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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unable to resolve pending breakpoint to an indirect (STT_GNU_IFUNC) function"
href="https://bugs.llvm.org/show_bug.cgi?id=36394">36394</a>
</td>
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<tr>
<th>Summary</th>
<td>Unable to resolve pending breakpoint to an indirect (STT_GNU_IFUNC) function
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dantipov@nvidia.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=19868" name="attach_19868" title="Test program">attachment 19868</a> <a href="attachment.cgi?id=19868&action=edit" title="Test program">[details]</a></span>
Test program
While trying to setup a pending breakpoint for sin() and cos() which are
dlsym()ed from libm.so, an attempt to continue execution seems just hangs the
debugger:
(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
Note that sin() and cos() are not the regular functions but an indirect
function stubs, see <a href="https://sourceware.org/glibc/wiki/GNU_IFUNC">https://sourceware.org/glibc/wiki/GNU_IFUNC</a>.</pre>
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