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Fixes #160773
OSError.__str__passed borrowed references to its attributes (errno,strerror,filename,filename2, andwinerroron Windows) toPyUnicode_FromFormat. Formatting one attribute with%S/%Rcan run arbitrary Python code. If that code modifies another attribute, the object being formatted can be freed while still in use.The fix now take strong references to the attributes before formatting and release them afterwards.
Added a regression test which cover the
filenameandfilename -> filename2formats.Tested on linux (Ubuntu 26.04).
OSError.__str__when a formatting callback clearsfilename#160773