selftests/bpf: Fix intermittent failures in file_reader test

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file_reader/on_open_expect_fault intermittently fails when test_progs
runs tests in parallel, because it expects a page fault on first read.
Another file_reader test running concurrently may have already pulled
the same pages into the page cache, eliminating the fault and causing a
spurious failure.

Make file_reader/on_open_expect_fault read from a file region that does
not overlap with other file_reader tests, so the initial access still
faults even under parallel execution.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Acked-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20251029195907.858217-1-mykyta.yatsenko5@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Mykyta Yatsenko 2025-10-29 19:59:07 +00:00 • committed by Alexei Starovoitov

parent e2e668bd81

commit 5913e936f6

2 changed files with 6 additions and 2 deletions

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6

tools/testing/selftests/bpf/prog_tests/file_reader.c

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2

tools/testing/selftests/bpf/progs/file_reader.c

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