From: Ran Xiaokai When booting with debug_pagealloc=on while having: CONFIG_KEXEC_HANDOVER_ENABLE_DEFAULT=y CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=n the system fails to boot due to page faults during kmemleak scanning. This occurs because: With debug_pagealloc is enabled, __free_pages() invokes debug_pagealloc_unmap_pages(), clearing the _PAGE_PRESENT bit for freed pages in the kernel page table. Commit 3dc92c311498 ("kexec: add Kexec HandOver (KHO) generation helpers") triggers this when releases the KHO scratch region calling init_cma_reserved_pageblock(). Subsequent kmemleak scanning accesses these non-PRESENT pages, leading to fatal page faults. Call kmemleak_ignore_phys() from kho_init() to exclude the reserved region from kmemleak scanning before it is released to the buddy allocator to fix this. Signed-off-by: Ran Xiaokai --- kernel/liveupdate/kexec_handover.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c index 224bdf5becb6..c729d455ee7b 100644 --- a/kernel/liveupdate/kexec_handover.c +++ b/kernel/liveupdate/kexec_handover.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -1369,6 +1370,7 @@ static __init int kho_init(void) unsigned long count = kho_scratch[i].size >> PAGE_SHIFT; unsigned long pfn; + kmemleak_ignore_phys(kho_scratch[i].addr); for (pfn = base_pfn; pfn < base_pfn + count; pfn += pageblock_nr_pages) init_cma_reserved_pageblock(pfn_to_page(pfn)); -- 2.25.1