Re: [Crash-utility] invalid structure member offset: page_active #115

Hi. update patch: From: xiaer1921 <xiaer1921(a)gmail.com&gt; Date: Tue, 29 Mar 2022 20:03:03 +0800 Subject: [PATCH] Fix for "kmem -s|-S" on Linux 5.17.0+ 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") 401fb12c68c2 ("mm: Differentiate struct slab fields by sl*b implementations") 07f910f9b729 ("mm: Remove slab from struct page") Without the patch, "kmem -s|-S" options cannot work correctly with the following errors: crash> kmem -s kmem: invalid structure member offset: page_active FILE: memory.c LINE: 12225 FUNCTION: verify_slab_overload_page() [/usr/bin/crash] error trace: 532526 => 53353a => 5e0a6a => 5e09dc [Detaching after fork from child process 28299] 5e09dc: OFFSET_verify.part.36+92 [Detaching after fork from child process 28301] 5e0a6a: OFFSET_verify+58 [Detaching after fork from child process 28303] 53353a: verify_slab_overload_page+588 [Detaching after fork from child process 28305] 532526: do_slab_chain_slab_overload_page+1171 kmem: invalid structure member offset: page_active FILE: memory.c LINE: 12225 FUNCTION: verify_slab_overload_page() Signed-off-by: xiaer1921 <xiaer1921(a)gmail.com&gt; --- memory.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/memory.c b/memory.c index 8448ddc..6240d4c 100644 --- a/memory.c +++ b/memory.c @@ -680,6 +680,12 @@ vm_init(void) MEMBER_OFFSET_INIT(slab_s_mem, "slab", "s_mem"); MEMBER_OFFSET_INIT(slab_inuse, "slab", "inuse"); MEMBER_OFFSET_INIT(slab_free, "slab", "free"); + if (INVALID_MEMBER(page_s_mem)) + MEMBER_OFFSET_INIT(page_s_mem, "slab", "s_mem"); + if (INVALID_MEMBER(page_active)) + MEMBER_OFFSET_INIT(page_active, "slab", "active"); + if (INVALID_MEMBER(page_freelist)) + MEMBER_OFFSET_INIT(page_freelist, "slab", "freelist"); /* * slab members were moved to an anonymous union in 2.6.39. */ @@ -691,6 +697,12 @@ vm_init(void) ANON_MEMBER_OFFSET_INIT(slab_inuse, "slab", "inuse"); if (INVALID_MEMBER(slab_free)) ANON_MEMBER_OFFSET_INIT(slab_free, "slab", "free"); + if (INVALID_MEMBER(page_s_mem)) + ANON_MEMBER_OFFSET_INIT(page_s_mem, "slab", "s_mem"); + if (INVALID_MEMBER(page_active)) + ANON_MEMBER_OFFSET_INIT(page_active, "slab", "active"); + if (INVALID_MEMBER(page_freelist)) + ANON_MEMBER_OFFSET_INIT(page_freelist, "slab", "freelist"); } MEMBER_OFFSET_INIT(array_cache_avail, "array_cache", "avail"); -- 2.7.4 在 2022/3/29 下午8:20, sholck 写道: