Re: git-slub crashes on the t16p

[Pekka Enberg <penberg@cs.helsinki.fi>]

Hi Andrew,

Pekka J Enberg wrote:
>> It's the tree I pulled about 12 hours ago.  Quite early in boot.
>>
>> crash: http://userweb.kernel.org/~akpm/p4105087.jpg
>> config: http://userweb.kernel.org/~akpm/config-t61p.txt
>> git-slub.patch: http://userweb.kernel.org/~akpm/mmotm/broken-out/git-slub.patch
>>
>> A t61p is a dual-core x86_64.
>>
>> I was testing with all of the -mm series up to and including git-slub.patch
>> applied.

On Thu, 10 Apr 2008, Andrew Morton wrote:
> Does the following patch fix it?

Okay, forget the patch. Looking at disassembly of the oops:

0000000000000000 <.text>:
    0:   eb ce                   jmp    0xffffffffffffffd0
    2:   48 89 de                mov    %rbx,%rsi
    5:   4c 89 e7                mov    %r12,%rdi
    8:   e8 38 fe ff ff          callq  0xfffffffffffffe45
    d:   b8 01 00 00 00          mov    $0x1,%eax
   12:   5b                      pop    %rbx
   13:   41 5c                   pop    %r12
   15:   c9                      leaveq
   16:   c3                      retq
   17:   c3                      retq
   18:   48 63 f6                movslq %esi,%rsi
   1b:   55                      push   %rbp
   1c:   48 8b 8c f7 20 01 00    mov    0x120(%rdi,%rsi,8),%rcx
   23:   00
   24:   48 89 e5                mov    %rsp,%rbp
   27:   48 85 c9                test   %rcx,%rcx
   2a:   74 0d                   je     0x39
   2c:   f0 48 ff 41 50          lock incq 0x50(%rcx) # %rcx == 0x64
   31:   48 63 c2                movslq %edx,%rax
   34:   f0 48 01 41 58          lock add %rax,0x58(%rcx)
   39:   c9                      leaveq
   3a:   c3                      retq
   3b:   48 8b 07                mov    (%rdi),%rax
   3e:   55                      push   %rbp
   3f:   48                      rex.W
   40:   89                      .byte 0x89

Somehow s->node[node] gets to be 0x64 which makes no sense. I checked my 
logs and I hit the exact same problem but it went away with "make 
clean". Andrew, can you please try that as well?

			Pekka

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