For now

src/coreclr/pal/src/thread/process.cpp

@@ -1153,6 +1153,9 @@ ExitProcess(
         else
         {
             WARN("thread re-called ExitProcess\n");
+#if defined(TARGET_ANDROID)
+            __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
             PROCEndProcess(GetCurrentProcess(), uExitCode, FALSE);
         }
     }
@@ -1177,6 +1180,9 @@ ExitProcess(
     */
     if (PALInitLock() && PALIsInitialized())
     {
+#if defined(TARGET_ANDROID)
+        __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
         PROCEndProcess(GetCurrentProcess(), uExitCode, FALSE);
 
         /* Should not get here, because we terminate the current process */
@@ -1214,7 +1220,9 @@ TerminateProcess(
 
     PERF_ENTRY(TerminateProcess);
     ENTRY("TerminateProcess(hProcess=%p, uExitCode=%u)\n",hProcess, uExitCode );
-
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
     ret = PROCEndProcess(hProcess, uExitCode, TRUE);
 
     LOGEXIT("TerminateProcess returns BOOL %d\n", ret);
@@ -1239,6 +1247,9 @@ RaiseFailFastException(
     PERF_ENTRY(RaiseFailFastException);
     ENTRY("RaiseFailFastException");
 
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "About to abort at %s:%u", __FILE_NAME__, __LINE__);
+#endif
     TerminateCurrentProcessNoExit(TRUE);
     for (;;) PROCAbort();
 
@@ -1318,6 +1329,9 @@ static BOOL PROCEndProcess(HANDLE hProcess, UINT uExitCode, BOOL bTerminateUncon
             // (2) can invoke CrashReporter or produce a coredump, which is appropriate for TerminateProcess calls
             // TerminationRequestHandlingRoutine in synchmanager.cpp sets the exit code to this special value. The
             // Watson analyzer needs to know that the process was terminated with a SIGTERM.
+#if defined(TARGET_ANDROID)
+            __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "About to abort in %s:%u", __FILE_NAME__, __LINE__);
+#endif
             PROCAbort(uExitCode == (128 + SIGTERM) ? SIGTERM : SIGABRT);
         }
         else
@@ -2620,12 +2634,18 @@ InitializeFlushProcessWriteBuffers()
 #endif // TARGET_APPLE
 }
 
+#if defined(TARGET_ANDROID)
+#define FATAL_ASSERT_PRINT(msg) __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "About to abort in %s:%u. %s", __FILE_NAME__, __LINE__, (msg))
+#else
+#define FATAL_ASSERT_PRINT(msg) fprintf(stderr, "FATAL ERROR: " msg)
+#endif
+
 #define FATAL_ASSERT(e, msg) \
     do \
     { \
         if (!(e)) \
         { \
-            fprintf(stderr, "FATAL ERROR: " msg); \
+            FATAL_ASSERT_PRINT(msg); \
             PROCAbort(); \
         } \
     } \

src/coreclr/vm/eepolicy.cpp

@@ -20,6 +20,10 @@
 #include "dwreport.h"
 #endif // !TARGET_UNIX
 
+#if defined(TARGET_ANDROID)
+#include <android/log.h>
+#endif
+
 #include "eventtrace.h"
 #undef ExitProcess
 
@@ -58,7 +62,9 @@ void SafeExitProcess(UINT exitCode, ShutdownCompleteAction sca = SCA_ExitProcess
     {
         // disabled because if we fault in this code path we will trigger our Watson code
         CONTRACT_VIOLATION(ThrowsViolation);
-
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
         CrashDumpAndTerminateProcess(exitCode);
     }
     else if (sca == SCA_ExitProcessWhenShutdownComplete)
@@ -737,7 +743,9 @@ void DECLSPEC_NORETURN EEPolicy::HandleFatalStackOverflow(EXCEPTION_POINTERS *pE
         WatsonLastChance(pThread, pExceptionInfo,
             (fTreatAsNativeUnhandledException == FALSE)? TypeOfReportedError::UnhandledException: TypeOfReportedError::NativeThreadUnhandledException);
     }
-
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
     CrashDumpAndTerminateProcess(COR_E_STACKOVERFLOW);
     UNREACHABLE();
 }

src/coreclr/vm/excep.cpp

@@ -25,6 +25,10 @@
 #include "virtualcallstub.h"
 #include "typestring.h"
 
+#if defined(TARGET_ANDROID)
+#include <android/log.h>
+#endif
+
 #ifndef TARGET_UNIX
 #include "dwreport.h"
 #endif // !TARGET_UNIX
@@ -3944,6 +3948,9 @@ void CrashDumpAndTerminateProcess(UINT exitCode)
 {
 #ifdef HOST_WINDOWS
     CreateCrashDumpIfEnabled(exitCode == COR_E_STACKOVERFLOW);
+#endif
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
 #endif
     TerminateProcess(GetCurrentProcess(), exitCode);
 }
@@ -4074,6 +4081,9 @@ LONG UserBreakpointFilter(EXCEPTION_POINTERS* pEP)
     }
 
