kernel/git/stable/linux.git/tools/perf, branch linux-6.12.y

perf test: Don't signal all processes on system when interrupting tests

2026-09-14T11:32:59+00:00

[ Upstream commit f54cd8f43f55c0274c5b51509aff39675639c2e1 ] This signal handler loops over all tests on ctrl-C, but it's active while the test list is being constructed. process.pid is 0, then -1, then finally set to the child pid on fork. If the Ctrl-C is received during this point a kill(-1, SIGINT) can be sent which affects all processes. Make sure the child has forked first before forwarding the signal. This can be reproduced with ctrl-C immediately after launching perf test which terminates the ssh connection. Fixes: 553d5efeb341 ("perf test: Add a signal handler to kill forked child processes") Signed-off-by: James Clark Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20241129151948.3199732-1-james.clark@linaro.org Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf dso: Guard against cache underflow on short reads in dso_cache__memcpy()

2026-09-14T11:32:46+00:00

[ Upstream commit 390a9461cd73bdd13acc0f6d763618ae1ff8fa17 ] dso_cache__memcpy() computes cache_offset = offset - cache->offset, then cache_size = min(cache->size - cache_offset, size). The RB tree lookup in __dso_cache__find() matches using the full DSO__DATA_CACHE_SIZE window, but cache->size reflects the actual pread return value from dso_cache__populate(). A short pread (e.g. near end-of-file) makes cache->size smaller than DSO__DATA_CACHE_SIZE. If a subsequent access targets an offset past cache->offset + cache->size but within the DSO__DATA_CACHE_SIZE window, the cache entry is found but cache_offset exceeds cache->size. Since both are u64, the subtraction cache->size - cache_offset wraps to a large value, min() selects the caller's size, and memcpy reads out of bounds. Return 0 for an offset past the valid cached data. For a regular file a short pread only happens at end-of-file, so 0 is what a direct pread() at that offset would return: cached_io() stops its read loop as on EOF. Re-reading from the backing file would not help — a second pread at the same offset returns the same short count. Fixes: 366df72657e0 ("perf dso: Refactor dso_cache__read()") Reported-by: sashiko-bot Reviewed-by: Ian Rogers Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf dso: Use stored fd error instead of stale errno in file_read() and file_size()

2026-09-14T11:32:46+00:00

[ Upstream commit 075d2c32353ded0fe5f3b62f4aa4e98dccb3fb29 ] file_read() and file_size() use ret = -errno when dso__data(dso)->fd is negative after try_to_open_dso() fails. By this point errno has been through mutex_lock(), nsinfo__mountns_enter(), and multiple open() attempts inside try_to_open_dso() — it no longer reflects the actual open failure. If errno happens to be 0, ret = 0 looks like EOF rather than an error, and file_size() callers like dso__data_size() would then report a zero-sized file instead of failing. dso__data(dso)->fd is always negative on failure — -errno from __open_dso() when no filename could be built (e.g. -EINVAL, -ENOENT), or -1 when do_open() itself failed — and never 0, so use it directly instead of reading the stale global errno. No assert() or comment is needed after the assignment: the enclosing if (dso__data(dso)->fd < 0) already guarantees ret < 0 [Namhyung Kim review]. Fixes: 33bdedcea2d7 ("perf tools: Protect dso cache fd with a mutex") Reported-by: sashiko-bot Reviewed-by: Ian Rogers Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf dso: Guard close() against invalid fd in dso__decompress_kmodule_path()

2026-09-14T11:32:46+00:00

[ Upstream commit 10f452dc2de401be76ae8e7395c9663313df8b53 ] dso__decompress_kmodule_path() unconditionally calls close(fd) on the return value of decompress_kmodule(). When decompression fails or the DSO is not compressed, decompress_kmodule() returns -1. close(-1) fails with EBADF and clobbers errno, which callers up the chain (dso__get_filename → __open_dso) depend on for error propagation. Guard the close() call with fd >= 0 so only valid file descriptors are closed. Fixes: 42b3fa670825 ("perf tools: Introduce dso__decompress_kmodule_{fd,path}") Reported-by: sashiko-bot Reviewed-by: Ian Rogers Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf synthetic-events: Fix divide by zero in perf_event__synthesize_threads

