[Rpm-maint] [rpm-software-management/rpm] Parallel rpmfc thread-safety - libmagic may fork helpers (#756)

[Alexander Kanavin]

I dug a bit deeper: the issue happens when libmagic calls out to external executables, which isn't implemented in a thread-safe way, and locks up. Enabling internal compression support (done via linking to libraries) makes the issue go away.


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