tests: Flaky strace-tst-thp-*-disabled tests

[Yury Khrustalev]

On Wed, Aug 19, 2026 at 08:34:30AM -0300, Adhemerval Zanella Netto wrote:
> 
> On 19/08/26 05:55, Yury Khrustalev wrote:
> > Hi everyone,
> > 
> > Has anyone else noticed that the elf/strace-tst-thp-*-disabled tests are
> > flaky producing FAIL results because madvise syscall occasionally occurs
> > despite using tunable glibc.elf.thp=0?
> > 
> > The current logic of how this tunable is handled is a bit complex, I'm
> > trying to pin point the reason for this, but I've seen these tests
> > failing from time to time with no particular pattern.
> I recalled that I saw some spurious issue after the release, but I haven't
> see any after 2be733e9e0b2e8871cd282f2ee868d75108db7f1. I will double check.

I see it on recent master including today's commit a0faa928b0.

  fails=0; for ((i=0;i<100;i++)); \
    do make test t=elf/strace-tst-thp-1-disabled |& grep -qw FAIL && ((fails++)); \
    done; echo "$fails failed"

I see ~7 failures for 100 test runs.