gdb suspends itself

gdb suspends itself

[Klaus Zeitler]

Hello,
I'm trying to debug a program with approx. 100 threads under Solaris 5.8,
that generates lots of trace data. When I run the program under gdb,
the first few threads are started, then gdb suspends itself and I need to
call 'fg' to resume execution, i.e. the whole thing looks like e.g.:

[674]$ gdb ./umc.vx 
GNU gdb 6.3.0.20050704-cvs
...
[New LWP 27]
UMC1-1-> [07-05 10:05:41:932930] (tMain      ) : Smdev: SMDEV initialization succeeded!
[New LWP 28]
logMsg [07-05 10:05:42:849879] (FireWire   ) : PetDemon create Server socket on port 45263
UMC1-1-> [07-05 10:05:42:870024] 0x13dd7d0  (tFtpdTask  ) : waiting for a new client connection...
UMC1-1-> [07-05 10:05:42:981463] 0x7277b0   (tMain      ) : Initializing OSipc

[6]+  Stopped                 gdb ./umc.vx
[675]$ fg
gdb ./umc.vx
---Type <return> to continue, or q <return> to quit---
[New LWP 29]
logMsg [07-05 10:20:36:924936] (nbapDemon  ) : PetDemon create Server socket on port 45260
...

The same happens with gdb 5.3. and 6.1.
This is probably not a gdb problem, but I hope someone can give me a hint
how I should investigate this odd behavior.

Thanks

Klaus

-- 
 ------------------------------------------
|  Klaus Zeitler      Lucent Technologies  |
|  Email:             kzeitler@lucent.com  |
 ------------------------------------------
---
There are very few personal problems that cannot be solved
through a suitable application of high explosives.

Re: gdb suspends itself

[Vladimir Prus]

Klaus Zeitler wrote:

> 
> Hello,
> I'm trying to debug a program with approx. 100 threads under Solaris 5.8,
> that generates lots of trace data. When I run the program under gdb,
> the first few threads are started, then gdb suspends itself and I need to
> call 'fg' to resume execution, i.e. the whole thing looks like e.g.:
......
> UMC1-1-> [07-05 10:05:42:981463] 0x7277b0   (tMain      ) : Initializing
> OSipc
> 
> [6]+  Stopped                 gdb ./umc.vx
> [675]$ fg
> gdb ./umc.vx
> ---Type <return> to continue, or q <return> to quit---
> [New LWP 29]
> logMsg [07-05 10:20:36:924936] (nbapDemon  ) : PetDemon create Server
> socket on port 45260 ...
> 
> The same happens with gdb 5.3. and 6.1.
> This is probably not a gdb problem, but I hope someone can give me a hint
> how I should investigate this odd behavior.

Try

   stty -tostop

before running gdb. I had such problems because gdb sometimes tries to
output messages while not "owning" terminal. The above command tells the
terminal to not stop programs in such cases.

- Volodya

Re: gdb suspends itself

[Klaus Zeitler]

>>>>> "Vladimir" == Vladimir Prus <ghost@cs.msu.su> writes:
    Vladimir> 
    Vladimir> Try
    Vladimir> 
    Vladimir>    stty -tostop
    Vladimir> 
    Vladimir> before running gdb. I had such problems because gdb sometimes
    Vladimir> tries to output messages while not "owning" terminal. The above
    Vladimir> command tells the terminal to not stop programs in such cases.

this didn't help, the same thing happens.

Klaus



-- 
 ------------------------------------------
|  Klaus Zeitler      Lucent Technologies  |
|  Email:             kzeitler@lucent.com  |
 ------------------------------------------
---
Linux, because a cpu is a terrible thing to waste