Attempt to log before terminating if prevector allocation fails

src/util.cpp

@@ -17,6 +17,7 @@
 #include "utiltime.h"
 
 #include <stdarg.h>
+#include <stdio.h>
 
 #if (defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__))
 #include <pthread.h>
@@ -179,6 +180,20 @@ static FILE* fileout = NULL;
 static boost::mutex* mutexDebugLog = NULL;
 static list<string> *vMsgsBeforeOpenLog;
 
+[[noreturn]] void new_handler_terminate()
+{
+    // Rather than throwing std::bad-alloc if allocation fails, terminate
+    // immediately to (try to) avoid chain corruption.
+    // Since LogPrintf may itself allocate memory, set the handler directly
+    // to terminate first.
+    std::set_new_handler(std::terminate);
+    fputs("Error: Out of memory. Terminating.\n", stderr);
+    LogPrintf("Error: Out of memory. Terminating.\n");
+
+    // The log was successful, terminate now.
+    std::terminate();
+};
+
 static int FileWriteStr(const std::string &str, FILE *fp)
 {
     return fwrite(str.data(), 1, str.size(), fp);