Random preparser_thumbnail failure

Assertion failed: (status == -EINTR), function thumbnailer_callback_cancel, file thumbnail.c, line 194.
FAIL test_src_preparser_thumbnail (exit status: 134)

Reproduction scenario:

run the test

Frequency:

rare, stress -c 10 helps on my machine
while make -C build-native/test check -j10 TESTS=test_src_preparser_thumbnail; do reset; done

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