<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/60408>60408</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
lldb leaves inferior stopped at breakpoint even after detaching
</td>
</tr>
<tr>
<th>Labels</th>
<td>
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
godlygeek
</td>
</tr>
</table>
<pre>
Given this C++11 program in a file called `test.cpp`:
```cpp
#include <thread>
#include <vector>
#include <unistd.h>
void getpid_eventually()
{
sleep(2);
getpid();
}
int main()
{
std::vector<std::thread> threads;
for (int i = 0; i < 5; ++i) {
threads.emplace_back(getpid_eventually);
}
for (auto& thread: threads) {
thread.join();
}
}
```
Compiled with `g++ -std=c++11 test.cpp -lpthread -o test`
This `lldb` command line consistently results in the inferior process remaining in a stopped state even after `lldb` has detached and exited:
```sh
./test & sleep 1; lldb --batch -o "br set -b getpid -C 'breakpoint disable' -C 'thread list'" -o "continue" -p $!
```
That is, run the executable in the background, sleep 1 second (until threads have been spawned and are blocked in `sleep`), and then attach to it in batch mode, set a breakpoint with commands, and continue.
The full output is:
```log
(lldb) process attach --pid 16532 [35/6718]
Process 16532 stopped
* thread #1, name = 'test', stop reason = signal SIGSTOP
frame #0: 0x00007fe7a656b017 libpthread.so.0`pthread_join + 167
libpthread.so.0`pthread_join:
-> 0x7fe7a656b017 <+167>: cmpl $0x0, (%rdi)
0x7fe7a656b01a <+170>: jne 0x7fe7a656b00e ; <+158>
0x7fe7a656b01c <+172>: movl %r8d, %edi
0x7fe7a656b01f <+175>: callq 0x7fe7a65704a0 ; __pthread_disable_asynccancel
thread #2, name = 'test', stop reason = signal SIGSTOP
frame #0: 0x00007fe7a5a399fd libc.so.6`__nanosleep + 45
libc.so.6`__nanosleep:
-> 0x7fe7a5a399fd <+45>: movq (%rsp), %rdi
0x7fe7a5a39a01 <+49>: movq %rax, %rdx
0x7fe7a5a39a04 <+52>: callq 0x7fe7a5a80890 ; __libc_disable_asynccancel
0x7fe7a5a39a09 <+57>: movq %rdx, %rax
thread #3, name = 'test', stop reason = signal SIGSTOP
frame #0: 0x00007fe7a5a399fd libc.so.6`__nanosleep + 45
libc.so.6`__nanosleep:
-> 0x7fe7a5a399fd <+45>: movq (%rsp), %rdi
0x7fe7a5a39a01 <+49>: movq %rax, %rdx
0x7fe7a5a39a04 <+52>: callq 0x7fe7a5a80890 ; __libc_disable_asynccancel
0x7fe7a5a39a09 <+57>: movq %rdx, %rax
thread #4, name = 'test', stop reason = signal SIGSTOP
frame #0: 0x00007fe7a5a399fd libc.so.6`__nanosleep + 45
libc.so.6`__nanosleep:
-> 0x7fe7a5a399fd <+45>: movq (%rsp), %rdi
0x7fe7a5a39a01 <+49>: movq %rax, %rdx
0x7fe7a5a39a04 <+52>: callq 0x7fe7a5a80890 ; __libc_disable_asynccancel
0x7fe7a5a39a09 <+57>: movq %rdx, %rax
thread #5, name = 'test', stop reason = signal SIGSTOP
frame #0: 0x00007fe7a5a399fd libc.so.6`__nanosleep + 45
libc.so.6`__nanosleep:
-> 0x7fe7a5a399fd <+45>: movq (%rsp), %rdi
0x7fe7a5a39a01 <+49>: movq %rax, %rdx
0x7fe7a5a39a04 <+52>: callq 0x7fe7a5a80890 ; __libc_disable_asynccancel
0x7fe7a5a39a09 <+57>: movq %rdx, %rax
thread #6, name = 'test', stop reason = signal SIGSTOP
frame #0: 0x00007fe7a5a399fd libc.so.6`__nanosleep + 45
libc.so.6`__nanosleep:
-> 0x7fe7a5a399fd <+45>: movq (%rsp), %rdi
0x7fe7a5a39a01 <+49>: movq %rax, %rdx
0x7fe7a5a39a04 <+52>: callq 0x7fe7a5a80890 ; __libc_disable_asynccancel
0x7fe7a5a39a09 <+57>: movq %rdx, %rax
Executable module set to "/home/mwoznisk/sandbox/lldb_breakpoint_after_detach/test".
