fix soname comparison error with version numbers after .so

src/memmap.c

@@ -87,7 +87,18 @@ MemorySpan memmaps_find_by_name(const char region_name[static 1],
 
     const MemoryMap *reg = &vector_at(maps, i);
 
-    if (reg->pathname && strcmp(reg->pathname, region_name) == 0) {
+    // The name shown in /proc/pid/maps and the one given by dlinfo don't
+    // always match. More specific version numbers might be different, or
+    // the file could be e.g. "libelf-0.188.so", but the fname ends in
+    // libelf with a different path. /usr/lib vs. /lib is a common mismatch.
+    //
+    // It doesn't concern as most times, as that tends to happen in system
+    // libraries, but just in case we now cut the compare length to what
+    // was given.
+    //
+    // TODO: use only the libname-until.so for equality comparisons
+    if (reg->pathname &&
+        strncmp(reg->pathname, region_name, strlen(region_name)) == 0) {
       if (reg->span.start < start) {
         start = reg->span.start;
       }