site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I'll jump in this band wagon. I see this regularly. It is very frustrating to take 10-15 minutes to setup a two-machine debugging session only to have stepping shut down the entire session. Yes, I can verify that this happens regularly. On Nov 17, 2009, at 3:17 PM, Joe Lowe wrote:

The break/continue, advance, and stepi commands work fine. I would expect whatever technical difficulties there are with implementing source level single stepping would to some extent affect these other commands.

I guess maybe a better question: Can anyone confirm that they use ethernet kernel debugging with OSX and are able to single step hrough source without the debuggee sometimes locking up?

Joe

James Shimer wrote:

...

There are special hardware debugging tools used for debugging schedulers, In Circuit Emulation (ICE) and JTAG. With out them, I think your subject to catch 22 between debugger scheduling and your "step over" break point causing deadlock. On Nov 9, 2009, at 12:32 PM, Joe Lowe wrote:

...

I am using GDB kernel debugging over ethernet. Whenever I single step over a function call the target system locks up and never returns to the debugger. The keyboard debug break sequence and power button do not help once in this state. The target machine has to be power cycled.

Target system is a quad core intel based mac running OSX 10.5.8. The GDB version on the debugger system is "GNU gdb 6.3.50-20050815 (Apple version gdb-966) (Tue Mar 10 02:43:13 UTC 2009)", using the 10.5.8 kernel debug kit. The debugger is fully functional except for the single stepping issue.

Has anyone else seen this or have any idea what might be the cause?

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