kernel/git/stable/linux-stable.git/tools/testing/selftests, branch linux-6.18.y

selftests: vDSO: getrandom: Fix path to s390 chacha implementation

2026-09-14T11:36:16+00:00

[ Upstream commit d045e166d3c51b7aec069669bb243e057d80d04f ] The s390 vDSO source directory was recently moved, but this reference was not updated. Fixes: c0087d807ae8 ("s390/vdso: Rename vdso64 to vdso") Signed-off-by: Thomas Weißschuh Acked-by: Heiko Carstens Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin

selftests/arm64: Fix MTE prctl TAP plan

2026-09-14T11:36:14+00:00

[ Upstream commit bb52892f9234e4ecd982fa51222aab33ce282f79 ] The MTE prctl test emits one result from check_basic_read() followed by one result for each of the seven entries in mte_modes[]. However, the TAP plan only accounts for the array entries, producing: # Planned tests != run tests (7 != 8) Include the basic read check in the plan so that all eight emitted results are declared. Reviewed-by: Mark Brown Fixes: 1f488fb91378 ("kselftest/arm64/mte: Add MTE_STORE_ONLY testcases") Signed-off-by: Muhammad Usama Anjum Reviewed-by: Vincenzo Frascino Signed-off-by: Will Deacon Signed-off-by: Sasha Levin

selftests/arm64: Treat KSM merge_across_nodes as optional

2026-09-14T11:36:14+00:00

[ Upstream commit 1a0dba077f34a2f8faa98308d30d4b546d073145 ] The MTE KSM test requires write access to KSM sysfs but does not check that it is running as root. It also unconditionally saves, enables and restores the merge_across_nodes attribute. The kernel only creates this attribute when CONFIG_NUMA=y, so a non-NUMA kernel prints the following message three times even though every KSM subtest passes: # ERR: missing /sys/kernel/mm/ksm/merge_across_nodes Skip the test when it is not running as root. Check that the optional attribute is readable and writable, treating ENOENT as its expected absence on non-NUMA kernels and skipping the test for other access failures. Only save, enable and restore the attribute when it is available. Check MTE availability before the privilege and sysfs checks so systems without MTE retain the existing feature-unavailable skip result. This preserves the existing behavior on NUMA kernels without requiring NUMA or reducing KSM coverage on single-node systems. Fixes: f981d8fa2646 ("kselftest/arm64: Verify KSM page merge for MTE pages") Signed-off-by: Muhammad Usama Anjum Reviewed-by: Vincenzo Frascino Reviewed-by: Mark Brown Signed-off-by: Will Deacon Signed-off-by: Sasha Levin

selftests/arm64: Print missing MTE TAP headers

2026-09-14T11:36:14+00:00

[ Upstream commit 8d2237e9d6902e234bb89aabb9cd6a9e91357223 ] Most MTE tests set a TAP plan and emit results without first printing the TAP version header. Direct execution therefore starts with a plan such as "1..20" instead of "TAP version 13". The problem is particularly visible in the GCR_EL1 context-switch test. It prints its plan before forking 1,024 child processes. When stdout is fully buffered, the plan remains in the stdio buffer. Each child inherits the pending "1..1" line and flushes its copy from exit(), producing repeated plan lines. ksft_print_header() prints the TAP header and enables line buffering. Call it in every MTE test that is missing it. In the GCR_EL1 test, call it before the plan so the plan is flushed before the children are forked. In the remaining tests, call it before setup and prerequisite checks so early failures and whole-test skips also retain the header. Fixes: 29f080881601 ("kselftest/arm64: check GCR_EL1 after context switch") Signed-off-by: Muhammad Usama Anjum Reviewed-by: Vincenzo Frascino Reviewed-by: Mark Brown Signed-off-by: Will Deacon Signed-off-by: Sasha Levin

