gdb suspends itself

[Klaus Zeitler <kzeitler at lucent dot com>]

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.