/proc/pid/stack - kernel stack

/proc/pid/stack (since Linux 2.6.29) This file provides a symbolic trace of the function calls in this process's kernel stack. This file is provided only if the kernel was built with the CONFIG_STACKTRACE configuration option. Permission to access this file is governed by a ptrace access mode PTRACE_MODE_ATTACH_FSCREDS check; see ptrace(2).

/proc/pid/stack - kernel stack

proc(5) Linux man-pages 6.9.1 2024-05-02 proc_pid_stack(5)