CoroutinesInternalError: Fatal exception in coroutines machinery for DispatchedContinuation

[rohandhruva]

We use coroutines in our Android app, and recently we've started to see crashes from what looks like the internal coroutines machinery.

kotlinx.coroutines.CoroutinesInternalError: Fatal exception in coroutines machinery for DispatchedContinuation[Dispatchers.Main, Continuation at com.app.myapp.widget.CustomTextView$getMeasuredSpannable$2@d593f0e]. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
        at kotlinx.coroutines.DispatchedTask.handleFatalException$kotlinx_coroutines_core(DispatchedTask:144)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask:115)
        at android.os.Handler.handleCallback(Handler.java:793)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:173)
        at android.app.ActivityThread.main(ActivityThread.java:6698)
        at java.lang.reflect.Method.invoke(Method.java:-2)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:782)

Caused by: java.lang.StackOverflowError: stack size 8MB

Full stack trace is here: https://gist.github.com/rohandhruva/d7a3d92244fd8ae1a592ab6e4211ca41

Few more crashes in the same crash cluster: https://gist.github.com/rohandhruva/b62ee9e79cfce45fc40ea8fd12fe5052
https://gist.github.com/rohandhruva/966139a91a3bc652c4d848a3c9cb3321

It looks like the crash happens when some internal code is trying to build a string for easier debugging. As you can see, some stack traces do go all the way up to CoroutinesInternalError, but some crash earlier with a StackOverflowError.

Versions:

org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10
org.jetbrains.kotlin:kotlin-stdlib:1.4.10
org.jetbrains.kotlin:kotlin-stdlib-common:1.4.10
org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.4.10
org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1
org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.1

We've not been able to get a standalone reproducer so far, but I'm still working on it. I'll also share the pseudo code of what we do in the custom widget in just a bit.

[mhernand40]

Possible dupe of #2371?

[rohandhruva]

Thank you, @mhernand40 : it does look like a duplicate :) Looks like upgrading to 1.4.2 should fix this issue for us.