"thread apply all bt full" gives blank in GDB

linux multithreading debugging gdb slackware
ϹοδεMεδιϲ picture ϹοδεMεδιϲ · Jan 21, 2010 · Viewed 20.2k times · Source

I was trying to debug a multi-threaded process on a Linux server running Slackware 12 using GDB 6.6.

Once I attach and issue the command "thread apply all bt full" it comes back with nothing ( back on to the gdb prompt ).

Any idea why this happens?

Answer

Michael picture Michael · Sep 13, 2011

I ran into this problem and discovered that I can fix it as follows:

  1. run "bt". this should show the backtrace of a thread, although maybe not the one you want.
  2. now "cont".
  3. hit ctrl+c. I see something like "[Switching to LWP %d]"
  4. hit ctrl+c again. this breaks at the thread i want to see the backtrace of, but also seems to make "thread apply all bt full" start working.

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