While looking into supporting threaded debugging on FreeBSD I
discovered an issue in the Linux implementation.
ProcessPOSIX::SendMessage now looks up a POSIXThread in m_thread_list
by tid, but is called from ::MonitorCallback with the pid of the
process. As it happens this usually works on Linux, because the first
(or only) thread's tid is equal to the pid, resulting in a successful
FindThreadByID. However, this fails if the main thread exits.
I set up a Debian VM to explore this, and the test case below causes
lldb to hang.
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
void *
thread(void *arg)
{
sleep(1);
abort();
}
int
main(int argc, char *argv[])
{
pthread_t td;
pthread_create(&td, NULL, thread, NULL);
pthread_exit(NULL);
return 0;
}
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