App crash :Cause: null pointer dereference

[iningwei]

error stack trace as follows:

[iningwei]

2021-10-08 18:33:26.243 1653-1727/? E/AndroidRuntime: FATAL EXCEPTION: UnityMain
Process: com.tj.sgame, PID: 1653
java.lang.Error: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
Version '2020.3.0f1 (c7b5465681fb)', Build type 'Release', Scripting Backend 'il2cpp', CPU 'armeabi-v7a'
Build fingerprint: 'Redmi/dandelion/dandelion:10/QP1A.190711.020/V12.0.13.0.QCDCNXM:user/release-keys'
Revision: '0'
ABI: 'arm'
Timestamp: 2021-10-08 18:33:25+0800
pid: 1653, tid: 1906, name: Thread-6 >>> com.tj.sgame <<<
uid: 10328
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4
Cause: null pointer dereference
r0 00000004 r1 a67403c8 r2 00000004 r3 a6740411
r4 00000000 r5 a67403c8 r6 a67403c8 r7 00000004
r8 a6740411 r9 cae1c518 r10 00000004 r11 00000000
ip a6977c64 sp a6740358 lr a68a575f pc ec3cdaea

backtrace:
      #00 pc 000a6aea  /apex/com.android.runtime/lib/bionic/libc.so (pthread_mutex_lock+6) (BuildId: af31ec96b35fedca378e07659b30896c)
      #01 pc 0016075b  /data/app/com.tj.sgame-Kv8VLP-eFvtV9_GhowUt_A==/lib/arm/libFirebaseCppApp-8_3_0.so (firebase::Mutex::Acquire()+2) (BuildId: 2c21ad884429159a0aac3a7344d9d016)
      #02 pc 00163eed  /data/app/com.tj.sgame-Kv8VLP-eFvtV9_GhowUt_A==/lib/arm/libFirebaseCppApp-8_3_0.so (void firebase::ReferenceCountedFutureImpl::CompleteInternal<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, void firebase::ReferenceCountedFutureImpl::CompleteWithResultInternal<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >(firebase::FutureHandle const&, int, char const*, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&)::'lambda'(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >*)>(firebase::FutureHandle const&, int, char const*, void firebase::ReferenceCountedFutureImpl::CompleteWithResultInternal<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >(firebase::FutureHandle const&, int, char const*, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, ...
      #03 pc 00163ecd  /data/app/com.tj.sgame-Kv8VLP-eFvtV9_GhowUt_A==/lib/arm/libFirebaseCppApp-8_3_0.so (void firebase::ReferenceCountedFutureImpl::CompleteWithResultInternal<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >(firebase::FutureHandle const&, int, char const*, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&)+32) (BuildId: 2c21ad884429159a0aac3a7344d9d016)
      #04 pc 001b74ad  /data/app/com.tj.sgame-Kv8VLP-eFvtV9_GhowUt_A==/lib/arm/libFirebaseCppApp-8_3_0.so (firebase::messaging::CompleteStringCallback(_JNIEnv*, _jobject*, firebase::util::FutureResult, char const*, void*)+96) (BuildId: 2c21ad884429159a0aac3a7344d9d016)
      #05 pc 001c89e9  /data/app/com.tj.sgame-Kv8VLP-eFvtV9_GhowUt_A==/lib/arm/libFirebaseCppApp-8_3_0.so (firebase::util::JniResultCallback_nativeOnResult(_JNIEnv*, _jobject*, _jobject*, unsigned char, unsigned char, _jstring*, long long, long long)+116) (BuildId: 2c21ad884429159a0aac3a7344d9d016)
      #06 pc 000dc519  /apex/com.android.runtime/lib/libart.so (art_quick_generic_jni_trampoline+40) (BuildId: 04997b3570c346f812675714d1681c80)
      #07 pc 000d7bc5  /apex/com.android.runtime/lib/libart.so (art_quick_invoke_stub_internal+68) (BuildId: 04997b3570c346f812675714d1681c80)
      #08 pc 0042e457  /apex/com.android.runtime/lib/libart.so (art_quick_invoke_stub+250) (BuildId: 04997b3570c346f812675714d1681c80)
      #09 pc 000dffb7  /apex/com.android.runtime/lib/libart.so (art::ArtMethod::Invoke(art::Thread*, unsigned int*, unsigned int, art::JValue*, char const*)+174) (BuildId: 04997b3570c346f812675714d1681c80)

[iningwei]

The app integrated FirebaseAnalytics and FirebaseMessaging SDK.
After lots test i can get some clues:
step1:install app, close vpn, after app launchs it crashed and error logs as upper shown. Launch app again,and it crashed either.
step2:open vpn, launch app, now the app not crash and get fcm token success.
step3:close vpn, launch app, not crash.
Judge from step2 and step3 ,i guess while the app try to get token from server, if i do not open vpn ,it crashed.After get token, it will not get token again,so step3 not crash.

I am living in a country where google url is banned, so we need vpn to use google products.

[iningwei]

So Firebase developers,please help me!!!
By the way, we used firebase sdk for unity3d v8.3.0. Mobile device is XiaoMi(Redme)

[iningwei]

I used another mobie device Huawei P9, it crash either.
After i used vpn, it do not crash any long.

[dconeybe]

Note that this is a duplicate of firebase/quickstart-unity#1155

[iningwei]

Note that this is a duplicate of firebase/quickstart-unity#1155

yes, both created by me in case of your guys ignored the bug.