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"UniFFI API checksum mismatch" in LWK bindings on armeabi-v7a #317

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Open
"UniFFI API checksum mismatch" in LWK bindings on armeabi-v7a#317
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ardier16
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bugSomething isn't workingstatus: confirmedReproduced or otherwise confirmed by maintainers.

Description

@willpubissues
willpubissues
opened on Oct 19, 2026

Title

Crash at login on 32-bit ARM (armeabi-v7a): "UniFFI API checksum mismatch" in LWK bindings

Summary

The app crashes immediately when logging in (PIN) on a 32-bit ARM device. The crash comes from the LWK UniFFI integrity check failing when LwkNetworkBackend calls lwk.Network.mainnet(). The same wallet type works on a 64-bit (arm64-v8a) device.

This looks like the known gobley 0.3.7 bug on 32-bit ARM Android (gobley/gobley#252). It was fixed in LWK on 2026-10-09 (Blockstream/lwk@22659e7), but that fix is still listed as "Unreleased" in LWK's changelog. Green currently depends on LWK 0.19.0.

Environment

  • App: Blockstream App (Green), com.greenaddress.greenbits_android_wallet, version [5.7.0] from Play Store
  • Device: Xiaomi Redmi A1 (MediaTek Helio A22), Android 12 Go edition
  • ABI: armeabi-v7a (ro.product.cpu.abilist = armeabi-v7a,armeabi
  • Works on: Xiaomi Redmi 12 (arm64-v8a)

Steps to reproduce

  1. Install the app on a 32-bit ARM (armeabi-v7a) device.
  2. Let the app be AOT-compiled (Play cloud profile at install, or background dexopt).
  3. Open or create a wallet with pin
  4. The app crashes.

Expected

Login succeeds.

Actual

Fatal crash:

java.lang.ExceptionInInitializerError
  at lwk.UniffiLib.<clinit>
  at lwk.Network$Companion.mainnet
  at com.blockstream.data.backend.lwk.LwkNetworkBackend.<init>
  at com.blockstream.data.gdk.GdkSession.initNetworkBackends
  at com.blockstream.data.gdk.GdkSession.connect
  at com.blockstream.data.gdk.GdkSession.loginWithLoginCredentials
  at com.blockstream.compose.models.login.LoginViewModel$loginWithPinOrMnemonic$1.invokeSuspend
  ...
Caused by: java.lang.RuntimeException: UniFFI API checksum mismatch: try cleaning and rebuilding your project
  at lwk.IntegrityCheckingUniffiLib.uniffiCheckApiChecksums
  at lwk.IntegrityCheckingUniffiLib.<clinit>
Full logcat 
--------  5805  5805 E AndroidRuntime: FATAL EXCEPTION: main
--------  5805  5805 E AndroidRuntime: Process: com.greenaddress.greenbits_android_wallet, PID: 5805
--------  5805  5805 E AndroidRuntime: java.lang.ExceptionInInitializerError
--------  5805  5805 E AndroidRuntime:  at lwk.UniffiLib.<clinit>(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:8)
--------  5805  5805 E AndroidRuntime:  at lwk.Network$Companion$mainnet$$inlined$uniffiRustCall$1.invoke(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:4)
--------  5805  5805 E AndroidRuntime:  at lwk.Network$Companion$mainnet$$inlined$uniffiRustCall$1.invoke(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:14)
--------  5805  5805 E AndroidRuntime:  at lwk.UniffiRustCallStatusHelper.withReference$lib(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:9)
--------  5805  5805 E AndroidRuntime:  at lwk.Network$Companion.mainnet(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:12)
--------  5805  5805 E AndroidRuntime:  at com.blockstream.data.backend.lwk.LwkNetworkBackend.<init>(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:40)
--------  5805  5805 E AndroidRuntime:  at com.blockstream.data.gdk.GdkSession.initNetworkBackends(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:220)
--------  5805  5805 E AndroidRuntime:  at com.blockstream.data.gdk.GdkSession.connect(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:153)
--------  5805  5805 E AndroidRuntime:  at com.blockstream.data.gdk.GdkSession.loginWithLoginCredentials(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:27)
--------  5805  5805 E AndroidRuntime:  at com.blockstream.data.gdk.GdkSession.loginWithLoginCredentials$default(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:113)
--------  5805  5805 E AndroidRuntime:  at com.blockstream.data.gdk.GdkSession.loginWithWallet(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:94)
--------  5805  5805 E AndroidRuntime:  at com.blockstream.compose.models.login.LoginViewModel$loginWithPinOrMnemonic$1.invokeSuspend(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:126)
--------  5805  5805 E AndroidRuntime:  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:11)
--------  5805  5805 E AndroidRuntime:  at kotlinx.coroutines.DispatchedTask.run(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:127)
--------  5805  5805 E AndroidRuntime:  at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:1)
--------  5805  5805 E AndroidRuntime:  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:62)
--------  5805  5805 E AndroidRuntime:  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:29)
--------  5805  5805 E AndroidRuntime:  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:1)
--------  5805  5805 E AndroidRuntime:  Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@7dbae6d, Dispatchers.Main.immediate]
--------  5805  5805 E AndroidRuntime: Caused by: java.lang.RuntimeException: UniFFI API checksum mismatch: try cleaning and rebuilding your project
--------  5805  5805 E AndroidRuntime:  at ge.g(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:3)
--------  5805  5805 E AndroidRuntime:  at lwk.IntegrityCheckingUniffiLib.uniffiCheckApiChecksums(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:992)
--------  5805  5805 E AndroidRuntime:  at lwk.IntegrityCheckingUniffiLib.<clinit>(r8-map-id-eba37adec517341ce9f8432a2a824f7221e62e373e383229433fbb9433ed751f:22)
--------  5805  5805 E AndroidRuntime:  ... 18 more

