Browsing a folder in the Readest Library spawns a forked child per
cloud cover via syncbooks.downloadCover. On Boox / Adreno devices the
child crashed with a SIGSEGV (issue #4165): it terminated through the
libc exit() path, and __cxa_finalize ran the destructor of the GL
driver inherited from the parent, which segfaults on Adreno.
Terminate the child with ffi.C._exit(0) instead. _exit() skips libc
atexit handlers, so __cxa_finalize — and the Adreno destructor it runs
— never execute. The body is also wrapped in pcall so a network error
in http.request cannot unwind past that _exit call.
This eliminates the child-side crash in the reported tombstone. The
parent KOReader exiting is most likely a knock-on effect of the child
tearing down GPU state shared across the fork, but that link is not
provable from the log alone — so this intentionally does not
auto-close #4165 until confirmed on an affected device.
No unit test: the fork + network path isn't reproducible in the busted
harness, consistent with the other network methods in this file.
Huang Xin
e0cb433550