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-rw-r--r--sys/kern/kern_sig.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index ab98bb0..26ad4b1 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -1498,7 +1498,8 @@ trapsignal(struct thread *td, int sig, u_long code)
p = td->td_proc;
if (td->td_flags & TDF_SA) {
- thread_user_enter(p, td);
+ if (td->td_mailbox == NULL)
+ thread_user_enter(p, td);
PROC_LOCK(p);
if (td->td_mailbox) {
SIGDELSET(td->td_sigmask, sig);
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