reverse next execution

reverse next execution

[John Smith]

hi,I am debugging a multiple threads using gdb .

when it come to be a segment fault or memory  collapse  ，I  want to
reverse-next  from the current $ip,but gdb tell me
"Target multi-thread does not support this command" , so I  don't know
how to deal wth this?

can you help me ?  I can set the programme running in a single thread
where the error occured .but how to use the reverse cammand in this
enviroment ?

thanks!

Re: reverse next execution

[Hui Zhu]

On Mon, Aug 6, 2012 at 9:17 AM, John Smith <juniorstuding@gmail.com> wrote:
> hi,I am debugging a multiple threads using gdb .
>
> when it come to be a segment fault or memory  collapse  ，I  want to
> reverse-next  from the current $ip,but gdb tell me
> "Target multi-thread does not support this command" , so I  don't know
> how to deal wth this?
>
> can you help me ?  I can set the programme running in a single thread
> where the error occured .but how to use the reverse cammand in this
> enviroment ?
>
> thanks!

I am not sure my patch about prec for multiple threads support is
checked in to GDB or not.  So ...

Thanks,
Hui

Re: reverse next execution

[John Smith]

hi,guys

       Is  there  some  modules   which can  get  kernel data for
gdb, as gdb working at user-mode .so can not get some kernel data

is there some patch can do this?


thanks!

Re: reverse next execution

[Jan Kratochvil]

Hello,

On Mon, 06 Aug 2012 10:25:27 +0200, John Smith wrote:
>        Is  there  some  modules   which can  get  kernel data for
> gdb, as gdb working at user-mode .so can not get some kernel data
> 
> is there some patch can do this?

(As I was in To) I do not understand the question.

One idea is if you want symbols from Linux kernel, look for file 'vmlinux'
(if it is built in kernel config with debug symbols).

GDB is userland process, it only uses system calls of Linux kernel (if you
mean Linux kernel).  GDB is in fact unrelated to kernels.


Regards,
Jan