If uname -r returns something odd, perl could return an error code and
the test would be erroneously skipped. The qx// syntax avoid this.
Followup to 08f9b2148
These kernels only send a fraction of the requested amount of the first
large block, invalidating the assumptions of the test and causing it to
fail.
Assisted-by: Christian Weisgerber
Ref: https://curl.se/mail/lib-2023-09/0021.htmlCloses#11888
These are ones likely to fail on heavily-loaded machines that alter the
normal test timing. Most of these tests already had the flaky keyword
since this condition makes them more likely to fail on CI.
In this situation, only part of the data has been sent before aborting
so the connection is no longer usable.
Assisted-by: Jay Satiro
Fixes#11678Closes#11679