     // Otherwise, we terminate the process.
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
     CrashDumpAndTerminateProcess(STATUS_BREAKPOINT);
 
     // Shouldn't get here ...

src/coreclr/vm/exceptionhandling.cpp

@@ -21,6 +21,10 @@
 #include "exinfo.h"
 #include "configuration.h"
 
+#if defined(TARGET_ANDROID)
+#include <android/log.h>
+#endif
+
 #if defined(TARGET_X86)
 #define USE_CURRENT_CONTEXT_IN_FILTER
 #endif // TARGET_X86
@@ -4902,6 +4906,9 @@ VOID DECLSPEC_NORETURN UnwindManagedExceptionPass1(PAL_SEHException& ex, CONTEXT
                     LONG disposition = InternalUnhandledExceptionFilter_Worker(&ex.ExceptionPointers);
                     _ASSERTE(disposition == EXCEPTION_CONTINUE_SEARCH);
                 }
+#if defined(TARGET_ANDROID)
+                __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
                 CrashDumpAndTerminateProcess(1);
             }
             else
@@ -4961,6 +4968,9 @@ VOID DECLSPEC_NORETURN UnwindManagedExceptionPass1(PAL_SEHException& ex, CONTEXT
                     LONG disposition = InternalUnhandledExceptionFilter_Worker(&ex.ExceptionPointers);
                     _ASSERTE(disposition == EXCEPTION_CONTINUE_SEARCH);
                 }
+#if defined(TARGET_ANDROID)
+                __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
                 CrashDumpAndTerminateProcess(1);
                 UNREACHABLE();
             }
@@ -5029,6 +5039,9 @@ VOID DECLSPEC_NORETURN DispatchManagedException(PAL_SEHException& ex, bool isHar
                     // There are no managed frames on the stack, so the exception was not handled
                     LONG disposition = InternalUnhandledExceptionFilter_Worker(&ex.ExceptionPointers);
                     _ASSERTE(disposition == EXCEPTION_CONTINUE_SEARCH);
+#if defined(TARGET_ANDROID)
+                    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
                     CrashDumpAndTerminateProcess(1);
                     UNREACHABLE();
                 }
@@ -5908,7 +5921,7 @@ void FixupDispatcherContext(DISPATCHER_CONTEXT* pDispatcherContext, CONTEXT* pCo
     }
 
     pDispatcherContext->ControlPc = (UINT_PTR) GetIP(pDispatcherContext->ContextRecord);
-    
+
 #if defined(TARGET_ARM64)
     // Since this routine is used to fixup contexts for async exceptions,
     // clear the CONTEXT_UNWOUND_TO_CALL flag since, semantically, frames
@@ -8496,6 +8509,9 @@ extern "C" bool QCALLTYPE SfiInit(StackFrameIterator* pThis, CONTEXT* pStackwalk
         GetThread()->SetThreadStateNC(Thread::TSNC_ProcessedUnhandledException);
         RaiseException(pExInfo->m_ExceptionCode, EXCEPTION_NONCONTINUABLE_EXCEPTION, pExInfo->m_ptrs.ExceptionRecord->NumberParameters, pExInfo->m_ptrs.ExceptionRecord->ExceptionInformation);
 #else
+#if defined(TARGET_ANDROID)
+        __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
         CrashDumpAndTerminateProcess(pExInfo->m_ExceptionCode);
 #endif
     }
@@ -8615,6 +8631,9 @@ extern "C" bool QCALLTYPE SfiNext(StackFrameIterator* pThis, uint* uExCollideCla
                     GetThread()->SetThreadStateNC(Thread::TSNC_ProcessedUnhandledException);
                     RaiseException(pTopExInfo->m_ExceptionCode, EXCEPTION_NONCONTINUABLE_EXCEPTION, pTopExInfo->m_ptrs.ExceptionRecord->NumberParameters, pTopExInfo->m_ptrs.ExceptionRecord->ExceptionInformation);
 #else
+#if defined(TARGET_ANDROID)
+                    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
                     CrashDumpAndTerminateProcess(pTopExInfo->m_ExceptionCode);
 #endif
                 }

src/coreclr/vm/jithelpers.cpp

@@ -25,6 +25,10 @@
 #include "dynamicinterfacecastable.h"
 #include "comsynchronizable.h"
 
