Remove regions that have ever had PR_SET_VMA_ANON_NAME called on them…

… from always_free_address_space.

src/ReplaySession.cc

@@ -105,7 +105,7 @@ const ReplaySession::MemoryRanges& ReplaySession::always_free_address_space(
     auto frame = tmp_reader.read_frame();
     auto event = frame.event();
     // If a region was ever mprotected to something that's not PROT_NONE,
-    // we need to delete it as well.
+    // or had PR_SET_VMA_ANON_NAME called on it, we need to delete it as well.
     if (event.is_syscall_event()) {
       auto syscall_event = event.Syscall();
       if (is_mprotect_syscall(syscall_event.number, syscall_event.arch()) ||
@@ -117,6 +117,14 @@ const ReplaySession::MemoryRanges& ReplaySession::always_free_address_space(
           delete_range(*result, MemoryRange(start, size));
         }
       }
+      if (is_prctl_syscall(syscall_event.number, syscall_event.arch())) {
+        auto regs = frame.regs();
+        if (regs.arg2() == PR_SET_VMA_ANON_NAME) {
+          remote_ptr<void> start = regs.arg3();
+          size_t size = regs.arg4();
+          delete_range(*result, MemoryRange(start, size));
+        }
+      }
     } else if (event.is_syscallbuf_flush_event()) {
       auto syscallbuf_flush_event = event.SyscallbufFlush();
       for (auto& record : syscallbuf_flush_event.mprotect_records) {