Bug 435000

+++ This bug was initially created as a clone of Bug #434995 +++

Description of problem:
On a GDB testcase was found i386 debugger running on x86_64 kernel accidentally
causes ERESTARTSYS to be returned in errno in the process being debugged.
It is not reproducible on an i386 debugger on an i386 kernel.
It is not reproducible on an x86_64 debugger on an x86_64 kernel.

Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-55.EL.x86_64

How reproducible:
Always, reliably.

Steps to Reproduce:
1. wget
http://sources.redhat.com/cgi-bin/cvsweb.cgi/~checkout~/tests/ptrace-tests/tests/erestartsys.c?cvsroot=systemtap
2. gcc -o erestartsys erestartsys.c -Wall -ggdb2 -D_GNU_SOURCE -m32
-lutil;./erestartsys;echo $?

Actual results:
1

Expected results:
0

Additional info:
Correct (0):
  /* kernel-2.6.23.15-137.fc8.x86_64 -m64.  */
  /* kernel.org 2.6.22-rc4-git7 x86_64 -m64.  */
  /* kernel-2.6.23.15-137.fc8.i686 (-m32).  */
Broken (1):
  /* kernel.org 2.6.22-rc4-git7 x86_64 on -m32.  */
  /* kernel-2.6.23.15-137.fc8.x86_64 -m32.  */
Unsupported restarting (77):
  /* kernel.org 2.4.33 i686.  */
  /* kernel-2.6.18-53.el5.s390x -m64.  */

The GDB case:
cd
/home/jkratoch/redhat/fedora/gdb/devel-m32/gdb-6.7.1/build-i386-redhat-linux-gnu/gdb/testsuite
$ file ../gdb gdb.base/interrupt
../gdb:             ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
gdb.base/interrupt: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
$ ../gdb gdb.base/interrupt
GNU gdb Red Hat Linux (6.7.1-15.fc8rh)
Copyright (C) 2007 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) run
Starting program:
/home/jkratoch/redhat/fedora/gdb/devel-m32/gdb-6.7.1/build-i386-redhat-linux-gnu/gdb/testsuite/gdb.base/interrupt

Missing separate debuginfo for /lib/ld-linux.so.2
Try: yum --enablerepo='*-debuginfo' install
/usr/lib/debug/.build-id/ac/2eeb206486bb7315d6ac4cd64de0cb50838ff6.debug
Missing separate debuginfo for /lib/libm.so.6
Try: yum --enablerepo='*-debuginfo' install
/usr/lib/debug/.build-id/92/8ab51a53627c59877a85dd9afecc1619ca866c.debug
Missing separate debuginfo for /lib/libc.so.6
Try: yum --enablerepo='*-debuginfo' install
/usr/lib/debug/.build-id/ba/4ea1118691c826426e9410cafb798f25cefad5.debug
talk to me baby

<--- Put CTRL-C from the console here.

Program received signal SIGINT, Interrupt.
0xffffe410 in __kernel_vsyscall ()
(gdb) p func1 ()
$1 = 4
(gdb) cont
Continuing.
Unknown error 512

^^^ The message `Unknown error 512' should have never been seen.