selftests/proc: make proc-maps-race work with READ_IMPLIES_EXEC

2026-09-14T11:36:12+00:00

[ Upstream commit 0685630fdccb62dcb0e3f44525a40578da5f6dc8 ] test_maps_tearing_from_split times out when READ_IMPLIES_EXEC is set. This happens by default on pre-ARMv6 CPUs, which lack no-execute support. split_vma() re-maps the first page with mod_info->prot | PROT_EXEC to make it differ from its neighbours. With READ_IMPLIES_EXEC the original mapping is already executable, so no split occurs and the test hangs waiting for the modifier child. Use PROT_NONE for the split mapping, which always differs from its readable neighbours. Link: https://lore.kernel.org/20260808200312.6326-1-kmehltretter@gmail.com Fixes: beb69e817246 ("selftests/proc: add /proc/pid/maps tearing from vma split test") Assisted-by: Codex:gpt-5.6-terra Signed-off-by: Karl Mehltretter Acked-by: Suren Baghdasaryan Cc: Alexey Dobriyan Cc: Jann Horn Cc: Liam R. Howlett Cc: Shuah Khan Cc: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin

selftests/mm: skip COW tmpfile cases when fallocate() is unsupported

2026-09-14T11:36:12+00:00

[ Upstream commit 4004c130c358b1561a55323b0e747f20f5133f7b ] Patch series "selftests/mm: Handle unsupported and transient test conditions", v3. Several MM selftests report failures when the test environment lacks an underlying prerequisite, such as fallocate() support, MADV_REMOVE, local page-cache semantics, or swap. This series converts those unsupported cases to SKIP while preserving failures for unexpected errors. It also allows migration tests to retry transient move_pages() failures. This patch (of 4): The tmpfile-backed COW cases allocate a one-page file with fallocate() before exercising private and shared mappings. When the filesystem backing tmpfile() does not implement fallocate(), setup fails with EOPNOTSUPP and no COW behavior is exercised. This occurs when the temporary directory resides on a filesystem with limited allocation support, such as NFSv3. Reporting a failure adds noise because the test prerequisite is absent rather than the COW implementation being broken. Report EOPNOTSUPP as a skip. Continue treating every other fallocate() error as a failure so unexpected setup regressions remain visible. Link: https://lore.kernel.org/20260727095225.372655-1-usama.anjum@arm.com Link: https://lore.kernel.org/20260727095225.372655-2-usama.anjum@arm.com Fixes: f8664f3c4a08 ("selftests/vm: cow: basic COW tests for non-anonymous pages") Signed-off-by: Muhammad Usama Anjum Tested-by: Sarthak Sharma Acked-by: Usama Arif Acked-by: David Hildenbrand (Arm) Cc: Baolin Wang Cc: Barry Song Cc: Dev Jain Cc: Lance Yang Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Miaohe Lin Cc: Michal Hocko Cc: Mike Rapoport Cc: Naoya Horiguchi Cc: Nico Pache Cc: Ryan Roberts Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin

selftests/sched_ext: Fix flaky ddsp failure tests on busy systems

2026-09-14T11:35:57+00:00

[ Upstream commit e72979d3264a87a6a2dfb44fe0f5723a17d2ef84 ] The ddsp_vtimelocal_fail and ddsp_bogus_dsq_fail tests skip calling scx_bpf_dsq_insert_vtime() if scx_bpf_pick_idle_cpu() fails to find an idle CPU (returns a negative error code). On loaded systems, this results in the tests skipping the very assertions they are meant to verify. Eliminate this flakiness by falling back to prev_cpu if no idle CPU is found, ensuring the illegal dispatch operations are unconditionally attempted and tested. Fixes: a5db7817af78 ("sched_ext: Add selftests") Signed-off-by: Michal Blaszczyk Signed-off-by: Tejun Heo Signed-off-by: Sasha Levin

selftests/bpf: Use ping_command() for IPv6 pings in lwt_ip_encap

2026-09-14T11:35:56+00:00

[ Upstream commit 073574da7a8e6055b1687c256bea070ab4b4ebea ] lwt_ip_encap hardcodes the ping6 binary for its IPv6 pings. iputils merged ping6 into ping long ago and distros have started dropping the compat symlink -- Arch's iputils 20250605 ships only arping, clockdiff, ping and tracepath. There, every lwt_ip_encap subtest fails: check_ping_ok:FAIL:ip netns exec ns-lwt-ip-encap-1-0101330 ping6 -c 1 \ -W1 -I veth1 fb04::1 > /dev/null unexpected error: 256 (errno 2) #217/1 lwt_ip_encap_ipv4/egress:FAIL The IPv4 subtests fail too, because check_ping_ok() pings both families. SYS() runs the command through system(), so a missing binary is indistinguishable from an unreachable peer. network_helpers.c has had ping_command() for exactly this since commit 372642ea83ff ("selftests/bpf: Move netcnt test under test_progs"): it falls back to "ping -6" when ping6 is not present. lwt_ip_encap.c is the last hardcoded ping6 user. Fix that. Fixes: f5e288943e2c ("selftests/bpf: Move test_lwt_ip_encap to test_progs") Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20260813213558.3103179-1-andrii@kernel.org Signed-off-by: Sasha Levin

