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 enabled, __free_pages() invokes debug_pagealloc_unmap_pages(), clearing the _PAGE_PRESENT bit for freed pages in the direct mapping. Commit 3dc92c311498 ("kexec: add Kexec HandOver (KHO) generation helpers") releases the KHO scratch region via init_cma_reserved_pageblock(), unmapping its physical pages. Subsequent kmemleak scanning accesses these unmapped pages, triggering fatal page faults. Call kmemleak_no_scan_phys() from kho_reserve_scratch() to exclude the reserved region from scanning before it is released to the buddy allocator. Fixes: 3dc92c311498 ("kexec: add Kexec HandOver (KHO) generation helpers") Signed-off-by: Ran Xiaokai --- kernel/liveupdate/kexec_handover.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c index 224bdf5becb6..dd4942d1d76c 100644 --- a/kernel/liveupdate/kexec_handover.c +++ b/kernel/liveupdate/kexec_handover.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -654,6 +655,7 @@ static void __init kho_reserve_scratch(void) if (!addr) goto err_free_scratch_desc; + kmemleak_no_scan_phys(addr); kho_scratch[i].addr = addr; kho_scratch[i].size = size; i++; @@ -664,6 +666,7 @@ static void __init kho_reserve_scratch(void) if (!addr) goto err_free_scratch_areas; + kmemleak_no_scan_phys(addr); kho_scratch[i].addr = addr; kho_scratch[i].size = size; i++; @@ -676,6 +679,7 @@ static void __init kho_reserve_scratch(void) if (!addr) goto err_free_scratch_areas; + kmemleak_no_scan_phys(addr); kho_scratch[i].addr = addr; kho_scratch[i].size = size; i++; -- 2.25.1