[PATCH 0/6] test: fix sporadic failures on high core count systems

[Stephen Hemminger <stephen@networkplumber.org>]

This series addresses several test failures that occur sporadically on
systems with many cores (32+), particularly on AMD Zen architectures.
I think Ferruh may have addressed similar problems in earlier	
releases.

The root causes fall into three categories:

1. Missing rte_pause() in synchronization spinloops (patch 1)
   Tight spinloops without pause cause SMT thread starvation and
   unpredictable timing behavior.

2. Fixed iteration counts that don't scale (patch 2)
   The atomic test performs 1M iterations per worker regardless of
   core count. With 32+ cores, contention causes timeout failures.
   Bugzilla ID: 952

3. File-prefix collisions during parallel test execution (patches 5-6)
   Multiple tests using the default "rte" prefix compete for the same
   fbarray files, causing EAL initialization failures.

Additionally, two BPF-related fixes are included:

4. Race condition in BPF ELF loading (patch 3)
   Missing fsync() before close() causes sporadic EINVAL failures.

5. Unsupported BPF instructions with newer clang (patch 4)
   Clang 20+ generates JMP32 instructions that DPDK BPF doesn't support.
   Bugzilla ID: 1844

Stephen Hemminger (6):
  test: add pause to synchronization spinloops
  test: fix timeout for atomic test on high core count systems
  test: fix race condition in ELF load tests
  test: fix unsupported BPF instructions in elf load test
  test: add file-prefix for all fast-tests on Linux
  test: fix trace_autotest_with_traces parallel execution

 app/test/bpf/meson.build    |  3 +-
 app/test/suites/meson.build | 20 ++++++++---
 app/test/test_atomic.c      | 67 ++++++++++++++++++++++---------------
 app/test/test_bpf.c         |  5 ++-
 4 files changed, 62 insertions(+), 33 deletions(-)

-- 
2.51.0