[Bug breakpoints/29164] New: [Multithread] Finish never return when a breakpoint hit

["zakaria.ternane at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29164

            Bug ID: 29164
           Summary: [Multithread] Finish never return when a breakpoint
                    hit
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: zakaria.ternane at gmail dot com
  Target Milestone: ---

Created attachment 14110
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14110&action=edit
Minimal Working Exemple

OS : macOS Monterey / Linux

Hello,

When using the finish command in a gdb session consisting of two
threads, the finish is never hit if a breakpoint is hit in the other
thread before hitting the finish point.

In the following example, I have two threads and I set breakpoints on
"pthread_mutex_lock" and on "pthread_join" (pthread lib).  When the
first breakpoint is hit (on pthread_mutex_lock), I send the ```finish```
command. Then, the "join" breakpoint is hit and the even using
continue, the finish is never call back again.

#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>

int val = 0;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

void* fa(__attribute__((unused)) void* unused){
    pthread_mutex_lock(&mutex);
    val++;
    pthread_mutex_unlock(&mutex);
    return NULL;

}

int main(){
    pthread_t t1;

    printf("Value = %d\n", val);

    pthread_create(&t1, NULL, &fa, NULL);

    val += 10;

    pthread_join(t1, NULL);

    printf("Value = %d\n", val);

    return 0;
}

Sincerely,

Zakaria Ternane

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