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bug#31238: Dynamic Module Crash

From: Philipp Stephani
Subject: bug#31238: Dynamic Module Crash
Date: Fri, 21 Sep 2018 19:16:44 +0200

Philipp Stephani <address@hidden> schrieb am Di., 24. Apr. 2018 um 16:08 Uhr:
Tuấn Anh Nguyễn <address@hidden> schrieb am So., 22. Apr. 2018 um 18:32 Uhr:
Emacs 25.3.1 crashes with a segfault when trying to print a value constructed (in certain ways) by a dynamic module.

Reproduction: https://github.com/ubolonton/emacs-module-crash

Context: https://github.com/ubolonton/emacs-module-rs/issues/2

This might be caused by commit 3eb93c07f7a60ac9ce8a16f10c3afd5a3a31243a, which removed GC protection for module-allocated values. 

Unless anybody complains, I'll revert that commit. Modules can store/use emacs_value objects in arbitrary ways; there's no way we can rely on stack scanning to reliably find them. 

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