perf test: Add truncated perf.data robustness test

2026-05-29T14:44:35+00:00

Add a shell test that verifies perf report handles truncated perf.data files gracefully — exiting with an error code rather than crashing with SIGSEGV or SIGABRT. The test records a simple workload, then truncates the resulting perf.data at four offsets that exercise different parsing stages: 8 bytes — file header magic only 64 bytes — partial file header (attr section incomplete) 256 bytes — into the first events (partial event headers) 75% size — mid-stream truncation (partial event data) For each truncation, perf report is run and the exit code is checked: - Exit code 0 (success) fails the test — a truncated file should never parse without error. - Crash signals are detected portably via kill -l, which maps the signal number to a name on the running system. This handles architectures where signal numbers differ (e.g. SIGBUS is 7 on x86/ARM but 10 on MIPS/SPARC). Core-dump and fatal signals (KILL, ILL, ABRT, BUS, FPE, SEGV, TRAP, SYS) fail the test. - Higher exit codes (200+) are perf's own negative-errno returns (e.g. -EINVAL = 234) and are expected. This exercises the bounds checking, minimum-size validation, and error propagation added by the preceding patches in this series. Testing it: root@number:~# perf test truncat 84: Test that perf report handles truncated perf.data gracefully (no crash, no segfault — clean error exit).: Ok root@number:~# perf test -vv truncat 84: Test that perf report handles truncated perf.data gracefully (no crash, no segfault — clean error exit).: --- start --- test child forked, pid 62890 ---- end(0) ---- 84: Test that perf report handles truncated perf.data gracefully (no crash, no segfault — clean error exit).: Ok root@number:~# Changes in v2: - Add SIGKILL to the list of fatal signals so OOM kills from resource exhaustion bugs are detected (Reported-by: sashiko-bot@kernel.org) Reviewed-by: Ian Rogers Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Assisted-by: Claude:claude-opus-4.6-1m [ Fixed the SPDX on the line where 'perf test' expects the test description, reviewed by Ian Rogers ] Signed-off-by: Arnaldo Carvalho de Melo

kernel/linux.git/tools/perf/tests/shell/data_validation.sh, branch v7.2-rc1

perf test: Add truncated perf.data robustness test