ doesn't kill correctly the started process. I have created an issue for that redhat-developer/lsp4ij#542