2026-09-14T11:32:39+00:00

[ Upstream commit 16a12a54e9a1151a37aab74914a51b86f7f58d0e ] If scandir() finds no matching tasks in /proc, n is 0. If thread_nr is > 1, we bypass the single-thread fast path and then clamp thread_nr to n, making it 0. This results in a divide by zero when calculating num_per_thread. Handle n <= 1 early to use the single-thread fast path and prevent the crash. Fixes: 340b47f510bb ("perf top: Implement multithreading for perf_event__synthesize_threads") Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf python: Check counts_values size in set_values

2026-09-14T11:32:39+00:00

[ Upstream commit 612aca22a978d43f6e6765272676a17afdba8572 ] The set_values function incorrectly assumed the list contained exactly 5 elements. Add a check to prevent out-of-bounds access. Fixes: 877108e42b1b ("perf tools: Initial python binding") Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf python: Add support for 'struct perf_counts_values' to return counter data

2026-09-14T11:32:39+00:00

[ Upstream commit 3b4991dcb49e1d99129ead644858cf7f77b8fb6b ] Add support for the perf_counts_values struct to enable the python bindings to read and return the counter data. Committer notes: Use T_ULONG instead of Py_T_ULONG, as all the other PyMemberDef arrays, fixing the build with older python3 versions. Use { .name = NULL, } to finish the new PyMemberDef pyrf_counts_values_members array, again as the other arrays to please some clang versions, ditto for PyGetSetDef. Signed-off-by: Gautam Menghani Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Howard Chu Cc: Ingo Molnar Cc: Jiri Olsa Cc: Kan Liang Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250519195148.1708988-5-irogers@google.com Signed-off-by: Ian Rogers Signed-off-by: Arnaldo Carvalho de Melo Stable-dep-of: 612aca22a978 ("perf python: Check counts_values size in set_values") Signed-off-by: Sasha Levin

perf python: Remove python 2 scripting support

2026-09-14T11:32:39+00:00

[ Upstream commit e7e9943c87d857da650f228fdf6cb47b785b3ff9 ] Python2 was deprecated 4 years ago, remove support and workarounds. Signed-off-by: Ian Rogers Acked-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Athira Rajeev Cc: Colin Ian King Cc: Dapeng Mi Cc: Howard Chu Cc: Ilya Leoshkevich Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Josh Poimboeuf Cc: Kan Liang Cc: Mark Rutland Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Thomas Richter Cc: Veronika Molnarova Cc: Weilin Wang Link: https://lore.kernel.org/r/20241119011644.971342-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo Stable-dep-of: 612aca22a978 ("perf python: Check counts_values size in set_values") Signed-off-by: Sasha Levin

perf test: Fix skiplist leak in cmd_test

2026-09-14T11:32:38+00:00

[ Upstream commit 44e82c4d2ff37f073946b594840fd549ab6b9fb8 ] Fix a memory leak in cmd_test() where skiplist was not freed on exit paths. Assisted-by: Antigravity:gemini-3.1-pro Fixes: 2ae828786c65 ("perf test: Allow skipping tests") Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf test: Support dynamic test suites with setup callback and private data

2026-09-14T11:32:38+00:00

[ Upstream commit 8c8d61c38d8e1755a4325f8acb396137bbd5371a ] Add void *priv to struct test_case to allow passing per-test context. Add int (*setup)(struct test_suite *) to struct test_suite to allow dynamic generation of test cases. Update build_suites() to invoke the setup callback for each suite if present, ensuring dynamic cases are available before listing or running. Assisted-by: Gemini-CLI:Google Gemini 3 Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo Stable-dep-of: 44e82c4d2ff3 ("perf test: Fix skiplist leak in cmd_test") Signed-off-by: Sasha Levin