bug#22608: Module system thread unsafety and .go compilation

[ludo@gnu.org (Ludovic Courtès)]

Hello,

taylanbayirli@gmail.com (Taylan Ulrich "Bayırlı/Kammer") skribis:

> To speed up the compilation of the many Scheme files in Guix, we use a
> script that first loads all modules to be compiled into the Guile
> process (by calling 'resolve-interface' on the module names), and then
> the corresponding Scheme files are compiled in a par-for-each.
>
> While Guile's module system is known to be thread unsafe, the idea was
> that all mutation should happen in the serial loading phase, and the
> parallel compile-file calls should then be thread safe.
>
> Sadly that assumption isn't met when autoloads are involved.

For the record, these issues should be fixed in Guile 2.2.4:

533e3ff17 * Serialize accesses to submodule hash tables.
46bcbfa56 * Module import obarrays are accessed in a critical section.
761cf0fb8 * Make module autoloading thread-safe.

‘guix pull’ now defaults to 2.2.4, so we’ll see if indeed those crashes
disappear.

Ludo’.