On Mon, 2006-07-10 at 11:42 +0300, Pekka Enberg wrote:
> On 7/10/06, Mike Galbraith <[email protected]> wrote:
> > While trying to figure out what happened to break suspend to disk on my
> > box, and booting between various other kernels to compare messages, I
> > accidentally captured the following during shutdown. I have no idea if
> > failed suspends have anything to do with it, but it may, because I
> > haven't had this happen in any other circumstance. I'm making a rash
> > presumption that the two or three other times the box has died on
> > shutdown (without serial console being connected) were the same.
>
> [snip]
>
> > kernel BUG at <bad filename>:45803! <-- what goeth on here. it's slab.c:1542
>
> Looks as if kernel text is messed up.
>
> > Code: 30 8b 57 3c 8b 45 f0 e8 d5 ac fe ff f6 47 36 02 74 11 8b 4f 3c b8 01 00 00 00 d3 e0 f0 29 05 14 ad 5f b1 83 c4 04 5b 5e 5f 5d c3 <0f> 0b eb b2 55 89 e5 57 56 53 83 ec 28 89 c6 89 d3 89 e0 25 00
>
> See how ud2a comes after ret which doesn't match what GCC generates
> for me at least. Furthermore, the BUG() line number is messed up (eb
> b2). So doesn't look like a slab bug to me.
Hm. I've never _noticed_ gcc putting anything out there before. This
is gcc version 4.1.2 20060531 (prerelease) (SUSE Linux).
000002ee <kmem_freepages>:
2ee: 55 push %ebp
2ef: 89 e5 mov %esp,%ebp
2f1: 57 push %edi
2f2: 56 push %esi
2f3: 53 push %ebx
2f4: 83 ec 04 sub $0x4,%esp
2f7: 89 c7 mov %eax,%edi
2f9: 89 55 f0 mov %edx,0xfffffff0(%ebp)
2fc: 8b 48 3c mov 0x3c(%eax),%ecx
2ff: be 01 00 00 00 mov $0x1,%esi
304: d3 e6 shl %cl,%esi
306: 89 d3 mov %edx,%ebx
308: 81 c3 00 00 00 50 add $0x50000000,%ebx
30e: c1 eb 0c shr $0xc,%ebx
311: c1 e3 05 shl $0x5,%ebx
314: 03 1d 00 00 00 00 add 0x0,%ebx
31a: 8b 03 mov (%ebx),%eax
31c: 89 f1 mov %esi,%ecx
31e: f7 d9 neg %ecx
320: c1 e8 1e shr $0x1e,%eax
323: 8b 04 85 00 00 00 00 mov 0x0(,%eax,4),%eax
32a: ba 03 00 00 00 mov $0x3,%edx
32f: e8 fc ff ff ff call 330 <kmem_freepages+0x42>
334: 85 f6 test %esi,%esi
336: 74 18 je 350 <kmem_freepages+0x62>
338: 31 d2 xor %edx,%edx
33a: eb 03 jmp 33f <kmem_freepages+0x51>
33c: 83 c3 20 add $0x20,%ebx
33f: 8b 03 mov (%ebx),%eax
341: 84 c0 test %al,%al
343: 79 4a jns 38f <kmem_freepages+0xa1> <===
345: 0f ba 33 07 btrl $0x7,(%ebx)
349: 83 c2 01 add $0x1,%edx
34c: 39 d6 cmp %edx,%esi
34e: 75 ec jne 33c <kmem_freepages+0x4e>
350: 89 e0 mov %esp,%eax
352: 25 00 f0 ff ff and $0xfffff000,%eax
357: 8b 00 mov (%eax),%eax
359: 8b 80 dc 04 00 00 mov 0x4dc(%eax),%eax
35f: 85 c0 test %eax,%eax
361: 74 02 je 365 <kmem_freepages+0x77>
363: 01 30 add %esi,(%eax)
365: 8b 57 3c mov 0x3c(%edi),%edx
368: 8b 45 f0 mov 0xfffffff0(%ebp),%eax
36b: e8 fc ff ff ff call 36c <kmem_freepages+0x7e>
370: f6 47 36 02 testb $0x2,0x36(%edi)
374: 74 11 je 387 <kmem_freepages+0x99>
376: 8b 4f 3c mov 0x3c(%edi),%ecx
379: b8 01 00 00 00 mov $0x1,%eax
37e: d3 e0 shl %cl,%eax
380: f0 29 05 00 00 00 00 lock sub %eax,0x0
387: 83 c4 04 add $0x4,%esp
38a: 5b pop %ebx
38b: 5e pop %esi
38c: 5f pop %edi
38d: 5d pop %ebp
38e: c3 ret
38f: 0f 0b ud2a
391: eb b2 jmp 345 <kmem_freepages+0x57>
00000393 <__cache_free>:
-
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