On 3/19/07, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
BUG_ON(!PageSlab(page));
that's seriously screwed up. Do you have CONFIG_DEBUG_SLAB enabled? If
not, please enable it and retest.
This is scary. Looking at disassembly of the OOPS:
Disassembly of section .text:
00000000 <.text>:
0: 5f pop %edi
1: c3 ret
2: 57 push %edi
3: 89 c1 mov %eax,%ecx
5: 89 d7 mov %edx,%edi
7: 8d 92 00 00 00 40 lea 0x40000000(%edx),%edx
d: 56 push %esi
e: c1 ea 0c shr $0xc,%edx
11: 53 push %ebx
12: c1 e2 05 shl $0x5,%edx
15: 03 15 40 5d 5a c0 add 0xc05a5d40,%edx
At this point, edx has the result of virt_to_page().
1b: 8b 02 mov (%edx),%eax
1d: f6 c4 40 test $0x40,%ah
20: 74 03 je 0x25
If it's a compound page, look up the real page from ->private.
22: 8b 52 0c mov 0xc(%edx),%edx
Now, reload page flags.
25: 8b 02 mov (%edx),%eax
And test...
27: a8 80 test $0x80,%al
29: 75 04 jne 0x2f
2b: 0f 0b ud2a
2d: eb fe jmp 0x2d
2f: 39 4a 18 cmp %ecx,0x18(%edx)
[snip, snip]
EIP is at kmem_cache_free+0x29/0x5a
eax: c1800000 ebx: f0ae12c0 ecx: c18f73c0 edx: c1800000
esi: c1919de0 edi: 00000000 ebp: 00001000 esp: f1fe7e14
ds: 007b es: 007b ss: 0068
But somehow eax and edx have the same value 0xc1800000 here. Hmm?
Pekka
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