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D61139.1794105933.diff
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diff --git a/sys/kern/subr_syscall.c b/sys/kern/subr_syscall.c
--- a/sys/kern/subr_syscall.c
+++ b/sys/kern/subr_syscall.c
@@ -203,7 +203,13 @@
(uintptr_t)td, "pid:%d", td->td_proc->p_pid, "error:%d", error,
"retval0:%#lx", td->td_retval[0], "retval1:%#lx",
td->td_retval[1]);
- if (__predict_false(traced)) {
+ /*
+ * Refresh tracing state after syscall execution, but still clear flags
+ * left behind if the debugger detached.
+ */
+ traced = (p->p_flag & P_TRACED) != 0;
+ if (__predict_false(traced || (td->td_dbgflags & (TDB_SCE |
+ TDB_BOUNDARY | TDB_SET_SC_RET)) != 0)) {
PROC_LOCK(p);
td->td_dbgflags &= ~(TDB_SCE | TDB_BOUNDARY | TDB_SET_SC_RET);
PROC_UNLOCK(p);

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