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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LLDB steps incorrectly for binaries compiled using GCC 6.2 on Ubuntu 16.10"
href="https://llvm.org/bugs/show_bug.cgi?id=31212">31212</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LLDB steps incorrectly for binaries compiled using GCC 6.2 on Ubuntu 16.10
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>3.9
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<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>eldar.abusalimov@jetbrains.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>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)</pre>
</div>
</p>
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