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In sigtrap_threads(), the return value of mmap() is checked against NULL. mmap() returns MAP_FAILED, which is (void *)-1, not NULL, when it fails. Since MAP_FAILED is non-zero and non-NULL, the condition "p == NULL" will never be true on failure, causing the program to proceed with an invalid pointer and segfault if mmap() actually fails under memory pressure. Link: https://lore.kernel.org/20260513025838.594945-1-lihongfu@kylinos.cn Signed-off-by: Hongfu Li <lihongfu@kylinos.cn> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Mickael Salaun <mic@digikod.net> Cc: SeongJae Park <sj@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: Kyle Huey <khuey@kylehuey.com> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>