[uml-devel] SIGTRAP and gdb multithreading program under UML

[uml-devel] SIGTRAP and gdb multithreading program under UML

[Miao Qingjun]

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Hi,

Under UML bash, I gdb a multithreading program, and set a breakpoint on thread entry function,
But when run it, gdb is not stop at the breakpoint, 
instead, program exit because:

Program terminated with signal SIGTRAP, Trace/breakpoint trap.

Why?

Thanks.

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Re: [uml-devel] SIGTRAP and gdb multithreading program under UML

[Blaisorblade]

On Thursday 13 July 2006 14:49, Miao Qingjun wrote:
> Hi,
>
> Under UML bash, I gdb a multithreading program, and set a breakpoint on
> thread entry function, But when run it, gdb is not stop at the breakpoint,
> instead, program exit because:
>
> Program terminated with signal SIGTRAP, Trace/breakpoint trap.
I don't know, but:
Is that different under host / UML? If yes /lib/tls may play a role (but it is 
used on host, and it should be used in UML).

-- 
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Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
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Re: [uml-devel] SIGTRAP and gdb multithreading program under UML

[Jeff Dike]

On Thu, Jul 13, 2006 at 08:49:31PM +0800, Miao Qingjun wrote:
> Under UML bash, I gdb a multithreading program, and set a breakpoint on thread entry function,
> But when run it, gdb is not stop at the breakpoint, 
> instead, program exit because:
> 
> Program terminated with signal SIGTRAP, Trace/breakpoint trap.

What version of UML?  Sounds like a bug in UML interrupt handling.

Can you send me a copy of the binary you're debugging?

				Jeff


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Re: [uml-devel] SIGTRAP and gdb multithreading program under UML

[Blaisorblade]

On Thursday 13 July 2006 20:45, Jeff Dike wrote:
> On Thu, Jul 13, 2006 at 08:49:31PM +0800, Miao Qingjun wrote:
> > Under UML bash, I gdb a multithreading program, and set a breakpoint on
> > thread entry function, But when run it, gdb is not stop at the
> > breakpoint,
> > instead, program exit because:
> >
> > Program terminated with signal SIGTRAP, Trace/breakpoint trap.
>
> What version of UML?  Sounds like a bug in UML interrupt handling.
>
> Can you send me a copy of the binary you're debugging?
SIGTRAP must be sent for the breakpoint - I think the problem is that either 
GDB misinterprets it or it is not sent the correct way.

-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
 http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com 



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Re: [uml-devel] SIGTRAP and gdb multithreading program under UML

[Jeff Dike]

On Thu, Jul 13, 2006 at 08:50:29PM +0200, Blaisorblade wrote:
> SIGTRAP must be sent for the breakpoint - I think the problem is that either 
> GDB misinterprets it or it is not sent the correct way.

I'm thinking the latter...

			Jeff


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