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Sorry, I'm unable to reproduce the crash using the read-only filesystem. But an assertion confirmed me that the restype is not initialized which is an obvious bug.
ctypes-erofs-crash.diff: LGTM. By the way, the flags field is not initialized neither, but it's probably less important (at least for the destructor).
Alexander Belopolsky: "It would be nice to add a unit test to this patch."
I tried to write a short unit test triggering the bug, but it really depends on low-level implementation details for a very specific corner case. I would prefer to avoid such complex unit test and just fix the bug. We waited for an unit test the last 5 years, it's too late now :-)
"A nit-pick: it would be easier to verify that all CThunkObject fields are initialized if initialization was done in the same order as declaration:"
Right, I rewrote the patch as you suggested. I noticed that flags is not initialized neither (also fixed in my patch).
I pushed a fix.
Thanks marcin.bachry for the initial patch! Thanks Pavel Labushev for your bug report! ... but sorry for the very long delay :-( It looks like nobody reproduced the bug recently, maybe it was fixed in libffi in the meanwhile?