[Bug libc/29585] sched_getcpu returns invalid results

["mjbaars1977 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29585

--- Comment #13 from Mischa Baars <mjbaars1977 at gmail dot com> ---
You're more of less right, I now have function input and output through the
child function argument pointer, if configured correctly with mmap(),
instead of only an exit code. On the other hand, mmap() provides the
ability to write to parent memory with fork() as well if I'm correct. Still
fiddling around a little with all the options.

The biggest problem with CLONE_VM is that malloc() seems to be unaware of
its own doings in other kernel worker threads and on occasion returns the
same memory address more than once.

I was looking for a way to connect to the database in parallel, but
PQconnect() uses malloc() internally.


On Wed, 28 Sep 2022, 12:09 schwab@linux-m68k.org, <
sourceware-bugzilla@sourceware.org> wrote:

> https://sourceware.org/bugzilla/show_bug.cgi?id=29585
>
> --- Comment #12 from Andreas Schwab <schwab@linux-m68k.org> ---
> clone without CLONE_VM is the same as fork (but without running the fork
> handlers you still get undefined behaviour).
>
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