[lldb-dev] 'breakpoint delete' vs. 'breakpoint disable'

[Greg Clayton via lldb-dev]

Breakpoint disable will keep the breakpoint around and all of its locations. Breakpoint delete will delete it. Shouldn't make a difference and one doesn't have to happen before the other. Sounds like you found a bug. When things crash it would be good to attach a stack backtrace of why LLDB is crashing. That will help us to see what us causing the issue.

Greg Clayton


> On Feb 16, 2018, at 6:13 AM, Dmitry Antipov via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> 
> While operating on a breakpoints, is it correct to use 'breakpoint delete' without
> previous 'breakpoint disable'? With this scenario, I'm observing 6.0.0-rc2 crash with:
> 
> $ /home/dantipov/.local/llvm-6.0.0/bin/lldb t-thread2
> (lldb) target create "t-thread2"
> Current executable set to 't-thread2' (x86_64).
> (lldb) breakpoint set -n g
> Breakpoint 1: where = t-thread2`g(int) + 7 at t-thread2.cc:9, address = 0x0000000000400d0e
> (lldb) run
> Process 19195 launched: '/home/dantipov/tmp/t-thread2' (x86_64)
> Process 19195 stopped
> * thread #2, name = 't-thread2', stop reason = breakpoint 1.1
>    frame #0: 0x0000000000400d0e t-thread2`g(v=0) at t-thread2.cc:9
>   6   	g (int v)
>   7   	{
>   8   	  (void) v;
> -> 9   	}
>   10  	
>   11  	void
>   12  	f (int v)
> (lldb) process continue
> Process 19195 resuming
> Process 19195 stopped
> * thread #3, name = 't-thread2', stop reason = breakpoint 1.1
>    frame #0: 0x0000000000400d0e t-thread2`g(v=1) at t-thread2.cc:9
>   6   	g (int v)
>   7   	{
>   8   	  (void) v;
> -> 9   	}
>   10  	
>   11  	void
>   12  	f (int v)
> (lldb) process continue
> Process 19195 resuming
> Process 19195 stopped
> * thread #2, name = 't-thread2', stop reason = breakpoint 1.1
>    frame #0: 0x0000000000400d0e t-thread2`g(v=0) at t-thread2.cc:9
>   6   	g (int v)
>   7   	{
>   8   	  (void) v;
> -> 9   	}
>   10  	
>   11  	void
>   12  	f (int v)
> (lldb) breakpoint delete
> About to delete all breakpoints, do you want to do that?: [Y/n] Y
> All breakpoints removed. (1 breakpoint)
> (lldb) process continue
> Process 19195 resuming
> Segmentation fault (core dumped)
> 
> There is no crash if 'breakpoint disable' was issued before 'breakpoint delete'.
> Sample program attached.
> 
> Dmitry
> 
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