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Index: head/sys/kern/subr_syscall.c
===================================================================
--- head/sys/kern/subr_syscall.c
+++ head/sys/kern/subr_syscall.c
@@ -63,14 +63,14 @@
td->td_pticks = 0;
if (td->td_cowgen != p->p_cowgen)
thread_cow_update(td);
- if (p->p_flag & P_TRACED) {
- traced = 1;
+ traced = (p->p_flag & P_TRACED) != 0;
+ if (traced || td->td_dbgflags & TDB_USERWR) {
PROC_LOCK(p);
td->td_dbgflags &= ~TDB_USERWR;
- td->td_dbgflags |= TDB_SCE;
+ if (traced)
+ td->td_dbgflags |= TDB_SCE;
PROC_UNLOCK(p);
- } else
- traced = 0;
+ }
error = (p->p_sysent->sv_fetch_syscall_args)(td, sa);
#ifdef KTRACE
if (KTRPOINT(td, KTR_SYSCALL))

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