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-rw-r--r--sys/fs/procfs/procfs_ctl.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/fs/procfs/procfs_ctl.c b/sys/fs/procfs/procfs_ctl.c
index 15ed718..88ce6dd 100644
--- a/sys/fs/procfs/procfs_ctl.c
+++ b/sys/fs/procfs/procfs_ctl.c
@@ -144,7 +144,9 @@ procfs_control(struct thread *td, struct proc *p, int op)
* Stop the target.
*/
p->p_flag |= P_TRACED;
+ mtx_lock_spin(&sched_lock);
faultin(p);
+ mtx_unlock_spin(&sched_lock);
p->p_xstat = 0; /* XXX ? */
if (p->p_pptr != td->td_proc) {
p->p_oppid = p->p_pptr->p_pid;
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