* what is the function of EXCEPTIONS_SIGLONGJMP?
@ 2012-09-13 9:55 John Smith
2012-09-15 6:08 ` Jan Kratochvil
0 siblings, 1 reply; 4+ messages in thread
From: John Smith @ 2012-09-13 9:55 UTC (permalink / raw)
To: gdb
hi:
when I debug gdb using gdb self , after I type "start" command ,
the prompt is as below :
Warning:
Cannot insert breakpoint 0.
Error accessing memory address 0xdb6a5194: /.
0xb7589571 in siglongjmp () from /lib/i686/cmov/libc.so.6
it seem to be some exceptions happened when dealing with break points .
and Is there some interpret here ?
thanks!
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: what is the function of EXCEPTIONS_SIGLONGJMP?
2012-09-13 9:55 what is the function of EXCEPTIONS_SIGLONGJMP? John Smith
@ 2012-09-15 6:08 ` Jan Kratochvil
2012-09-16 6:50 ` John Smith
0 siblings, 1 reply; 4+ messages in thread
From: Jan Kratochvil @ 2012-09-15 6:08 UTC (permalink / raw)
To: John Smith; +Cc: gdb
On Thu, 13 Sep 2012 11:55:34 +0200, John Smith wrote:
> when I debug gdb using gdb self , after I type "start" command ,
> the prompt is as below :
> Warning:
> Cannot insert breakpoint 0.
> Error accessing memory address 0xdb6a5194: /.
> 0xb7589571 in siglongjmp () from /lib/i686/cmov/libc.so.6
>
> it seem to be some exceptions happened when dealing with break points .
You are trying to step over longjmp or siglongjmp call. This is supported
only with SystemTap-extended glibc, this is implemented only in recent glibc
and recent GDB. Recent Fedora releases also have it working.
glibc/
commit 8422c9a560e6e3c854739c8a13ecb1c6714f930f
Author: Roland McGrath <roland@hack.frob.com>
Date: Fri May 25 13:31:57 2012 -0700
Add systemtap static probe points in setjmp/longjmp on x86.
gdb/
commit 014135139c612fe1fbe6f11d2350f72325a66f7c
Author: sergiodj <sergiodj>
Date: Fri Apr 27 20:48:52 2012 +0000
2012-04-27 Sergio Durigan Junior <sergiodj@redhat.com>
Tom Tromey <tromey@redhat.com>
I just do not understand how that can happen during 'start' command, 'start'
is just doing 'tbreak' and 'run', there is no stepping involved anywhere.
Regards,
Jan
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: what is the function of EXCEPTIONS_SIGLONGJMP?
2012-09-15 6:08 ` Jan Kratochvil
@ 2012-09-16 6:50 ` John Smith
2012-09-16 7:15 ` Jan Kratochvil
0 siblings, 1 reply; 4+ messages in thread
From: John Smith @ 2012-09-16 6:50 UTC (permalink / raw)
To: gdb
I am not trying to step over longjump, I just trace the event loop
> procedure of gdb
> so why does that exception occured?
2012/9/15 Jan Kratochvil <jan.kratochvil@redhat.com>:
> On Thu, 13 Sep 2012 11:55:34 +0200, John Smith wrote:
>> when I debug gdb using gdb self , after I type "start" command ,
>> the prompt is as below :
>> Warning:
>> Cannot insert breakpoint 0.
>> Error accessing memory address 0xdb6a5194: /.
>> 0xb7589571 in siglongjmp () from /lib/i686/cmov/libc.so.6
>>
>> it seem to be some exceptions happened when dealing with break points .
>
> You are trying to step over longjmp or siglongjmp call. This is supported
> only with SystemTap-extended glibc, this is implemented only in recent glibc
> and recent GDB. Recent Fedora releases also have it working.
> glibc/
> commit 8422c9a560e6e3c854739c8a13ecb1c6714f930f
> Author: Roland McGrath <roland@hack.frob.com>
> Date: Fri May 25 13:31:57 2012 -0700
> Add systemtap static probe points in setjmp/longjmp on x86.
> gdb/
> commit 014135139c612fe1fbe6f11d2350f72325a66f7c
> Author: sergiodj <sergiodj>
> Date: Fri Apr 27 20:48:52 2012 +0000
> 2012-04-27 Sergio Durigan Junior <sergiodj@redhat.com>
> Tom Tromey <tromey@redhat.com>
>
> I just do not understand how that can happen during 'start' command, 'start'
> is just doing 'tbreak' and 'run', there is no stepping involved anywhere.
>
>
> Regards,
> Jan
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: what is the function of EXCEPTIONS_SIGLONGJMP?
2012-09-16 6:50 ` John Smith
@ 2012-09-16 7:15 ` Jan Kratochvil
0 siblings, 0 replies; 4+ messages in thread
From: Jan Kratochvil @ 2012-09-16 7:15 UTC (permalink / raw)
To: John Smith; +Cc: gdb
On Sun, 16 Sep 2012 08:50:08 +0200, John Smith wrote:
> I am not trying to step over longjump, I just trace the event loop
> > procedure of gdb
> > so why does that exception occured?
"trace the event loop" is too ambiguous, you should copy-paste your session.
Various features of GDB enable stepping mode which will then fail with old
system components like you described.
Regards,
Jan
^ permalink raw reply [flat|nested] 4+ messages in thread
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2012-09-13 9:55 what is the function of EXCEPTIONS_SIGLONGJMP? John Smith
2012-09-15 6:08 ` Jan Kratochvil
2012-09-16 6:50 ` John Smith
2012-09-16 7:15 ` Jan Kratochvil
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