diff -Naur -X exclude-files ac_cur/arch/um/include/kern_util.h ac/arch/um/include/kern_util.h
--- ac_cur/arch/um/include/kern_util.h	Sun Jun  3 18:18:11 2001
+++ ac/arch/um/include/kern_util.h	Sun Jun  3 18:27:58 2001
@@ -115,6 +115,7 @@
 extern int attach_debugger(int idle_pid, int pid);
 extern void *round_up(unsigned long addr);
 extern void *round_down(unsigned long addr);
+extern void bad_segv(unsigned long address, unsigned long ip, int is_write);
 #endif
 
 /*
diff -Naur -X exclude-files ac_cur/arch/um/include/sysdep-i386/sigcontext.h ac/arch/um/include/sysdep-i386/sigcontext.h
--- ac_cur/arch/um/include/sysdep-i386/sigcontext.h	Sun Jun  3 18:18:11 2001
+++ ac/arch/um/include/sysdep-i386/sigcontext.h	Sun Jun  3 18:32:04 2001
@@ -11,6 +11,7 @@
 #define SC_FAULT_WRITE(sc) (((sc)->err) & 2)
 #define SC_IP(sc) ((sc)->eip)
 #define SC_SP(sc) ((sc)->esp_at_signal)
+#define SEGV_IS_FIXABLE(sc) ((sc)->trapno == 14)
 
 #endif
 
diff -Naur -X exclude-files ac_cur/arch/um/include/sysdep-ppc/sigcontext.h ac/arch/um/include/sysdep-ppc/sigcontext.h
--- ac_cur/arch/um/include/sysdep-ppc/sigcontext.h	Sun Jun  3 18:18:11 2001
+++ ac/arch/um/include/sysdep-ppc/sigcontext.h	Sun Jun  3 18:28:09 2001
@@ -33,6 +33,7 @@
 
 #define SC_IP(sc) ((sc)->regs->nip)
 #define SC_SP(sc) ((sc)->regs->gpr[1])
+#define SEGV_IS_FIXABLE(sc) (1)
 
 #endif
 
diff -Naur -X exclude-files ac_cur/arch/um/kernel/trap_kern.c ac/arch/um/kernel/trap_kern.c
--- ac_cur/arch/um/kernel/trap_kern.c	Sun Jun  3 18:18:11 2001
+++ ac/arch/um/kernel/trap_kern.c	Sun Jun  3 18:31:21 2001
@@ -99,6 +99,20 @@
 	return(0);
 }
 
+void bad_segv(unsigned long address, unsigned long ip, int is_write)
+{
+	struct siginfo si;
+
+	printk(KERN_ERR "Unfixable SEGV in '%s' (pid %d) at 0x%lx "
+	       "(ip 0x%lx)\n", current->comm, current->pid, address, ip);
+	si.si_signo = SIGSEGV;
+	si.si_code = SEGV_ACCERR;
+	si.si_addr = (void *) address;
+	current->thread.cr2 = address;
+	current->thread.err = is_write;
+	force_sig_info(SIGSEGV, &si, current);
+}
+
 void relay_signal(int sig, void *sc, int usermode)
 {
 	force_sig(sig, current);
diff -Naur -X exclude-files ac_cur/arch/um/kernel/trap_user.c ac/arch/um/kernel/trap_user.c
--- ac_cur/arch/um/kernel/trap_user.c	Sun Jun  3 18:18:11 2001
+++ ac/arch/um/kernel/trap_user.c	Sun Jun  3 18:29:15 2001
@@ -280,6 +280,11 @@
 	struct sigcontext_struct *context = sc;
 	int index;
 
+	if(!SEGV_IS_FIXABLE(context)){
+		bad_segv(SC_FAULT_ADDR(context), SC_IP(context), 
+			 SC_FAULT_WRITE(context));
+		return;
+	}
 	lock_trap();
 	index = segfault_index++;
 	if(segfault_index == 1024) segfault_index = 0;