Hi. Can you provide backtrace from logcat?
A week ago I got similar error. I use UE4.27 from github
07-28 13:59:02.496 30045 30239 F libc : Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x97e72f64 in tid 30239 (RHIThread), pid 30045
07-28 13:59:02.675 30388 30388 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
07-28 13:59:02.675 30388 30388 F DEBUG : Build fingerprint:
07-28 13:59:02.675 30388 30388 F DEBUG : Revision: '0'
07-28 13:59:02.675 30388 30388 F DEBUG : ABI: 'arm'
07-28 13:59:02.675 30388 30388 F DEBUG : Timestamp: 2022-07-28 13:59:02+0300
07-28 13:59:02.675 30388 30388 F DEBUG : pid: 30045, tid: 30239, name: RHIThread >>> com..<<<
07-28 13:59:02.675 30388 30388 F DEBUG : uid: 10570
07-28 13:59:02.675 30388 30388 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x97e72f64
07-28 13:59:02.675 30388 30388 F DEBUG : r0 97e72f00 r1 000010c7 r2 b41bfda0 r3 00000000
07-28 13:59:02.675 30388 30388 F DEBUG : r4 d1e3952c r5 b41bfdac r6 b41bfda4 r7 00000000
07-28 13:59:02.675 30388 30388 F DEBUG : r8 00000001 r9 00000000 r10 b2a309d4 r11 b41bfdd0
07-28 13:59:02.675 30388 30388 F DEBUG : ip b2914534 sp b41bfd90 lr ac442d38 pc b1cef29c
00 pc 0afdd29c libUE4.so (FOpenGLDynamicRHI::OnVertexBufferDeletion(unsigned int)+752) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
01 pc 0b0bea68 libUE4.so (UE4Function_Private::TFunctionRefCaller<TOpenGLBuffer<FOpenGLBaseVertexBuffer, 34962u, &(CachedBindArrayBuffer(unsigned int))>::~TOpenGLBuffer()::'lambda'(), void ()>::Call(void*)+36) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
02 pc 0b022480 libUE4.so (FRHICommand<FRHICommandGLCommand, FRHICommandGLCommandString>::ExecuteAndDestruct(FRHICommandListBase&, FRHICommandListDebugContext&)+204) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
03 pc 06c9a330 libUE4.so (FRHICommandListExecutor::ExecuteInner_DoExecute(FRHICommandListBase&)+2348) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
04 pc 06cfb680 libUE4.so (FExecuteRHIThreadTask::DoTask(ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&)+888) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
05 pc 06cfad18 libUE4.so (TGraphTask<FExecuteRHIThreadTask>::ExecuteTask(TArray<FBaseGraphTask*, TSizedDefaultAllocator<32> >&, ENamedThreads::Type)+852) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
06 pc 0553647c libUE4.so (FNamedTaskThread::ProcessTasksNamedThread(int, bool)+2352) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
07 pc 055347f4 libUE4.so (FNamedTaskThread::ProcessTasksUntilQuit(int)+188) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
08 pc 06d84588 libUE4.so (FRHIThread::Run()+152) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
09 pc 05659e20 libUE4.so (FRunnableThreadPThread::Run()+164) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
10 pc 0552dc68 libUE4.so (FRunnableThreadPThread::_ThreadProc(void*)+84) (BuildId: 5a922ebdc24cf8cd161ceb420d6665f71ae95c62)
I found FOpenGLDynamicRHI::OnVertexBufferDeletion in the engine source code. It located in ...\UnrealEngine\Engine\Source\Runtime\OpenGLDrv\Private\OpenGLCommands.cpp
Then I used UE_LOG to find crash point. In the code below, I point to the crash point.
Also, I print the value CachedStream.VertexBuffer->Resource. Most of the time it has values like -572662307 and it strongly seems like trash. But it works some time (± 1 min) and then crashes randomly.
if ((ActiveStreamMask & 0x1) &&
CachedStream.VertexBuffer &&
CachedStream.VertexBuffer->Resource == VertexBufferResource) <==== CHASH HERE!!!
{
FOpenGL::BindVertexBuffer(StreamIndex, 0, 0, 0); // brianh@nvidia: work around driver bug 1809000
CachedStream.VertexBuffer = nullptr;
CachedStream.Offset = 0;
CachedStream.Stride = 0;
}
It seems like CachedStream.VertexBuffer starts to point to address out of app memory volume. And android shoots down app
If a have right understood. Please correct me.
I’ve not found a fix yet. This is a big problem for me(( If someone have updates, please share it.
If ill get updates or find fix, ill write here
Sorry for my lousy en…