Re: maxima: debugging unaligned access
Greetings, and thanks!
Breakpoint 2 at 0x200000000051de70
(gdb) r -eval '(run)'
Starting program: /home/camm/maxima-5.20.1/src/binary-gcl/maxima -eval '(run)'
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x200000000051de70: Input/output error.
(gdb)
???
Take care,
Zan Lynx <zlynx@acm.org> writes:
> On 1/26/10 3:29 PM, Camm Maguire wrote:
>> Greetings, ad thanks for your helpful suggestions. Having a bit of
>> trouble.
>>
>> All this is in merulo chroot sid with gcc 4.4 at -O2.
>>
>> Outside gdb:
>>
>> 133/133 tests passed.
>> Running tests in rtest8: maxima(18072): unaligned access to 0x600000000412c8b8, ip=0x200000000051de70
>> Bus error
>>
>> Inside gdb, the program does not stop at this point with a bus error,
>> but dies later due to memory corruption.
>>
>> 1) Can I instruct gdb to stop at any such unaligned access?
>>
>> I guessed:
>>
>> (gdb) b *0x600000000412c8b8
>> Can't insert breakpoint for slot numbers greater than 2.
>>
>> (gdb) b *0x600000000412c8b1
>> Breakpoint 3 at 0x600000000412c8b1
>>
>> then reran, but gdb fell over:
>
> The 0x6... addr is the data. You cannot execute data so you cannot
> breakpoint there (you could set a watchpoint though).
>
> Use the 0x200000000051de70 addr instead.
>
> --
> Zan Lynx
> zlynx@acm.org
>
> "Knowledge is Power. Power Corrupts. Study Hard. Be Evil."
>
>
>
--
Camm Maguire camm@maguirefamily.org
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