Bug 1355834 - Report LLVM symbolizer OOMs as errors. r=jgraham

This will make it easier to correctly star these failures, which
otherwise simply show up as a false positive leak.

MozReview-Commit-ID: 5P6AMRyYmtI

testing/mochitest/leaks.py

@@ -167,6 +167,7 @@ class LSANLeaks(object):
         self.logger = logger
         self.inReport = False
         self.fatalError = False
+        self.symbolizerError = False
         self.foundFrames = set([])
         self.recordMoreFrames = None
         self.currStack = None
@@ -188,6 +189,8 @@ class LSANLeaks(object):
             "==\d+==ERROR: LeakSanitizer: detected memory leaks")
         self.fatalErrorRegExp = re.compile(
             "==\d+==LeakSanitizer has encountered a fatal error.")
+        self.symbolizerOomRegExp = re.compile(
+            "LLVMSymbolizer: error reading file: Cannot allocate memory")
         self.stackFrameRegExp = re.compile("    #\d+ 0x[0-9a-f]+ in ([^(</]+)")
         self.sysLibStackFrameRegExp = re.compile(
             "    #\d+ 0x[0-9a-f]+ \(([^+]+)\+0x[0-9a-f]+\)")
@@ -201,6 +204,10 @@ class LSANLeaks(object):
             self.fatalError = True
             return
 
+        if re.match(self.symbolizerOomRegExp, line):
+            self.symbolizerError = True
+            return
+
         if not self.inReport:
             return
 
@@ -240,6 +247,12 @@ class LSANLeaks(object):
             self.logger.error("TEST-UNEXPECTED-FAIL | LeakSanitizer | LeakSanitizer "
                               "has encountered a fatal error.")
 
+        if self.symbolizerError:
+            self.logger.error("TEST-UNEXPECTED-FAIL | LeakSanitizer | LLVMSymbolizer "
+                              "was unable to allocate memory.")
+            self.logger.info("TEST-INFO | LeakSanitizer | This will cause leaks that "
+                             "should be ignored to instead be reported as an error")
+
         if self.foundFrames:
             self.logger.info("TEST-INFO | LeakSanitizer | To show the "
                              "addresses of leaked objects add report_objects=1 to LSAN_OPTIONS")