Native Crash (SIGSEGV) when SerializersModule includes Polymorphic Type with Recursive List

[ashish967]

experiencing a native crash (SIGSEGV) in our KMM application when using Zipline. The crash appears to be related to the registration of a specific polymorphic type (ColumnLayout) in the SerializersModule. This ColumnLayout contains a List where Widget is the polymorphic base interface, thus introducing a recursive polymorphic structure.

Steps to Reproduce:

import kotlinx.serialization.*
import kotlinx.serialization.modules.*

@Serializable
sealed interface Widget {
    val id: String?
}

@Serializable
@SerialName("text_widget")
data class TextWidget(
    val text: String,
    override val id: String? = null
) : Widget

@Serializable
@SerialName("column_layout")
data class ColumnLayout(
    val children: List<Widget>, // This field seems critical to the issue
    override val id: String? = null
) : Widget

// SerializersModule including the problematic ColumnLayout
val appSerializersModule = SerializersModule {
    polymorphic(Widget::class) {
        subclass(TextWidget::class)
        subclass(ColumnLayout::class) // Registering this is key to reproducing the crash
    }
}

@Serializable
data class PageData(
    val widget: Widget
)

// in zipline service
fun getPageState():Flow<PageState>

My observations -

1. if remove column layout class from code then it starts working
2. if I remove just subclass(ColumnLayout::class) and keep the ColumnLayout class then also crash happpens
3. if I remove Flow as return type instead direct return PageState object then it starts working
4. in above 3 case m returning PageState(TextWidget("a","b")) in service impl.

Crash log -

fatal signal 11 (SIGSEGV), code 2 (SEGV_ACCERR), fault addr 0x75801d0ffc in tid 26106 (Zipline), pid 26085 (testing.android)
2025-05-29 03:27:10.526 26123-26123 DEBUG                   pid-26123                            A  Cmdline: com.hyperboot.ziplinekmmtesting.android
2025-05-29 03:27:10.526 26123-26123 DEBUG                   pid-26123                            A  pid: 26085, tid: 26106, name: Zipline  >>> com.hyperboot.ziplinekmmtesting.android <<<
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #00 pc 00000000000552ec  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+588) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #01 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #02 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #03 pc 0000000000096248  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (js_function_call+84) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #04 pc 0000000000049ea4  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (js_call_c_function+240) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #05 pc 000000000005539c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+764) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #06 pc 00000000000563b8  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4888) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #07 pc 000000000005d1a4  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallConstructorInternal+272) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.527 26123-26123 DEBUG                   pid-26123                            A        #08 pc 00000000000562fc  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4700) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.528 26123-26123 DEBUG                   pid-26123                            A        #09 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.528 26123-26123 DEBUG                   pid-26123                            A        #10 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.528 26123-26123 DEBUG                   pid-26123                            A        #11 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.528 26123-26123 DEBUG                   pid-26123                            A        #12 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.528 26123-26123 DEBUG                   pid-26123                            A        #13 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.528 26123-26123 DEBUG                   pid-26123                            A        #14 pc 000000000005622c  /data/app/~~cB92TfEYe4dVgLm3zNwB2Q==/com.hyperboot.ziplinekmmtesting.android-8vslgtGdF3wyOhEW2nkNFQ==/base.apk!libquickjs.so (offset 0x74000) (JS_CallInternal+4492) (BuildId: f905318366a13fac3eb8aae888c542cd07ede18b)
2025-05-29 03:27:10.528 26123-26123 DEBUG                   pid-26123                            A        #15