+#if defined(TARGET_ANDROID)
+#include <android/log.h>
+#endif
+
 #ifndef TARGET_UNIX
 // Included for referencing __report_gsfailure
 #include "process.h"
@@ -2016,7 +2020,9 @@ void DoJITFailFast ()
                        COR_E_EXECUTIONENGINE,
                        GetClrInstanceId());
     }
-
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "End process at %s:%u", __FILE_NAME__, __LINE__);
+#endif
     CrashDumpAndTerminateProcess(STATUS_STACK_BUFFER_OVERRUN);
 #endif // !TARGET_UNIX
 }

src/libraries/Common/src/Interop/Unix/System.Native/Interop.Stat.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
+using System.Diagnostics;
 using System.Runtime.InteropServices;
 using Microsoft.Win32.SafeHandles;
 
@@ -63,5 +64,15 @@ internal enum FileStatusFlags
 
         [LibraryImport(Libraries.SystemNative, EntryPoint = "SystemNative_LStat", StringMarshalling = StringMarshalling.Utf8, SetLastError = true)]
         internal static partial int LStat(string path, out FileStatus output);
+
+        [LibraryImport("log", EntryPoint="__android_log_write", StringMarshalling = StringMarshalling.Utf8, SetLastError = false)]
+        static partial void AndroidLog (int prio, string tag, string message);
+
+        internal static int LStatWrap(string path, out FileStatus output)
+        {
+            AndroidLog (4, "CoreCLR", $"LStat (\"{path}\"");
+            AndroidLog (4, "CoreCLR", new StackTrace (false).ToString ());
+            return LStat (path, out output);
+        }
     }
 }

src/libraries/System.Diagnostics.FileVersionInfo/src/System.Diagnostics.FileVersionInfo.csproj

@@ -57,6 +57,7 @@
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'unix'">
     <Reference Include="System.Collections.Immutable" />
     <Reference Include="System.Reflection.Metadata" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
 </Project>

src/libraries/System.Diagnostics.Process/src/System.Diagnostics.Process.csproj

@@ -387,6 +387,7 @@
     <Reference Include="System.Threading" />
     <Reference Include="System.Threading.Thread" />
     <Reference Include="System.Threading.ThreadPool" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
 </Project>

src/libraries/System.Formats.Tar/src/System.Formats.Tar.csproj

@@ -79,6 +79,7 @@
     <Reference Include="System.Runtime" />
     <Reference Include="System.Runtime.InteropServices" />
     <Reference Include="System.Threading" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
 </Project>

src/libraries/System.IO.Compression.ZipFile/src/System.IO.Compression.ZipFile.csproj

@@ -49,6 +49,7 @@
     <Reference Include="System.Memory" />
     <Reference Include="System.Runtime" />
     <Reference Include="System.Runtime.InteropServices" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
 </Project>

src/libraries/System.IO.Compression/src/System.IO.Compression.csproj

@@ -78,6 +78,7 @@
     <Reference Include="System.Runtime" />
     <Reference Include="System.Runtime.InteropServices" />
     <Reference Include="System.Threading" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
 </Project>

src/libraries/System.IO.FileSystem.Watcher/src/System.IO.FileSystem.Watcher.csproj

@@ -128,6 +128,7 @@
     <Reference Include="System.Runtime.InteropServices" />
     <Reference Include="System.Threading" />
     <Reference Include="System.Threading.Overlapped" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' != '' and '$(TargetPlatformIdentifier)' != 'windows'">

src/libraries/System.IO.MemoryMappedFiles/src/System.IO.MemoryMappedFiles.csproj

@@ -133,6 +133,7 @@
     <Reference Include="System.Runtime.InteropServices" />
     <Reference Include="System.Threading" />
     <Reference Include="System.Threading.Thread" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
 </Project>

src/libraries/System.IO.Pipes/src/System.IO.Pipes.csproj

@@ -194,6 +194,7 @@
     <Reference Include="Microsoft.Win32.Primitives" />
     <Reference Include="System.Net.Primitives" />
     <Reference Include="System.Net.Sockets" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
 </Project>

src/libraries/System.Net.Sockets/src/System.Net.Sockets.csproj

@@ -316,6 +316,7 @@
     <Reference Include="System.Threading" />
     <Reference Include="System.Threading.Overlapped" />
     <Reference Include="System.Threading.ThreadPool" />
+    <Reference Include="System.Diagnostics.StackTrace" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' != 'windows'">

src/libraries/System.Private.CoreLib/src/System/IO/FileSystem.Exists.Unix.cs

@@ -46,7 +46,7 @@ private static bool FileExists(ReadOnlySpan<char> fullPath, out Interop.ErrorInf
             // See http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_11 for details.
             fullPath = Path.TrimEndingDirectorySeparator(fullPath);
 
