[lldb-dev] Pending breakpoints to dlsym()ed functions

Dmitry Antipov via lldb-dev lldb-dev at lists.llvm.org
Wed Feb 14 23:39:34 PST 2018

I'm trying to setup a pending breakpoint for sin() and cos() which are dlsym()ed from libm.so
(sample attached), and an attempt to continue execution seems just hangs the debugger. For example:

(lldb) attach 17043
Process 17043 stopped
* thread #1, name = 't-dlopen', stop reason = signal SIGSTOP
     frame #0: 0x0000000000400728 t-dlopen`main(argc=1, argv=0x00007ffd2b0a00c8) at t-dlopen.c:21
    18  	  for (a = 0; a < DELAY + argc; a++)
    19  	    for (b = 0; b < DELAY + argc; b++)
    20  	      for (c = 0; c < DELAY + argc; c++)
-> 21  	        z += a + b + c;
    22  	  while (1)
    23  	    {
    24  	      void *handle = dlopen (LIBM_SO, RTLD_LAZY);

Executable module set to "/home/dantipov/tmp/t-dlopen".
Architecture set to: x86_64--linux.
(lldb) breakpoint set -n sin
Breakpoint 1: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.
(lldb) breakpoint set -n cos
Breakpoint 2: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.
(lldb) process continue                              ;; After this, nothing happens for a long time
Process 17043 resuming
(lldb) process status                                ;; After this, lldb hangs and have to be killed

I've tried 6.0.0-rc2 as well as 7.0.0 svn trunk 325127, with the same disappointing results.


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