Follow-up Comment #1, bug #43601 (project grub):
The problem seems to originate during file closure. I added debug logging to
grub_file_close, logging messages before the fs close, device close, and file
free. I've attached a screenshot of the failure; at first I cat extbootopt
without check_signatures set and then cat again with check_signatures set.
The device close seems to be the origin of the failure.
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