Since the following kernel commits split slab info from struct page into struct slab, crash cannot get several slab related offsets from struct page. d122019bf061 ("mm: Split slab into its own type") 07f910f9b729 ("mm: Remove slab from struct page") Without the patch, "kmem -s|-S" and "bt -F[F]" options cannot work correctly with the following errors: crash> kmem -s kmem_cache CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME kmem: page_to_nid: invalid page: ffff9454afc35020 kmem: kmem_cache: cannot gather relevant slab data ffff945140042000 216 ? ? ? 8k kmem_cache crash> bt -F ... bt: invalid structure member offset: page_slab FILE: memory.c LINE: 9477 FUNCTION: vaddr_to_kmem_cache() Signed-by: Kazuhito Hagio <k-hagio-ab(a)nec.com&gt; --- memory.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/memory.c b/memory.c index e80c59ea4534..8448ddc3a16c 100644 --- a/memory.c +++ b/memory.c @@ -421,6 +421,8 @@ vm_init(void) MEMBER_OFFSET_INIT(page_prev, "page", "prev"); if (INVALID_MEMBER(page_next)) ANON_MEMBER_OFFSET_INIT(page_next, "page", "next"); + if (INVALID_MEMBER(page_next)) + MEMBER_OFFSET_INIT(page_next, "slab", "next"); MEMBER_OFFSET_INIT(page_list, "page", "list"); if (VALID_MEMBER(page_list)) { @@ -747,11 +749,15 @@ vm_init(void) MEMBER_OFFSET_INIT(kmem_cache_random, "kmem_cache", "random"); MEMBER_OFFSET_INIT(kmem_cache_cpu_freelist, "kmem_cache_cpu", "freelist"); MEMBER_OFFSET_INIT(kmem_cache_cpu_page, "kmem_cache_cpu", "page"); + if (INVALID_MEMBER(kmem_cache_cpu_page)) + MEMBER_OFFSET_INIT(kmem_cache_cpu_page, "kmem_cache_cpu", "slab"); MEMBER_OFFSET_INIT(kmem_cache_cpu_node, "kmem_cache_cpu", "node"); MEMBER_OFFSET_INIT(kmem_cache_cpu_partial, "kmem_cache_cpu", "partial"); MEMBER_OFFSET_INIT(page_inuse, "page", "inuse"); if (INVALID_MEMBER(page_inuse)) ANON_MEMBER_OFFSET_INIT(page_inuse, "page", "inuse"); + if (INVALID_MEMBER(page_inuse)) + MEMBER_OFFSET_INIT(page_inuse, "slab", "inuse"); MEMBER_OFFSET_INIT(page_offset, "page", "offset"); if (INVALID_MEMBER(page_offset)) ANON_MEMBER_OFFSET_INIT(page_offset, "page", "offset"); @@ -763,6 +769,9 @@ vm_init(void) if (INVALID_MEMBER(page_slab)) ANON_MEMBER_OFFSET_INIT(page_slab, "page", "slab_cache"); } + if (INVALID_MEMBER(page_slab)) + MEMBER_OFFSET_INIT(page_slab, "slab", "slab_cache"); + MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page"); if (INVALID_MEMBER(page_slab_page)) ANON_MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page"); @@ -772,10 +781,14 @@ vm_init(void) MEMBER_OFFSET_INIT(page_freelist, "page", "freelist"); if (INVALID_MEMBER(page_freelist)) ANON_MEMBER_OFFSET_INIT(page_freelist, "page", "freelist"); + if (INVALID_MEMBER(page_freelist)) + MEMBER_OFFSET_INIT(page_freelist, "slab", "freelist"); if (INVALID_MEMBER(kmem_cache_objects)) { MEMBER_OFFSET_INIT(kmem_cache_oo, "kmem_cache", "oo"); /* NOTE: returns offset of containing bitfield */ ANON_MEMBER_OFFSET_INIT(page_objects, "page", "objects"); + if (INVALID_MEMBER(page_objects)) + ANON_MEMBER_OFFSET_INIT(page_objects, "slab", "objects"); } if (VALID_MEMBER(kmem_cache_node)) { ARRAY_LENGTH_INIT(len, NULL, "kmem_cache.node", NULL, 0); -- 2.27.0