2.6.0-alpha05 NavController visibleEntries flow contains many wrong entries [288520638]

Fixed

Bug

Status Update

No update yet.

Description

th...@outlook.com

created issue #1

Jun 23, 2023 12:30PM

Component used: Navigation
Version used: 2.6.0-alpha05 and up (including 2.6.0 stable)
Devices/Android versions reproduced on: Any

In the sample project I try to determine if the home fragment is visible using NavController.visibleEntries. In library version alpha04 it always contains the correct entries, but in alpha05 the list is a hot mess because it keeps growing when navigating and even the host fragment and fragments that are not on the backstack are added to the list. This is not possible in the sample project.

The sample project logs the information for demonstration.

VisibleEntriesBugReport.zip

148 KB

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Comments

il...@google.com <il...@google.com> Jun 23, 2023 10:07PM

Assigned to cl...@google.com.

th...@outlook.com <th...@outlook.com> #2Aug 30, 2023 09:57AM

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?

il...@google.com <il...@google.com> #3Aug 30, 2023 04:52PM

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

ap...@google.com <ap...@google.com> #4Sep 7, 2023 05:19PM

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.

cl...@google.com <cl...@google.com> #5Sep 7, 2023 05:25PM

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.

na...@google.com <na...@google.com> #6Sep 20, 2023 07:16PM

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)

th...@outlook.com <th...@outlook.com> #7Sep 21, 2023 08:48AM

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!

na...@google.com <na...@google.com> #8Jan 24, 2024 07:53PM

Thank you, I'll try it and check.