On 12/23/2020 10:35 PM, Alexey Sokolov wrote:
Synopsis: getaddrinfo() is not thread-safe in 6.8
Category: system
Environment:
System : OpenBSD 6.8
Details : OpenBSD 6.8 (GENERIC.MP) #1: Tue Nov 3 09:06:04 MST 2020
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
Architecture: OpenBSD.amd64
Machine : amd64
Description:
Hi, getaddrinfo() crashes when multiple threads run getaddrinfo()
concurrently. This didn't happen in 6.7.
It looks like asr_ctx which is supposed to be thread-local according to
_asr_use_resolver(), is actually static / shared between threads.
How-To-Repeat:
Compile this code (gcc a.c -pthread), and run. It will segfault in
several seconds. Happens with both gcc (4.2.1) and egcc (8.4.0).
Before going any further. Use the system compiler. That is Clang (cc).