-            if (Interop.Sys.LStat(fullPath, out fileinfo) < 0)
+            if (Interop.Sys.LStatWrap(fullPath.ToString (), out fileinfo) < 0)
             {
                 errorInfo = Interop.Sys.GetLastErrorInfo();
                 return false;

src/libraries/System.Private.CoreLib/src/System/IO/FileSystem.Unix.cs

@@ -123,7 +123,7 @@ public static void ReplaceFile(string sourceFullPath, string destFullPath, strin
         {
             // Unix rename works in more cases, we limit to what is allowed by Windows File.Replace.
             // These checks are not atomic, the file could change after a check was performed and before it is renamed.
-            Interop.CheckIo(Interop.Sys.LStat(sourceFullPath, out Interop.Sys.FileStatus sourceStat), sourceFullPath);
+            Interop.CheckIo(Interop.Sys.LStatWrap(sourceFullPath, out Interop.Sys.FileStatus sourceStat), sourceFullPath);
 
             // Check source is not a directory.
             if ((sourceStat.Mode & Interop.Sys.FileTypes.S_IFMT) == Interop.Sys.FileTypes.S_IFDIR)
@@ -132,7 +132,7 @@ public static void ReplaceFile(string sourceFullPath, string destFullPath, strin
             }
 
             Interop.Sys.FileStatus destStat;
-            if (Interop.Sys.LStat(destFullPath, out destStat) == 0)
+            if (Interop.Sys.LStatWrap(destFullPath, out destStat) == 0)
             {
                 // Check destination is not a directory.
                 if ((destStat.Mode & Interop.Sys.FileTypes.S_IFMT) == Interop.Sys.FileTypes.S_IFDIR)
@@ -222,8 +222,8 @@ public static void MoveFile(string sourceFullPath, string destFullPath, bool ove
             // link/unlink approach and generating any exceptional messages from there as necessary.
 
             Interop.Sys.FileStatus sourceStat, destStat;
-            if (Interop.Sys.LStat(sourceFullPath, out sourceStat) == 0 && // source file exists
-                (Interop.Sys.LStat(destFullPath, out destStat) != 0 || // dest file does not exist
+            if (Interop.Sys.LStatWrap(sourceFullPath, out sourceStat) == 0 && // source file exists
+                (Interop.Sys.LStatWrap(destFullPath, out destStat) != 0 || // dest file does not exist
                  (sourceStat.Dev == destStat.Dev && // source and dest are on the same device
                   sourceStat.Ino == destStat.Ino)) && // source and dest are the same file on that device
                 Interop.Sys.Rename(sourceFullPath, destFullPath) == 0) // try the rename
@@ -411,12 +411,12 @@ private static void MoveDirectory(string sourceFullPath, string destFullPath, bo
 
             // The destination must not exist (unless it is a case-sensitive rename).
             // On Unix 'rename' will overwrite the destination file if it already exists, we need to manually check.
-            if (!isCaseSensitiveRename && Interop.Sys.LStat(destNoDirectorySeparator, out Interop.Sys.FileStatus destFileStatus) >= 0)
+            if (!isCaseSensitiveRename && Interop.Sys.LStatWrap(destNoDirectorySeparator.ToString (), out Interop.Sys.FileStatus destFileStatus) >= 0)
             {
                 // Maintain order of exceptions as on Windows.
 
                 // Throw if the source doesn't exist.
-                if (Interop.Sys.LStat(srcNoDirectorySeparator, out Interop.Sys.FileStatus sourceFileStatus) < 0)
+                if (Interop.Sys.LStatWrap(srcNoDirectorySeparator.ToString (), out Interop.Sys.FileStatus sourceFileStatus) < 0)
                 {
                     throw new DirectoryNotFoundException(SR.Format(SR.IO_PathNotFound_Path, sourceFullPath));
                 }

src/libraries/System.Private.CoreLib/src/System/IO/Path.Unix.cs

@@ -16,7 +16,7 @@ public static partial class Path
         // Checks if the given path is available for use.
         private static bool ExistsCore(string fullPath, out bool isDirectory)
         {
-            bool result = Interop.Sys.LStat(fullPath, out Interop.Sys.FileStatus fileInfo) == Interop.Errors.ERROR_SUCCESS;
+            bool result = Interop.Sys.LStatWrap(fullPath, out Interop.Sys.FileStatus fileInfo) == Interop.Errors.ERROR_SUCCESS;
             isDirectory = result && (fileInfo.Mode & Interop.Sys.FileTypes.S_IFMT) == Interop.Sys.FileTypes.S_IFDIR;
 
             return result;

src/native/libs/Common/pal_error_common.h

@@ -145,6 +145,9 @@ typedef enum
 
 inline static int32_t ConvertErrorPlatformToPal(int32_t platformErrno)
 {
+#if defined(TARGET_ANDROID)
+    __android_log_print (ANDROID_LOG_INFO, "CoreCLR", "%s at %s:%d. platformErrno == %d", __PRETTY_FUNCTION__, __FILE_NAME__, __LINE__, platformErrno);
+#endif
     switch (platformErrno)
     {
         case 0: