[lldb-dev] API got SIGCHLD on hitting the breakpoint

[Vince Harron]

Hi Ziming,

The first thing you want to do is build and install the latest LLDB from
llvm.org.  If it is still a problem, please file a bug (with trivial repro
steps if possible).

Vince
 On Dec 18, 2014 6:01 PM, "Ziming Song" <s.ziming at hotmail.com> wrote:

> Hello, everyone
>
> I am using LLDB API to implement a gui debugger, but if I set a breakpoint
> using the following code:
>
> // variable i is the line number to set breakpoint at.
> SBBreakpoint b =
> m_target.BreakpointCreateByLocation(m_target.GetExecutable().GetFilename(),
> i);
> qDebug("Created Breakpoint %s At Line %d.",
> qPrintable(QString::number(b.GetNumLocations()).toLocal8Bit()), i);
>
> When I launch the program using m_target.LaunchSimple(NULL, NULL, "/") and
> when the target hit the breakpoint, the gui debugger crashes and exits. If
> I start the gui debugger using lldb I can see the following output:
>
> (lldb) r
> Process 14932 launched:
> '/home/szm/Documents/workSpace/qt/build-studio2-LLVM_qt5-Debug/studio2'
> (x86_64)
> Process 14932 stopped and restarted: thread 1 received signal: SIGCHLD
> Created Breakpoint 0 At Line 7.   <-- this is my program's output.
> Process 14932 stopped and restarted: thread 9 received signal: SIGCHLD
> Process 14932 stopped
> * thread #9: tid = 14953, 0x00007f1c5d5fa102
> liblldb.so`ProcessMonitor::ServeOperation(ProcessMonitor::OperationArgs*) +
> 50, name = 'operation', stop reason = invalid address (fault address: 0x11)
>     frame #0: 0x00007f1c5d5fa102
> liblldb.so`ProcessMonitor::ServeOperation(ProcessMonitor::OperationArgs*) +
> 50
> liblldb.so`ProcessMonitor::ServeOperation(ProcessMonitor::OperationArgs*)
> + 50:
> -> 0x7f1c5d5fa102:  callq  *0x10(%rdx)
>    0x7f1c5d5fa105:  movq   %rbp, %rdi
>    0x7f1c5d5fa108:  callq  0x7f1c5c8c1a80            ; symbol stub for:
> sem_post
>    0x7f1c5d5fa10d:  jmp    0x7f1c5d5fa0f0            ;
> ProcessMonitor::ServeOperation(ProcessMonitor::OperationArgs*) + 32
> (lldb)
>
> Seems that the program got SIGCHLD because the "invalid address", but I
> have no idea how to fix it. (I'm using ubuntu 14.04 with lldb-3.4-dev
> from apt-get.)
>
> Thanks,
> Song Ziming
>
>
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>
>
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