linux.git/tools/testing/selftests/namespaces/listns_efault_test.c, branch master

selftests/namespaces: Skip efault tests when listns() is not available

2026-05-11T10:25:32+00:00

When listns() is not implemented the iterator child detects ENOSYS and exits cleanly with status PIDFD_SKIP before the parent has a chance to signal it. The parent sends SIGKILL (which is a harmless no-op at that point) and then calls waitpid(), obtaining a normal-exit status. The subsequent ASSERT_TRUE(WIFSIGNALED(status)) therefore fails, causing the three EFAULT-focused tests to report FAIL rather than SKIP on kernels that do not yet carry listns() support. After collecting the iterator's exit status, check whether it exited with PIDFD_SKIP and issue a SKIP verdict in that case, consistent with the behaviour of every other listns test that already handles ENOSYS correctly. Signed-off-by: Ricardo B. Marlière Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-3-59109909d88b@suse.com Signed-off-by: Christian Brauner

selftests/namespaces: Fix waitpid race in listns_efault_test cleanup

2026-05-11T10:25:32+00:00

The efault tests spawn two categories of child processes: namespace children (each in its own mount namespace, for concurrent destruction) and an iterator child that calls listns() in a tight loop. The cleanup loop used waitpid(-1), which reaps any child in any order. If the iterator child exits early (e.g. because listns() returned ENOSYS) before all namespace children have been reaped, waitpid(-1) may consume it instead. The subsequent targeted waitpid(iter_pid) would then block indefinitely. Track the PIDs of the namespace children explicitly and use targeted waitpid() calls in the cleanup loop so the iterator child cannot be inadvertently reaped during namespace cleanup. Signed-off-by: Ricardo B. Marlière Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-2-59109909d88b@suse.com Signed-off-by: Christian Brauner

selftests/namespaces: remove unused utils.h include from listns_efault_test

2026-04-14T07:31:18+00:00

Remove the inclusion of ../filesystems/utils.h from listns_efault_test.c. The test doesn't use any symbols from that header. Including it alongside ../pidfd/pidfd.h causes a build failure because both headers define wait_for_pid() with conflicting linkage: ../filesystems/utils.h: extern int wait_for_pid(pid_t pid); ../pidfd/pidfd.h: static inline int wait_for_pid(pid_t pid) All symbols the test actually uses (create_child, read_nointr, write_nointr, sys_pidfd_send_signal) come from pidfd.h. Reported-by: Mark Brown Link: https://lore.kernel.org/all/acPV19IY3Gna6Ira@sirena.org.uk Fixes: 07d7ad46dad4 ("selftests/namespaces: test for efault") Signed-off-by: Christian Brauner

selftests/namespaces: test for efault

2025-11-10T14:53:56+00:00

Ensure that put_user() can fail and that namespace cleanup works correctly. Link: https://patch.msgid.link/20251109-namespace-6-19-fixes-v1-8-ae8a4ad5a3b3@kernel.org Signed-off-by: Christian Brauner