Hello Dave,
When issuing "kmem -s" with crash 6.0.2 (same with 6.0.0) on a s390x
linux-3.2 kernel dump, I get the following:
...
1ff0a600 signal_cache 1104 112 150 6 32k
1ff0a540 sighand_cache 2088 82 98 7 32k
kmem: invalid structure member offset: page_lru
FILE: memory.c LINE: 15856 FUNCTION: count_partial()
[./crash] error trace: 80099674 => 80097156 => 80083c40 => 801206ba
801206ba: OFFSET_verify+138
80083c40: get_kmem_cache_slub_data+1028
80097156: dump_kmem_cache_slub+902
80099674: cmd_kmem+6636
kmem: invalid structure member offset: page_lru
FILE: memory.c LINE: 15856 FUNCTION: count_partial()
I think the reason is that MEMBER_OFFSET_INIT(page_lru, "page", "lru") fails.
See the following gdb session:
Breakpoint 1, vm_init () at memory.c:375
375 MEMBER_OFFSET_INIT(page_lru, "page", "lru");
(gdb) s
datatype_info (name=0x80415c4a "page", member=0x803ce36c "lru", dm=0x0)
at symbols.c:4919
4919 if (dm == ANON_MEMBER_OFFSET_REQUEST)
(gdb) n
4922 strcpy(buf, name);
(gdb) n
4924 req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
(gdb) n
4925 req->command = GNU_GET_DATATYPE;
(gdb) n
4926 req->flags |= GNU_RETURN_ON_ERROR;
(gdb) n
4927 req->name = buf;
(gdb) n
4928 req->member = member;
(gdb) n
4929 req->fp = pc->nullfp;
(gdb) n
4931 gdb_interface(req);
(gdb) n
4932 if (req->flags & GNU_COMMAND_FAILED) {
(gdb) print *req
$1 = {command = 5, buf = 0x0, fp = 0x8060d540, addr = 0, addr2 = 0, count = 0,
flags = 8, name = 0x3ffffffda94 "page", length = 56, typecode = 3,
typename = 0x0, target_typename = 0x0, target_length = 0,
target_typecode = 0, is_typedef = 0, member = 0x803ce36c "lru",
member_offset = -1, member_length = 0, member_typecode = 0, value = 0,
tagname = 0x0, pc = 0, sp = 0, ra = 0, curframe = 0, frame = 0, prevsp = 0,
prevpc = 0, lastsp = 0, task = 0, debug = 0, hookp = 0x0}
---> member_offset = -1
(gdb) n
4937 if (!req->typecode) {
(gdb) n
4942 if (!req->typecode) {
(gdb) n
4947 member_typecode = TYPE_CODE_UNDEF;
(gdb) n
4948 member_size = 0;
(gdb) n
4949 type_found = 0;
(gdb) n
4951 if (CRASHDEBUG(2)) {
(gdb) n
4965 switch (req->typecode)
(gdb) n
4968 type_found = STRUCT_REQUEST;
(gdb) n
4969 size = req->length;
(gdb) n
4970 if (req->member_offset >= 0) {
(gdb) n
4975 offset = -1;
(gdb) n
4976 member_size = 0;
Also crash can't evaluate the offset of the "lru" member:
crash> struct page
struct page {
long unsigned int flags;
struct address_space *mapping;
struct {
union {...};
union {...};
};
union {
struct list_head lru;
struct {...};
};
union {
long unsigned int private;
spinlock_t ptl;
struct kmem_cache *slab;
struct page *first_page;
};
}
SIZE: 56
crash> struct page.mapping
struct page {
[8] struct address_space *mapping;
}
crash> struct page.lru
struct: invalid data structure reference: page.lru
Any idea why we do not get the offset from gdb?
Perhaps a problem with the anonymous union?
Michael
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