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

Matthew Gardiner mg11 at csr.com
Mon Feb 10 03:51:29 PST 2014

Xavier de Gaye wrote:
> On 02/10/2014 11:00 AM, Matthew Gardiner wrote:
> > Hi,
> >
> > 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 GNU/Linux
> >
> > 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 seems related to http://llvm.org/bugs/show_bug.cgi?id=17802
> in that lldb aborts at the same assertion.
> Xavier
Thanks Xavier,

My next line of enquiry (I think) is to determine why my lldb thinks a 

LinuxThread::TraceNotify(const ProcessMessage &message)
     POSIXBreakpointProtocol* reg_ctx = GetPOSIXBreakpointProtocol();
     if (reg_ctx)
         uint32_t num_hw_wps = reg_ctx->NumSupportedHardwareWatchpoints();
         uint32_t wp_idx;
         for (wp_idx = 0; wp_idx < num_hw_wps; wp_idx++)
             if (reg_ctx->IsWatchpointHit(wp_idx))
                 fprintf(stderr, "MG!! LinuxThread::TraceNotify\n");

has been hit.

What does LLDB's concept of a Watchpoint mean? Is it like Visual 
Studio's watched variable?


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