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Re: pkg/54192: lang/rust build error

The following reply was made to PR toolchain/54192; it has been noted by GNATS.

From: Martin Husemann <>
To: Kamil Rytarowski <>
Subject: Re: pkg/54192: lang/rust build error
Date: Wed, 16 Oct 2019 15:50:51 +0200

 Since it was not obvious to me, let me try to explain what happens:
  - a multithreaded program calls fork()
  - the forked child process only has a single lwp initially, wich has lid 1
 So in the parent thread _lwp_self() (aka lid) was != 1, and now in the child
 it has changed. Apparently something in ld.elf_so goes wrong later when
 using _lwp_self() == 1 with a memory state inherited that was setup for 
 _lwp_self() != 1.
 Joergs patch makes the single lwp inherit the lid from the forking parent
 thread (instead of always being 1).

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