When percpu data is in vmalloc area (pcpu_page_first_chunk fallback on large NUMA systems), arm64_kvtop() cannot translate vmalloc addresses during POST_GDB because vt->vmalloc_start is not yet initialized by vm_init(). Moving the stack init functions to POST_VM ensures vt->vmalloc_start and vt->kernel_pgd are ready before readmem calls. Signed-off-by: Chen Haixiang <chenhaixiang3(a)h-partners.com&gt; --- arm64.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arm64.c b/arm64.c index d177092..654b972 100644 --- a/arm64.c +++ b/arm64.c @@ -787,7 +787,9 @@ arm64_init(int when) */ if(!machdep->machspec->CONFIG_ARM64_KERNELPACMASK) arm64_recalc_KERNELPACMASK(); + break; + case POST_VM: arm64_irq_stack_init(); arm64_overflow_stack_init(); arm64_stackframe_init(); -- 2.41.0