Analysis

  • gradle/libs.versions.toml pins blockstream-lwk = "0.19.0".
  • LWK's Kotlin bindings are generated with gobley 0.3.7. It declares the u16 returns of the uniffi_lwk_checksum_* functions as Short with JNA direct mapping. Rust zero-extends the value. ART's compiled JNI stubs on 32-bit ARM don't re-extend small return values, so after AOT compilation the checksum read on armeabi-v7a is wrong and uniffiCheckApiChecksums throws. arm64 is unaffected.
  • LWK fixed this by generating the bindings with a patched gobley (lwk@22659e7, upstream PR Read unsigned 8/16-bit direct-mapped returns as Int on JVM and Android gobley/gobley#297). The fix is not in 0.19.0 or 0.19.1.
  • glsdk (Greenlight) uses the same generator and recently added the same workaround in build/.tasks.yml. glsdk 0.3.0 may therefore also be affected on 32-bit ARM, for example in Lightning flows.
  • Ruled out: duplicate liblwk.so hidden by packaging.jniLibs.pickFirsts("**/*.so"). GDK 0.78.0 ships only libgreen_gdk_java.so and exports no UniFFI or LWK symbols. glsdk ships libglsdk.

Suggested fix

  • Bump LWK to the first release containing lwk@22659e7, and glsdk to a release built with the patched gobley.
  • Possible interim mitigation: android:vmSafeMode="true" in the manifest to prevent AOT compilation, at some performance cost. Dropping armeabi-v7a would instead lock out existing 32-bit users.

Verified workaround

Resetting the app to non-AOT code may avoid the crash without touching wallet data:

adb shell cmd package compile -m verify -f com.greenaddress.greenbits_android_wallet

Background dexopt will likely re-compile the app later, bringing the crash back.

Activity

  1. willpubissues commented on Oct 19, 2026

    @willpubissues
    willpubissues
    on Oct 19, 2026
    Author

    Looks like its already in the pipeline to be fixed, but the workaround maybe useful for others like me

  2. willpubissues
    changed the title [-]UniFFI API checksum mismatch Crash on opening wallet on armeabi-v7a[/-] [+]"UniFFI API checksum mismatch" in LWK bindings on armeabi-v7a[/+] on Oct 19, 2026

  3. ardier16 commented on Oct 19, 2026

    @ardier16
    ardier16
    on Oct 19, 2026
    Contributor

    @willpubissues thanks for the detailed report and investigation! We’re aware of this crash and have already pushed a fix that will be available in the next release. We’ll let you know when it’s out.

    It would be helpful if you could test the update on your Redmi A1 once it’s available and let us know whether it resolves the crash.

  4. ardier16
    self-assigned this
    on Oct 19, 2026
  5. ardier16
    added
    bugSomething isn't working
    status: confirmedReproduced or otherwise confirmed by maintainers.
    on Oct 19, 2026

  6. willpubissues commented on Oct 19, 2026

    @willpubissues
    willpubissues
    on Oct 19, 2026 via email
    Author
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