Re: [Bug 278845] OpenMP Patches to prevent locking, hanging and CPU limiting to single core.

Typically the single core hangs may be in deliberately obfuscated code by Vixie crew we know how much those people like to waste cpu resources á la GCC.

Best regards,
Jussi Korkala

> On 8. May 2024, at 1.49, bugzilla-noreply@freebsd.org wrote:
> 
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278845
> 
>            Bug ID: 278845
>           Summary: OpenMP Patches to prevent locking, hanging and CPU
>                    limiting to single core.
>           Product: Base System
>           Version: 14.0-STABLE
>          Hardware: Any
>                OS: Any
>            Status: New
>          Severity: Affects Only Me
>          Priority: ---
>         Component: threads
>          Assignee: threads@FreeBSD.org
>          Reporter: cbl@cbl.us
>                CC: dim@FreeBSD.org
> 
> We worked with LLVM OpenMP development group to get a couple of PR fixes added
> to fix some big bugs we've been experiencing.
> 
> Fix#1 - Fixes forked processes from hanging:
> https://github.com/llvm/llvm-project/pull/88539
> Original issue reported: https://github.com/llvm/llvm-project/issues/86684
> 
> Fix#2 - Fixes child processes to use affinity_none. Before they were limited to
> using a single cpu core for all child processes.
> https://github.com/llvm/llvm-project/pull/91391
> Original issue reported: https://github.com/llvm/llvm-project/issues/91098
> 
> Fix#2 is only needed in version of llvm 16.x and later.  My original issue
> shows it's not an issue in 14.x or 15.x. Since FreeBSD 14.0 and 13.3 leverage
> 16.x and 17.x, this bug was triggered when we upgraded servers to either
> release.
> 
> Hoping we can get both into 14.1 in time for it's upcoming release.
> 
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