On Wed, Feb 22, 2023 at 5:36 PM <crash-utility-request@xxxxxxxxxx> wrote:
Date: Wed, 22 Feb 2023 14:32:09 +0800
From: Tao Liu <ltao@xxxxxxxxxx>
To: crash-utility@xxxxxxxxxx
Subject: [PATCH] Fix for "search" command failing in
maple tree kernel
Message-ID: <20230222063208.96447-1-ltao@xxxxxxxxxx>
Content-Type: text/plain; charset="US-ASCII"; x-default=true
Kernel with maple tree enabled doesn't have mmap as a member of mm_struct[1],
so OFFSET(mm_struct_mmap) case needed to be handled differently for
maple tree kernel.
Thank you for the fix, Tao. We missed this case last time.
For the patch with Kazu's warning fix: Ack.
Thanks.
Lianbo
Before:
crash> search -u a
search: invalid structure member offset: mm_struct_mmap
FILE: memory.c LINE: 14255 FUNCTION: address_space_start()
[crash] error trace: 549500 => 548fff => 5f1c91 => 5f1c13
5f1c13: OFFSET_verify.part.36+51
5f1c91: OFFSET_verify+49
548fff: address_space_start+106
549500: cmd_search+855
search: invalid structure member offset: mm_struct_mmap
FILE: memory.c LINE: 14255 FUNCTION: address_space_start()
After:
crash> search -u a
7ffea63e6440: a
[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=763ecb035029f500d7e6dc99acd1ad299b7726a1
Signed-off-by: Tao Liu <ltao@xxxxxxxxxx>
---
memory.c | 87 ++++++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 65 insertions(+), 22 deletions(-)
diff --git a/memory.c b/memory.c
index d9cd616..63ea9f4 100644
--- a/memory.c
+++ b/memory.c
@@ -14245,14 +14245,28 @@ vaddr_type(ulong vaddr, struct task_context *tc)
static int
address_space_start(struct task_context *tc, ulong *addr)
{
- ulong vma;
+ ulong mm_mt, entry_num, i, vma = 0;
char *vma_buf;
+ struct list_pair *entry_list;
if (!tc->mm_struct)
return FALSE;
- fill_mm_struct(tc->mm_struct);
- vma = ULONG(tt->mm_struct + OFFSET(mm_struct_mmap));
+ if (INVALID_MEMBER(mm_struct_mmap) && VALID_MEMBER(mm_struct_mm_mt)) {
+ mm_mt = tc->mm_struct + OFFSET(mm_struct_mm_mt);
+ entry_num = do_maple_tree(mm_mt, MAPLE_TREE_COUNT, NULL);
+ entry_list = (struct list_pair *)GETBUF(entry_num * sizeof(struct list_pair));
+ do_maple_tree(mm_mt, MAPLE_TREE_GATHER, entry_list);
+ for (i = 0; i < entry_num; i++) {
+ if (!!(vma = (ulong)entry_list[i].value))
+ break;
+ }
+ FREEBUF(entry_list);
+ } else {
+ fill_mm_struct(tc->mm_struct);
+ vma = ULONG(tt->mm_struct + OFFSET(mm_struct_mmap));
+ }
+
if (!vma)
return FALSE;
vma_buf = fill_vma_cache(vma);
@@ -15491,6 +15505,30 @@ search_physical(struct searchinfo *si)
FREEBUF(pagebuf);
}
+static bool
+check_vma(ulong vma, ulong vaddr, ulong *vm_next, ulong *nextvaddr)
+{
+ char *vma_buf;
+ ulong vm_start, vm_end;
+
+ vma_buf = fill_vma_cache(vma);
+
+ vm_start = ULONG(vma_buf + OFFSET(vm_area_struct_vm_start));
+ vm_end = ULONG(vma_buf + OFFSET(vm_area_struct_vm_end));
+ if (vm_next)
+ *vm_next = ULONG(vma_buf + OFFSET(vm_area_struct_vm_next));
+
+ if (vaddr <= vm_start) {
+ *nextvaddr = vm_start;
+ return TRUE;
+ }
+
+ if ((vaddr > vm_start) && (vaddr < vm_end)) {
+ *nextvaddr = vaddr;
+ return TRUE;
+ }
+ return FALSE;
+}
/*
* Return the next mapped user virtual address page that comes after
@@ -15503,34 +15541,39 @@ next_upage(struct task_context *tc, ulong vaddr, ulong *nextvaddr)
char *vma_buf;
ulong vm_start, vm_end;
ulong vm_next;
+ ulong mm_mt, entry_num, i;
+ struct list_pair *entry_list;
if (!tc->mm_struct)
return FALSE;
- fill_mm_struct(tc->mm_struct);
- vma = ULONG(tt->mm_struct + OFFSET(mm_struct_mmap));
+ fill_mm_struct(tc->mm_struct);
+ vaddr = VIRTPAGEBASE(vaddr) + PAGESIZE(); /* first possible page */
total_vm = ULONG(tt->mm_struct + OFFSET(mm_struct_total_vm));
-
- if (!vma || (total_vm == 0))
+ if (!total_vm)
return FALSE;
- vaddr = VIRTPAGEBASE(vaddr) + PAGESIZE(); /* first possible page */
-
- for ( ; vma; vma = vm_next) {
- vma_buf = fill_vma_cache(vma);
-
- vm_start = ULONG(vma_buf + OFFSET(vm_area_struct_vm_start));
- vm_end = ULONG(vma_buf + OFFSET(vm_area_struct_vm_end));
- vm_next = ULONG(vma_buf + OFFSET(vm_area_struct_vm_next));
-
- if (vaddr <= vm_start) {
- *nextvaddr = vm_start;
- return TRUE;
+ if (INVALID_MEMBER(mm_struct_mmap) && VALID_MEMBER(mm_struct_mm_mt)) {
+ mm_mt = tc->mm_struct + OFFSET(mm_struct_mm_mt);
+ entry_num = do_maple_tree(mm_mt, MAPLE_TREE_COUNT, NULL);
+ entry_list = (struct list_pair *)GETBUF(entry_num * sizeof(struct list_pair));
+ do_maple_tree(mm_mt, MAPLE_TREE_GATHER, entry_list);
+ for (i = 0; i < entry_num; i++) {
+ if (!!(vma = (ulong)entry_list[i].value) &&
+ check_vma(vma, vaddr, NULL, nextvaddr)) {
+ FREEBUF(entry_list);
+ return TRUE;
+ }
}
+ FREEBUF(entry_list);
+ } else {
+ vma = ULONG(tt->mm_struct + OFFSET(mm_struct_mmap));
- if ((vaddr > vm_start) && (vaddr < vm_end)) {
- *nextvaddr = vaddr;
- return TRUE;
+ if (!vma)
+ return FALSE;
+ for ( ; vma; vma = vm_next) {
+ if (check_vma(vma, vaddr, &vm_next, nextvaddr))
+ return TRUE;
}
}
--
2.33.1
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