diff --git a/compiler-rt/lib/sanitizer_common/scripts/sancov.py b/compiler-rt/lib/sanitizer_common/scripts/sancov.py
--- a/compiler-rt/lib/sanitizer_common/scripts/sancov.py
+++ b/compiler-rt/lib/sanitizer_common/scripts/sancov.py
@@ -193,16 +193,14 @@
   # - __sanitizer_cov() or __sanitizer_cov_with_check(),
   # - with call or callq,
   # - directly or via PLT.
-  cmd = "objdump -d %s | " \
-        "grep '^\s\+[0-9a-f]\+:.*\scall\(q\|\)\s\+[0-9a-f]\+ <__sanitizer_cov\(_with_check\|\|_trace_pc_guard\)\(@plt\|\)>' | " \
-        "grep '^\s\+[0-9a-f]\+' -o" % binary
-  proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
-                          shell=True)
-  proc.stdin.close()
+  cmd = r"objdump --no-show-raw-insn -d %s | " \
+        r"grep '^\s\+[0-9a-f]\+:\s\+call\(q\|\)\s\+\(0x\|\)[0-9a-f]\+ <__sanitizer_cov\(_with_check\|\|_trace_pc_guard\)\(@plt\|\)>' | " \
+        r"grep -o '^\s\+[0-9a-f]\+'" % binary
+  lines = subprocess.check_output(cmd, stdin=subprocess.PIPE, shell=True).splitlines()
   # The PCs we get from objdump are off by 4 bytes, as they point to the
   # beginning of the callq instruction. Empirically this is true on x86 and
   # x86_64.
-  return set(int(line.strip(), 16) + 4 for line in proc.stdout)
+  return set(int(line.strip(), 16) + 4 for line in lines)
 
 def PrintMissing(binary):
   if not os.path.isfile(binary):