fix race condition in rsyscall handler

[musl] / src / thread / pthread_create.c

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 9df4f71..344b39f 100644 (file)
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -85,7 +85,7 @@ static void rsyscall_handler(int sig, siginfo_t *si, void *ctx)
        /* Threads which have already decremented themselves from the
         * thread count must not increment rs.cnt or otherwise act. */
        if (self->dead) {
-               __wait(&rs.hold, 0, 1, 1);
+               sigaddset(&((ucontext_t *)ctx)->uc_sigmask, SIGSYSCALL);
                return;
        }