D26585.id79297.diff
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	Index: head/sys/kern/subr_syscall.c
	===================================================================
	--- head/sys/kern/subr_syscall.c
	+++ head/sys/kern/subr_syscall.c
	@@ -97,21 +97,22 @@
	if (p->p_ptevents & PTRACE_SCE)
	ptracestop((td), SIGTRAP, NULL);
	PROC_UNLOCK(p);
	- }
	- if (__predict_false((td->td_dbgflags & TDB_USERWR) != 0)) {
	- /*
	- * Reread syscall number and arguments if debugger
	- * modified registers or memory.
	- */
	- error = (p->p_sysent->sv_fetch_syscall_args)(td);
	- se = sa->callp;
	+
	+ if ((td->td_dbgflags & TDB_USERWR) != 0) {
	+ /*
	+ * Reread syscall number and arguments if debugger
	+ * modified registers or memory.
	+ */
	+ error = (p->p_sysent->sv_fetch_syscall_args)(td);
	+ se = sa->callp;
	#ifdef KTRACE
	- if (KTRPOINT(td, KTR_SYSCALL))
	- ktrsyscall(sa->code, se->sy_narg, sa->args);
	+ if (KTRPOINT(td, KTR_SYSCALL))
	+ ktrsyscall(sa->code, se->sy_narg, sa->args);
	#endif
	- if (error != 0) {
	- td->td_errno = error;
	- goto retval;
	+ if (error != 0) {
	+ td->td_errno = error;
	+ goto retval;
	+ }
	}
	}