diff -up ./arch/x86/Kconfig.cpu.pref ./arch/x86/Kconfig.cpu
--- ./arch/x86/Kconfig.cpu.pref	2026-05-29 19:43:56.437070767 +0900
+++ ./arch/x86/Kconfig.cpu	2026-05-29 19:54:47.938471518 +0900
@@ -395,6 +395,16 @@ config IGNORE_SSP_OPCODE
 
 	  If you are not sure, say N.
 
+config CPU_IGNORE_PREFETCH
+	bool "Skip unrecognized prefetch opcodes"
+	depends on X86_32 && CPU_EMU486
+	help
+	Skips uncoditionally used prefetcht0, prefetcht1, prefetcht2, prefetchnta opcodes
+	on unsupported CPUs, with otherwise causes SIGILL.
+	gc package includes this.
+
+	If you are not sure, say N.
+
 config CPU_EMU_FUCOMI
 	bool "Pentium-Pro FCOMI,FCMOVcc emulation"
 	depends on X86_32 && CPU_EMU486
diff -up ./arch/x86/configs/i386_defconfig.pref ./arch/x86/configs/i386_defconfig
--- ./arch/x86/configs/i386_defconfig.pref	2026-05-29 19:43:56.437070767 +0900
+++ ./arch/x86/configs/i386_defconfig	2026-05-29 19:54:47.938471518 +0900
@@ -34,6 +34,7 @@ CONFIG_SMP=y
 # CONFIG_CPU_EMU486_DEBUG is not set
 # CONFIG_GEODE_NOPL is not set
 # CONFIG_IGNORE_SSP_OPCODE is not set
+# CONFIG_CPU_IGNORE_PREFETCH is not set
 # CONFIG_CPU_EMU_FUCOMI is not set
 # CONFIG_CPU_PROC_EMULATED_OPS is not set
 # CONFIG_CPU_PROC_EMULATED_FILES is not set
diff -up ./arch/x86/kernel/traps.c.pref ./arch/x86/kernel/traps.c
--- ./arch/x86/kernel/traps.c.pref	2026-05-29 19:43:56.439070774 +0900
+++ ./arch/x86/kernel/traps.c	2026-05-29 19:54:47.940471519 +0900
@@ -1491,6 +1491,29 @@ static void handle_invalid_op(struct pt_
 	}
 #endif /* CONFIG_GEODE_NOPL */
 
+#ifdef CONFIG_CPU_IGNORE_PREFETCH
+	if (op1 == 0x0F && op2 == 0x18) { /* 0f 18 /1|/2|/3|/0 prefetch */
+		int mod;
+		get_user(op3, eip+2);
+		mod = op3 & 0b00111000;
+		switch (mod) {
+		case 1<<3:	/* prefetch0 m8 */
+			regs->ip = (u32)skip_modrm(eip+3, 32, op3);
+			return;
+		case 2<<3:	/* prefetch1 m8 */
+			regs->ip = (u32)skip_modrm(eip+3, 32, op3);
+			return;
+		case 3<<3:	/* prefetch2 m8 */
+			regs->ip = (u32)skip_modrm(eip+3, 32, op3);
+			return;
+		case 0<<3:	/* prefetchnta m8 */
+			regs->ip = (u32)skip_modrm(eip+3, 32, op3);
+			return;
+		default: break; /* unrecognized */
+		}
+	}
+#endif
+
 #ifdef CONFIG_CPU_EMU_FUCOMI
 	/* FCOMI, FCOMIP, FUCOMI, FUCOMIP emulation */
 	if (op1 == 0xDB) {