Architecture set to: x86_64-unknown-linux-gnu.
(lldb) breakpoint set -b getpid -C 'breakpoint disable' -C 'thread list'
Breakpoint 1: 2 locations.
(lldb) continue
(lldb) breakpoint disable
All breakpoints disabled. (1 breakpoints)
(lldb) thread list
Process 16532 stopped
* thread #1: tid = 16532, 0x00007fe7a656b017 libpthread.so.0`pthread_join + 167, name = 'test'
thread #2: tid = 16534, 0x00007fe7a5a3a9a0 libc.so.6`getpid, name = 'test', stop reason = breakpoint 1.
thread #3: tid = 16535, 0x00007fe7a5a3a9a0 libc.so.6`getpid, name = 'test', stop reason = breakpoint 1.
thread #4: tid = 16536, 0x00007fe7a5a3a9a0 libc.so.6`getpid, name = 'test', stop reason = breakpoint 1.
thread #5: tid = 16537, 0x00007fe7a5a3a9a0 libc.so.6`getpid, name = 'test', stop reason = breakpoint 1.
thread #6: tid = 16538, 0x00007fe7a5a3a9a0 libc.so.6`getpid, name = 'test', stop reason = breakpoint 1.
Process 16532 resuming
Process 16532 stopped
* thread #2, name = 'test', stop reason = breakpoint 1.
frame #0: 0x00007fe7a5a3a9a0 libc.so.6`getpid
libc.so.6`getpid:
-> 0x7fe7a5a3a9a0 <+0>: movl %fs:0x2d4, %edx
0x7fe7a5a3a9a8 <+8>: cmpl $0x0, %edx
0x7fe7a5a3a9ab <+11>: movl %edx, %eax
0x7fe7a5a3a9ad <+13>: jle 0x7fe7a5a3a9b1 ; <+17>
thread #3, name = 'test', stop reason = breakpoint 1.
frame #0: 0x00007fe7a5a3a9a0 libc.so.6`getpid
libc.so.6`getpid:
-> 0x7fe7a5a3a9a0 <+0>: movl %fs:0x2d4, %edx
0x7fe7a5a3a9a8 <+8>: cmpl $0x0, %edx
0x7fe7a5a3a9ab <+11>: movl %edx, %eax
0x7fe7a5a3a9ad <+13>: jle 0x7fe7a5a3a9b1 ; <+17>
thread #4, name = 'test', stop reason = breakpoint 1.
frame #0: 0x00007fe7a5a3a9a0 libc.so.6`getpid
libc.so.6`getpid:
-> 0x7fe7a5a3a9a0 <+0>: movl %fs:0x2d4, %edx
0x7fe7a5a3a9a8 <+8>: cmpl $0x0, %edx
0x7fe7a5a3a9ab <+11>: movl %edx, %eax
0x7fe7a5a3a9ad <+13>: jle 0x7fe7a5a3a9b1 ; <+17>
thread #5, name = 'test', stop reason = breakpoint 1.
frame #0: 0x00007fe7a5a3a9a0 libc.so.6`getpid
libc.so.6`getpid:
-> 0x7fe7a5a3a9a0 <+0>: movl %fs:0x2d4, %edx
0x7fe7a5a3a9a8 <+8>: cmpl $0x0, %edx
0x7fe7a5a3a9ab <+11>: movl %edx, %eax
0x7fe7a5a3a9ad <+13>: jle 0x7fe7a5a3a9b1 ; <+17>
thread #6, name = 'test', stop reason = breakpoint 1.
frame #0: 0x00007fe7a5a3a9a0 libc.so.6`getpid
libc.so.6`getpid:
-> 0x7fe7a5a3a9a0 <+0>: movl %fs:0x2d4, %edx
0x7fe7a5a3a9a8 <+8>: cmpl $0x0, %edx
0x7fe7a5a3a9ab <+11>: movl %edx, %eax
0x7fe7a5a3a9ad <+13>: jle 0x7fe7a5a3a9b1 ; <+17>
[2] + suspended (signal) ./test
```
After which, listing the jobs in my `zsh` shell shows:
```
[2] + suspended (signal) ./test
```
until I foreground it or prod it with a SIGCONT.
This reproduces in lldb 10.0.0, lldb 15.0.4, and in a debug build of `main`.
</pre>
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