https://bugs.llvm.org/show_bug.cgi?id=36394
Bug ID: 36394
Summary: Unable to resolve pending breakpoint to an indirect
(STT_GNU_IFUNC) function
Product: lldb
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: danti...@nvidia.com
CC: llvm-b...@lists.llvm.org
Created attachment 19868
--> https://bugs.llvm.org/attachment.cgi?id=19868&action=edit
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 https://sourceware.org/glibc/wiki/GNU_IFUNC.
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