NavHost does not render any destination in first composition pass [304852206]

Fixed

Bug

Status Update

No update yet.

Description

va...@google.com

created issue #1

Oct 12, 2023 12:02AM

Component used: navigation-compose Version used: 2.7.4

Compose components are generally expected to be able to display themselves on the initial composition, without requiring a second composition.

Right now, NavHost doesn't follow this expectation: on the first composition, NavHost won't display anything, and will only display a destination on the second and subsequent compositions. One additional consequence is that each nested NavHost will lose another frame until it resolves to display the current destination.

This is sort of related to b/253654317 - the reason it works for @Preview now is from special handling when LocalInspectionMode.current is true. If it worked directly on the first composition pass, it should work in previews directly without needing the LocalInspectionMode.current special handling.

Comments

jb...@google.com <jb...@google.com> #2Oct 13, 2023 09:45PM

Status: Assigned (reopened)

A couple of questions:

1. Have you saw crash in real device or only in simulators?
2. Do you use dynamic feature for language ID?

jb...@google.com <jb...@google.com> #3Oct 13, 2023 09:58PM

Tested on Android 12 Emulator with custom executor, but cannot repro this issue.

ap...@google.com <ap...@google.com> #4Oct 16, 2023 07:10PM

Second crash in the description is from a real device. Experienced it myself on two different Xiaomi phones, plus lots of crashes from users in the Google Play console.
Dynamic features are not used in the application.

As a wild guess, I have downgraded build tools from 31.0.0 to 30.0.3, compileSdk from 31 to 30, and moved all work with Language ID to the service in a separate process (just to be sure that crash can kill secondary process instead of main). This combination is in beta for 2 days by now and I don't see any SIGSEGV crashes.

jb...@google.com <jb...@google.com> #5Oct 16, 2023 07:28PM

Marked as fixed.

Hmm, I feel the crash might be something related to separate/secondary process.

I also changed compileSdk and targetSDK to 31 but still cannot repro this issue.

Message last modified on Oct 16, 2023 07:33PM

na...@google.com <na...@google.com> #6Nov 1, 2023 05:20PM

On the contrary, there was no separate process before, when crashes started.

In the new build (with the aforementioned changes) I can see SIGSEGV crash, but only one instead of dozens and it has a bit different backtrace:

signal 11 (SIGSEGV), code 1 (SEGV_MAPERR)
liblanguage_id_jni.so (offset 0x11e000)

backtrace:
  #00  pc 000000000003c7c0  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/split_config.arm64_v8a.apk!lib/arm64-v8a/liblanguage_id_jni.so (offset 0x11e000)
  #00  pc 000000000003b960  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/split_config.arm64_v8a.apk!lib/arm64-v8a/liblanguage_id_jni.so (offset 0x11e000)
  #00  pc 000000000003bb48  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/split_config.arm64_v8a.apk!lib/arm64-v8a/liblanguage_id_jni.so (offset 0x11e000)
  #00  pc 000000000003bafc  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/split_config.arm64_v8a.apk!lib/arm64-v8a/liblanguage_id_jni.so (offset 0x11e000)
  #00  pc 0000000000036c98  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/split_config.arm64_v8a.apk!lib/arm64-v8a/liblanguage_id_jni.so (offset 0x11e000)
  #00  pc 0000000000032714  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/split_config.arm64_v8a.apk!lib/arm64-v8a/liblanguage_id_jni.so (offset 0x11e000)
  #00  pc 0000000000031cac  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/split_config.arm64_v8a.apk!lib/arm64-v8a/liblanguage_id_jni.so (offset 0x11e000)
  #00  pc 0000000000057438  /data/app/azagroup.reedy-mF7zTu2bv_ELlbFArwNgqA==/oat/arm64/base.odex (offset 0x57000)

na...@google.com <na...@google.com> #7Jan 24, 2024 07:53PM

FYI, ML Kit launched a new language ID SDK in the latest release, which uses a new language ID model. https://developers.google.com/ml-kit/release-notes#august_11_2021

Could you try the new SDK version(17.0.0) to check if you can still repro this native crash? Thanks!

Issue 304852206