[LTP] pipe13: Scale child reap window with LTP_TIMEOUT_MUL

[linuxtestproject.agent@gmail.com]

Hi Stephen,

On Fri, 10 Jul 2026 10:31:19 -0400, Stephen Bertram wrote:
> pipe13: Scale child reap window with LTP_TIMEOUT_MUL

> The post-close wait used a fixed 1000000 us cap on exponential backoff
> (~524 ms total).

The total accumulated sleep time is 1+2+4+...+524288 = 1048575 us,
which is approximately 1048 ms (~1 second), not 524 ms.

524288 us (~524 ms) is the maximum value of a single usleep() call
within the loop -- not the total.

> on a debug kernel, about 1 to 2 times when iterated 5 times.
> With the addition of the function, under the same conditions,
> it has not failed in 100 iterations.

"paralell" -> "parallel".

Verdict - Needs revision

Pre-existing: pipe13.c carries an old-style "Test Description:" comment
block instead of the /*\ ... */ RST doc-comment format now required by
LTP conventions. Not introduced by this patch, but worth fixing in a
follow-up.

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