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After calling fork() in test_prctl_fork_exec(), the global variable ksm_full_scans_fd is initialized to 0 in the child process upon entering the main function of ./ksm_functional_tests. In the function call chain test_child_ksm() -> __mmap_and_merge_range -> ksm_merge-> ksm_get_full_scans, start_scans = ksm_get_full_scans() will return an error. Therefore, the value of ksm_full_scans_fd needs to be initialized before calling test_child_ksm in the child process. Link: https://lkml.kernel.org/r/20240617052934.5834-1-shechenglong001@gmail.com Signed-off-by: aigourensheng <shechenglong001@gmail.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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