[lldb-dev] Linux lldb running a process produces WatchPoint assertion

Matthew Gardiner mg11 at csr.com
Mon Feb 10 02:00:35 PST 2014


I've checked out the head of trunk of llvm/clang/lldb and managed to 
build lldb for:

3.12.8-300.fc20.i686 #1 SMP Thu Jan 16 01:28:49 UTC 2014 i686 i686 i386 

using gcc-4.8.2. (I could only build a release version). When I attempt 
to debug a simple hello world program, the act of running the inferior 
results in a failed assertion in POSIXThread::WatchNotify(const 
ProcessMessage &message).

This is my output with some added printf:

 > lldb hello
Current executable set to 'hello' (i386).
(lldb) run
Process 4775 launching
MG!! LinuxThread::TraceNotify
void POSIXThread::WatchNotify(const ProcessMessage&): Assertion 
`wp_sp.get() && "No watchpoint found"' failed.
Aborted (core dumped)

I'm curious:
1. Does my crash happen because the path of execution should not flow 
through POSIXThread::WatchNotify at this time?
2. Does my crash happen because the assert statement itself is not 
correct (i.e. it should be an if(wp_sp.get()))

Thank you
Matthew Gardiner

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