commit 3b001d133aa0e1661f64d2df0a683aa6d10bc955
Author: Russ Cox <rsc@golang.org>
Date:   Sun Mar 2 14:31:15 2025 -0500

    sys/src/9k: fix bug aliasing parent and child FP state after fork
    
    The state would get unaliased by a future exec, because it
    would become fpustate == Init, which would in turn
    recompute up->fpusave. But until then, parent and child
    would share the FPU state.

diff --git a/sys/src/9k/k10/fpu.c b/sys/src/9k/k10/fpu.c
index 1fe2db54..b9db40ba 100755
--- a/sys/src/9k/k10/fpu.c
+++ b/sys/src/9k/k10/fpu.c
@@ -163,7 +163,7 @@ fpusysrforkchild(Proc* child, Proc* parent)
 	 * Copy the parent FPU state to the child.
 	 */
 	child->fpustate = parent->fpustate;
-	child->fpusave = (void*)((PTR2UINT(up->fxsave) + 15) & ~15);
+	child->fpusave = (void*)((PTR2UINT(child->fxsave) + 15) & ~15);
 	if(child->fpustate == Init)
 		return;