selftests/bpf: Add tests to verify the fix of encapsulating VxLAN in lwt

2026-09-14T11:35:56+00:00

[ Upstream commit 5477d55f351fea3eeb2c5c77a9224eed0fd4d6a9 ] Add two tests to verify the transport header of skb has been set when encapsulate VxLAN using bpf_lwt_push_encap() helper. 1. VxLAN over IPv4. 2. VxLAN over IPv6. Without the fix, the tests would fail: lwt_ip_encap_vxlan:FAIL:transport_hdr offset unexpected transport_hdr offset: actual 70 != expected 20 #208 lwt_ip_encap_vxlan_ipv4:FAIL lwt_ip_encap_vxlan:FAIL:transport_hdr offset unexpected transport_hdr offset: actual 110 != expected 40 #209 lwt_ip_encap_vxlan_ipv6:FAIL The unexpected offsets are: outer encap headers (IPv4: iphdr+udp+vxlan+eth = 50 bytes, IPv6: ipv6hdr+udp+vxlan+eth = 70 bytes) plus the inner IP header (20 or 40 bytes), because without the fix transport_header still points at the inner transport layer instead of the outer UDP header. Assisted-by: Claude:claude-sonnet-4-6 Cc: Leon Hwang Signed-off-by: Leon Hwang Link: https://lore.kernel.org/r/20260602150931.49629-3-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov Stable-dep-of: 073574da7a8e ("selftests/bpf: Use ping_command() for IPv6 pings in lwt_ip_encap") Signed-off-by: Sasha Levin

selftests/bpf: Fix for veristat file/prog filters processing

2026-09-14T11:35:55+00:00

[ Upstream commit 98d309ec8189fd91698d1a72946c3d888270c57e ] At the moment veristat filtering behaves unexpectedly for the following filter expression: -f !file/prog The expression rejects all programs with name 'prog', and all programs in a file with name 'file'. This commit fixes the expression to exclude only a program 'prog' from a file 'file'. Additionally, the commit makes empty filters like '-f ""' or '-f "/"' and error. Here is the filtering behaviour compared old versus new: | filter | file | prog | old verdict | new verdict | |----------+------+------+-------------+-------------| | !foo | foo | bar | skipped | skipped | | !foo | bar | foo | skipped | skipped | | !foo | bar | bar | processed | processed | | !foo/bar | foo | bar | skipped | skipped | | !foo/bar | foo | buz | skipped | processed | (!) | !foo/bar | bar | bar | skipped | processed | (!) | !foo/ | foo | bar | skipped | skipped | | !foo/ | bar | bar | processed | processed | | !/bar | foo | bar | skipped | skipped | | !/bar | foo | foo | processed | processed | | !/ | foo | bar | processed | error | (!) | ! | foo | bar | processed | error | (!) |----------+------+------+-------------+-------------| | foo | foo | bar | processed | processed | | foo | bar | foo | processed | processed | | foo | bar | bar | skipped | skipped | | foo/bar | foo | bar | processed | processed | | foo/bar | foo | buz | skipped | skipped | | foo/bar | bar | bar | skipped | skipped | | foo/ | foo | bar | processed | processed | | foo/ | bar | bar | skipped | skipped | | /bar | foo | bar | processed | processed | | /bar | foo | foo | skipped | skipped | | / | foo | bar | processed | error | (!) | | foo | bar | skipped | error | (!) Fixes: 10b1b3f3e56a ("selftests/bpf: consolidate and improve file/prog filtering in veristat") Signed-off-by: Eduard Zingerman Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20260811-veristat-filter-fix-v2-1-6c234c4cd6ef@gmail.com Signed-off-by: Sasha Levin