Kumar Kartikeya Dwivedi 15cf39221e selftests/bpf: Add stress test for rqspinlock in NMI ... Introduce a kernel module that will exercise lock acquisition in the NMI path, and bias toward creating contention such that NMI waiters end up being non-head waiters. Prior to the rqspinlock fix made in the commit 0d80e7f951 ("rqspinlock: Choose trylock fallback for NMI waiters"), it was possible for the queueing path of non-head waiters to get stuck in NMI, which this stress test reproduces fairly easily with just 3 CPUs. Both AA and ABBA flavors are supported, and it will serve as a test case for future fixes that address this corner case. More information about the problem in question is available in the commit cited above. When the fix is reverted, this stress test will lock up the system. To enable this test automatically through the test_progs infrastructure, add a load_module_params API to exercise both AA and ABBA cases when running the test. Note that the test runs for at most 5 seconds, and becomes a noop after that, in order to allow the system to make forward progress. In addition, CPU 0 is always kept untouched by the created threads and NMIs. The test will automatically scale to the number of available online CPUs. Note that at least 3 CPUs are necessary to run this test, hence skip the selftest in case the environment has less than 3 CPUs available. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20250927205304.199760-1-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2025-09-28 03:18:40 -07:00
..
crypto/chacha20-s390	crypto: lib/chacha - strongly type the ChaCha state	2025-05-12 13:32:53 +08:00
cxl	cxl for v6.17	2025-08-01 15:47:06 -07:00
fault-injection
ktest	ktest.pl: Add new PATCHCHECK_SKIP option to skip testing individual commits	2025-07-29 09:30:08 -04:00
kunit	Revert "kunit: configs: Enable CONFIG_INIT_STACK_ALL_PATTERN in all_tests"	2025-06-03 11:20:21 +02:00
memblock	memblock: add MEMBLOCK_RSRV_KERN flag	2025-05-12 23:50:38 -07:00
nvdimm	mm: remove callers of pfn_t functionality	2025-07-09 22:42:19 -07:00
radix-tree	tools/testing/radix-tree: test maple tree chaining mas_preallocate() calls	2025-07-09 22:42:12 -07:00
rbtree	lib/interval_tree: add test case for span iteration	2025-03-17 12:17:01 -07:00
scatterlist
selftests	selftests/bpf: Add stress test for rqspinlock in NMI	2025-09-28 03:18:40 -07:00
shared	tools/testing: add linux/args.h header and fix radix, VMA tests	2025-08-19 16:35:54 -07:00
vma	Significant patch series in this pull request:	2025-08-05 16:02:07 +03:00
vsock	vsock/test: fix vsock_ioctl_int() check for unsupported ioctl	2025-07-16 16:14:00 -07:00