https://llvm.org/bugs/show_bug.cgi?id=31212
Bug ID: 31212
Summary: LLDB steps incorrectly for binaries compiled using GCC
6.2 on Ubuntu 16.10
Product: lldb
Version: 3.9
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: eldar.abusali...@jetbrains.com
CC: llvm-b...@lists.llvm.org
Classification: Unclassified
Step-over and step-in skip source lines and behave more like step-out for code
compiled on Ubuntu 16.10 using GCC 6.2, which by default compiles with -pie.
Everything works correctly when using -fno-pie explicitly. The weird thing is,
everything also works fine when compiling on Ubuntu 16.04 using GCC 6.2 from
ppa:ubuntu-toolchain-r/test.
The issue is also reproducible with binaries compiled on Ubuntu 16.10 using GCC
6.2 which are then debugged on another system, like Ubuntu 16.04.
Source code:
#include <iostream>
void printHello() {
std::cout << "Hello, World! from function" << std::endl;
std::cout << "Hello, World! from function" << std::endl;
std::cout << "Hello, World! from function" << std::endl;
}
int main() {
printHello();
std::cout << "Hello, World! from main()" << std::endl;
std::cout << "Hello, World! from main()" << std::endl;
std::cout << "Hello, World! from main()" << std::endl;
return 0;
}
Debug session:
$ lldb ClionProjects/bug_test/cmake-build-debug/bug_test
Traceback (most recent call last):
File "<string>", line 1, in <module>
ImportError: No module named lldb.embedded_interpreter
(lldb) target create "ClionProjects/bug_test/cmake-build-debug/bug_test"
Current executable set to
'ClionProjects/bug_test/cmake-build-debug/bug_test' (x86_64).
(lldb) b main.cpp:10
Breakpoint 1: where = bug_test`main + 4 at main.cpp:10, address =
0x0000000000000993
(lldb) r
Process 2545 launched:
'/home/user/ClionProjects/bug_test/cmake-build-debug/bug_test' (x86_64)
Process 2545 stopped
* thread #1: tid = 2545, 0x0000555555554993 bug_test`main + 4 at
main.cpp:10, name = 'bug_test', stop reason = breakpoint 1.1
frame #0: 0x0000555555554993 bug_test`main + 4 at main.cpp:10
7 }
8
9 int main() {
-> 10 printHello();
11 std::cout << "Hello, World! from main()" << std::endl;
12 std::cout << "Hello, World! from main()" << std::endl;
13 std::cout << "Hello, World! from main()" << std::endl;
(lldb) s
Process 2545 stopped
* thread #1: tid = 2545, 0x0000555555554914 bug_test`printHello() + 4 at
main.cpp:4, name = 'bug_test', stop reason = step in
frame #0: 0x0000555555554914 bug_test`printHello() + 4 at main.cpp:4
1 #include <iostream>
2
3 void printHello() {
-> 4 std::cout << "Hello, World! from function" << std::endl;
5 std::cout << "Hello, World! from function" << std::endl;
6 std::cout << "Hello, World! from function" << std::endl;
7 }
(lldb) s
Hello, World! from function
Hello, World! from function
Hello, World! from function
Process 2545 stopped
* thread #1: tid = 2545, 0x0000555555554998 bug_test`main + 9 at
main.cpp:11, name = 'bug_test', stop reason = step in
frame #0: 0x0000555555554998 bug_test`main + 9 at main.cpp:11
8
9 int main() {
10 printHello();
-> 11 std::cout << "Hello, World! from main()" << std::endl;
12 std::cout << "Hello, World! from main()" << std::endl;
13 std::cout << "Hello, World! from main()" << std::endl;
14 return 0;
(lldb) s
Hello, World! from main()
Hello, World! from main()
Hello, World! from main()
Process 2545 stopped
* thread #1: tid = 2545, 0x00007ffff76a93f1 libc.so.6`__libc_start_main +
241, name = 'bug_test', stop reason = step in
frame #0: 0x00007ffff76a93f1 libc.so.6`__libc_start_main + 241
libc.so.6`__libc_start_main:
-> 0x7ffff76a93f1 <+241>: movl %eax, %edi
0x7ffff76a93f3 <+243>: callq 0x7ffff76c3320 ; exit
0x7ffff76a93f8 <+248>: xorl %eax, %eax
0x7ffff76a93fa <+250>: jmp 0x7ffff76a9337 ; <+55>
(lldb)
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