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From 86446eaba408807e00cf2310d5748aa6b7511284 Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Wed, 2 Feb 2022 02:14:56 +0000
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Subject: [PATCH 11/11] Fix for "kmem -s|-S" and "bt -F[F]" on Linux 5.17-rc1
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Since the following kernel commits split slab info from struct page
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into struct slab, crash cannot get several slab related offsets from
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struct page.
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d122019bf061 ("mm: Split slab into its own type")
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07f910f9b729 ("mm: Remove slab from struct page")
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Without the patch, "kmem -s|-S" and "bt -F[F]" options cannot work
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correctly with the following errors:
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crash> kmem -s kmem_cache
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CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME
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kmem: page_to_nid: invalid page: ffff9454afc35020
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kmem: kmem_cache: cannot gather relevant slab data
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ffff945140042000 216 ? ? ? 8k kmem_cache
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crash> bt -F
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...
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bt: invalid structure member offset: page_slab
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FILE: memory.c LINE: 9477 FUNCTION: vaddr_to_kmem_cache()
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Signed-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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memory.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/memory.c b/memory.c
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index e80c59ea4534..8448ddc3a16c 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -421,6 +421,8 @@ vm_init(void)
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MEMBER_OFFSET_INIT(page_prev, "page", "prev");
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if (INVALID_MEMBER(page_next))
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ANON_MEMBER_OFFSET_INIT(page_next, "page", "next");
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+ if (INVALID_MEMBER(page_next))
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+ MEMBER_OFFSET_INIT(page_next, "slab", "next");
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MEMBER_OFFSET_INIT(page_list, "page", "list");
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if (VALID_MEMBER(page_list)) {
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@@ -747,11 +749,15 @@ vm_init(void)
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MEMBER_OFFSET_INIT(kmem_cache_random, "kmem_cache", "random");
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MEMBER_OFFSET_INIT(kmem_cache_cpu_freelist, "kmem_cache_cpu", "freelist");
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MEMBER_OFFSET_INIT(kmem_cache_cpu_page, "kmem_cache_cpu", "page");
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+ if (INVALID_MEMBER(kmem_cache_cpu_page))
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+ MEMBER_OFFSET_INIT(kmem_cache_cpu_page, "kmem_cache_cpu", "slab");
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MEMBER_OFFSET_INIT(kmem_cache_cpu_node, "kmem_cache_cpu", "node");
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MEMBER_OFFSET_INIT(kmem_cache_cpu_partial, "kmem_cache_cpu", "partial");
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MEMBER_OFFSET_INIT(page_inuse, "page", "inuse");
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if (INVALID_MEMBER(page_inuse))
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ANON_MEMBER_OFFSET_INIT(page_inuse, "page", "inuse");
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+ if (INVALID_MEMBER(page_inuse))
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+ MEMBER_OFFSET_INIT(page_inuse, "slab", "inuse");
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MEMBER_OFFSET_INIT(page_offset, "page", "offset");
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if (INVALID_MEMBER(page_offset))
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ANON_MEMBER_OFFSET_INIT(page_offset, "page", "offset");
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@@ -763,6 +769,9 @@ vm_init(void)
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if (INVALID_MEMBER(page_slab))
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ANON_MEMBER_OFFSET_INIT(page_slab, "page", "slab_cache");
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}
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+ if (INVALID_MEMBER(page_slab))
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+ MEMBER_OFFSET_INIT(page_slab, "slab", "slab_cache");
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+
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MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
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if (INVALID_MEMBER(page_slab_page))
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ANON_MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
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@@ -772,10 +781,14 @@ vm_init(void)
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MEMBER_OFFSET_INIT(page_freelist, "page", "freelist");
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if (INVALID_MEMBER(page_freelist))
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ANON_MEMBER_OFFSET_INIT(page_freelist, "page", "freelist");
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+ if (INVALID_MEMBER(page_freelist))
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+ MEMBER_OFFSET_INIT(page_freelist, "slab", "freelist");
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if (INVALID_MEMBER(kmem_cache_objects)) {
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MEMBER_OFFSET_INIT(kmem_cache_oo, "kmem_cache", "oo");
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/* NOTE: returns offset of containing bitfield */
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ANON_MEMBER_OFFSET_INIT(page_objects, "page", "objects");
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+ if (INVALID_MEMBER(page_objects))
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+ ANON_MEMBER_OFFSET_INIT(page_objects, "slab", "objects");
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}
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if (VALID_MEMBER(kmem_cache_node)) {
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ARRAY_LENGTH_INIT(len, NULL, "kmem_cache.node", NULL, 0);
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--
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2.20.1
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