Patch to ensure e_machine is properly initialized in some cases where

we attach to a running multi-threaded process.

diff -rup a/proc.c b/proc.c

--- a/proc.c	2019-02-28 17:32:50.020734842 -0500

+++ b/proc.c	2019-02-28 21:04:31.179942091 -0500

@@ -38,6 +38,7 @@

 #include "breakpoint.h"

 #include "debug.h"

 #include "fetch.h"

+#include "ltrace-elf.h"

 #include "options.h"

 #include "proc.h"

 #include "value_dict.h"

@@ -218,6 +219,21 @@ process_init(struct process *proc, const

 		return -1;

 	}

+	{

+	       struct ltelf lte;

+

+	       if (ltelf_init(&lte, filename) < 0) {

+		       process_bare_destroy(proc, 0);

+		       goto fail;

+	       }

+

+	       proc->e_machine = lte.ehdr.e_machine;

+	       proc->e_class = lte.ehdr.e_ident[EI_CLASS];

+	       get_arch_dep(proc);

+

+	       ltelf_destroy(<e;;

+       }

+

 	if (os_process_init(proc) < 0) {

 		process_bare_destroy(proc, 0);

 		goto fail;

diff -rup a/sysdeps/linux-gnu/x86/fetch.c b/sysdeps/linux-gnu/x86/fetch.c

--- a/sysdeps/linux-gnu/x86/fetch.c	2019-02-28 17:32:50.168810377 -0500

+++ b/sysdeps/linux-gnu/x86/fetch.c	2019-02-28 20:57:32.162800555 -0500

@@ -275,6 +275,9 @@ allocate_integer(struct fetch_context *c

 #undef HANDLE32

 		}

+		assert(!"Unknown machine architecture");

+		abort();

+

 	case POOL_RETVAL:

 		switch (context->ireg) {

 #ifdef __x86_64__