2023-06-07 03:37:41 +00:00
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From 342cf340ed0386880fe2a3115d6bef32eabb511b Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Thu, 18 May 2023 11:48:28 +0900
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2023-09-11 08:55:01 +00:00
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Subject: [PATCH 03/30] Fix "kmem -v" option displaying no regions on Linux 6.3
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2023-06-07 03:37:41 +00:00
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and later
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Kernel commit 869176a09606 ("mm/vmalloc.c: add flags to mark vm_map_ram
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area"), which is contained in Linux 6.3 and later, added "flags" member
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to struct vmap_area. This was the revival of the "flags" member as
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kernel commit 688fcbfc06e4 had eliminated it before.
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As a result, crash started to use the old procedure using the member and
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displays no vmalloc'd regions, because it does not have the same flag
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value as the old one.
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crash> kmem -v
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VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE
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crash>
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To fix this, also check if vmap_area.purge_list exists, which was
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introduced with the flags and removed later, to determine that the flags
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member is the old one.
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Related vmap_area history:
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v2.6.28 db64fe02258f introduced vmap_area with flags and purge_list
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v5.4 688fcbfc06e4 removed flags
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v5.11 96e2db456135 removed purge_list
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v6.3 869176a09606 added flags again
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Signed-off-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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defs.h | 1 +
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memory.c | 4 +++-
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symbols.c | 1 +
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3 files changed, 5 insertions(+), 1 deletion(-)
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diff --git a/defs.h b/defs.h
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index 21cc760444d1..bfa07c3f5150 100644
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--- a/defs.h
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+++ b/defs.h
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@@ -2216,6 +2216,7 @@ struct offset_table { /* stash of commonly-used offsets */
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long in6_addr_in6_u;
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long kset_kobj;
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long subsys_private_subsys;
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+ long vmap_area_purge_list;
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};
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struct size_table { /* stash of commonly-used sizes */
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diff --git a/memory.c b/memory.c
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index 953fc380c03c..15fa8b2f08f1 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -429,6 +429,7 @@ vm_init(void)
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MEMBER_OFFSET_INIT(vmap_area_vm, "vmap_area", "vm");
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if (INVALID_MEMBER(vmap_area_vm))
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MEMBER_OFFSET_INIT(vmap_area_vm, "vmap_area", "private");
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+ MEMBER_OFFSET_INIT(vmap_area_purge_list, "vmap_area", "purge_list");
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STRUCT_SIZE_INIT(vmap_area, "vmap_area");
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if (VALID_MEMBER(vmap_area_va_start) &&
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VALID_MEMBER(vmap_area_va_end) &&
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@@ -9063,7 +9064,8 @@ dump_vmap_area(struct meminfo *vi)
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readmem(ld->list_ptr[i], KVADDR, vmap_area_buf,
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SIZE(vmap_area), "vmap_area struct", FAULT_ON_ERROR);
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- if (VALID_MEMBER(vmap_area_flags)) {
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+ if (VALID_MEMBER(vmap_area_flags) &&
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+ VALID_MEMBER(vmap_area_purge_list)) {
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flags = ULONG(vmap_area_buf + OFFSET(vmap_area_flags));
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if (flags != VM_VM_AREA)
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continue;
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diff --git a/symbols.c b/symbols.c
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index f0721023816d..7b1d59203b90 100644
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--- a/symbols.c
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+++ b/symbols.c
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@@ -9169,6 +9169,7 @@ dump_offset_table(char *spec, ulong makestruct)
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OFFSET(vmap_area_vm));
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fprintf(fp, " vmap_area_flags: %ld\n",
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OFFSET(vmap_area_flags));
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+ fprintf(fp, " vmap_area_purge_list: %ld\n", OFFSET(vmap_area_purge_list));
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fprintf(fp, " module_size_of_struct: %ld\n",
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OFFSET(module_size_of_struct));
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--
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2.37.1
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