diff --git a/Lib/test/test_trace.py b/Lib/test/test_trace.py
index 5f712111ca14e0..fad2b3b8379ffc 100644
--- a/Lib/test/test_trace.py
+++ b/Lib/test/test_trace.py
@@ -1,4 +1,5 @@
import os
+from pickle import dump
import sys
from test.support import captured_stdout
from test.support.os_helper import (TESTFN, rmtree, unlink)
@@ -412,6 +413,15 @@ def test_issue9936(self):
self.assertIn(modname, coverage)
self.assertEqual(coverage[modname], (5, 100))
+ def test_coverageresults_update(self):
+ # Update empty CoverageResults with a non-empty infile.
+ infile = TESTFN + '-infile'
+ with open(infile, 'wb') as f:
+ dump(({}, {}, {'caller': 1}), f, protocol=1)
+ self.addCleanup(unlink, infile)
+ results = trace.CoverageResults({}, {}, infile, {})
+ self.assertEqual(results.callers, {'caller': 1})
+
### Tests that don't mess with sys.settrace and can be traced
### themselves TODO: Skip tests that do mess with sys.settrace when
### regrtest is invoked with -T option.
diff --git a/Lib/trace.py b/Lib/trace.py
index 2cf3643878d4b8..213e46517d683d 100755
--- a/Lib/trace.py
+++ b/Lib/trace.py
@@ -172,7 +172,7 @@ def __init__(self, counts=None, calledfuncs=None, infile=None,
try:
with open(self.infile, 'rb') as f:
counts, calledfuncs, callers = pickle.load(f)
- self.update(self.__class__(counts, calledfuncs, callers))
+ self.update(self.__class__(counts, calledfuncs, callers=callers))
except (OSError, EOFError, ValueError) as err:
print(("Skipping counts file %r: %s"
% (self.infile, err)), file=sys.stderr)
diff --git a/Misc/NEWS.d/next/Library/2022-11-21-17-56-18.gh-issue-51524.nTykx8.rst b/Misc/NEWS.d/next/Library/2022-11-21-17-56-18.gh-issue-51524.nTykx8.rst
new file mode 100644
index 00000000000000..63fe7b8a3a3254
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-11-21-17-56-18.gh-issue-51524.nTykx8.rst
@@ -0,0 +1 @@
+Fix bug when calling trace.CoverageResults with valid infile.
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