D3973.id9601.diff
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	Index: sys/kern/kern_fork.c
	===================================================================
	--- sys/kern/kern_fork.c
	+++ sys/kern/kern_fork.c
	@@ -471,6 +471,7 @@
	td2->td_sigstk = td->td_sigstk;
	td2->td_flags = TDF_INMEM;
	td2->td_lend_user_pri = PRI_MAX;
	+ td2->td_pflags \|= TDP_FORKING;

	#ifdef VIMAGE
	td2->td_vnet = NULL;
	@@ -1023,6 +1024,7 @@

	if (p->p_sysent->sv_schedtail != NULL)
	(p->p_sysent->sv_schedtail)(td);
	+ td->td_pflags &= ~TDP_FORKING;
	}

	/*
	Index: sys/sys/proc.h
	===================================================================
	--- sys/sys/proc.h
	+++ sys/sys/proc.h
	@@ -446,7 +446,7 @@
	#define TDP_RESETSPUR 0x04000000 /* Reset spurious page fault history. */
	#define TDP_NERRNO 0x08000000 /* Last errno is already in td_errno */
	#define TDP_UIOHELD 0x10000000 /* Current uio has pages held in td_ma */
	-#define TDP_UNUSED29 0x20000000 /* --available-- */
	+#define TDP_FORKING 0x20000000 /* Thread is being created through fork() */
	#define TDP_EXECVMSPC 0x40000000 /* Execve destroyed old vmspace */

	/*