AllowSearch.java creates an imageio*.tmp file in the default temp directory, but does not clean it up later.
cat -n jdk/test/javax/imageio/AllowSearch.java
[...]
49 File f = File.createTempFile("imageio", ".tmp");
A better approach would be to create temporary test files under the jtreg property user.dir instead, if it is defined.
During a jtreg run, user.dir has the value $PWD/JTwork/scratch
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