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From: "mcermak at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/31117] New: transport failures
Date: Wed, 06 Dec 2023 15:39:43 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31117

            Bug ID: 31117
           Summary: transport failures
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: mcermak at redhat dot com
  Target Milestone: ---

Created attachment 15241
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D15241&action=3Ded=
it
testcase patch allowing to demonstrate the problem

In the recent past, there were some problems with transport failures (PR291=
08).
 This was fixed.  But apparently the situation still isn't 100% perfect.=20
Pretty much
all the syscall tests are now failing on RHEL-9.4 with transport failures. =
 It
is reliably reproducible.  By default, the problem is hidden in the testsui=
te's
expect gates.  To visualize it, I've used the attached patch.  With that pa=
tch
applied (on top of systemtap commit b2a1261c434788cb and
kernel-5.14.0-394.el9.x86_64), I have:


el9 x86_64 # make installcheck RUNTESTFLAGS=3Dsyscall.exp CHECK_ONLY=3Dfutex

[ ... stuff deleted ... ]

Running /root/systemtap/testsuite/systemtap.syscall/syscall.exp ...

[ ... stuff deleted ... ]

Comparing ^futex: futex \(0x0, FUTEX_CMP_REQUEUE, 1, 0, 0x[f]+, 0\) =3D [\-=
0-9]+
against futex: futex (0x0, FUTEX_CMP_REQUEUE, 1, 0, 0xffffffffffffffff, 0) =
=3D
-14 (EFAULT)
Comparing ^futex: futex \(0x0, FUTEX_CMP_REQUEUE, 1, 0, 0x0, -1\) =3D [\-0-=
9]+
against futex: futex (0x0, FUTEX_CMP_REQUEUE, 1, 0, 0x0, -1) =3D WARNING: T=
here
were 1 transport failures. Try stap -s to increase the buffer size from 16.


I've tested that simpler syscall tests (e.g. those having most of their
<testcase>.c content commented out) the test result is sometimes PASS and
sometimes FAIL.  But using a "normal" syscall test involving 10+ system cal=
ls
and their checks, the failure is guaranteed..

--=20
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