gdb on 2.2/2.4

gdb on 2.2/2.4

[Filipau, Ihar]

Hello!

  [ CC me please - I'm not subscribed ]

  Couple of issues. I hope RH8 kernels not much /patched/ 
  comparing to vanilla in this respect.

  1. gdb doesn't work on 2.4 - if app got SIGSEGV - I cannot see
     backtrace of random thread. I have mutli-threaded app - but 
     gdb cannot access any other thread - only main thread.

  2. on 2.4 + ptrace() security fix, gdb on signal prints error 
     message: "Couldn't access registers: permission denied".
     and sure only 'quit' works correctly after this.

  In both cases it is run from user account.

  Does any-one has any clue how to make gdb working on rh8?
  I have tried to use vanilla kernel - but have no succes to 
  date...

  I'm not much about debugging - but finding a 
  SIGSEGV/SIGILL source is much more faster with gdb.

P.S. System: SMP/PIII (Tried in both smp/nosmp), RH8 std kernel, 
     RH8 updated kernel, 2.4.20. gcc 3.2/3.2.2, gdb 5.3.

--- Regards&Wishes! With respect  Ihar "Philips" Filipau, and Phil for
friends

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MCS/Mathematician - System Programmer
Ihar Filipau 
Software entwickler @ SUSS MicroTec Test Systems GmbH, 
Suss-Strasse 1, D-01561 Sacka (bei Dresden)
e-mail: ifilipau@sussdd.de  tel: +49-(0)-352-4073-327
fax: +49-(0)-352-4073-700   web: http://www.suss.com/