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Bug#728705: gdb fails on s390x with "Couldn't write registers: Invalid argument"

Package: gdb
Version: 7.6.1-1
Severity: important
X-Debbugs-CC: debian-s390@lists.debian.org

Dear Maintainer,

gdb seems to be completely useless on s390x. I tried running it against
various executables (both buggy and sane). gdb seems to launch the
executable, however the subprocess doesn't seem to be doing anything.
gdb just gives a message, but it does not even seem to consider the
situation fatal and just seats there, apparently considering that the
subprocess is running faultlessly. Example session on "echo foo", notice
how "foo" is not echoed:

________________ GDB SESSION _______________________

(sid_s390x-dchroot)thibaut@zelenka:~$ gdb --args echo foo
GNU gdb (GDB) 7.6.1 (Debian 7.6.1-1)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
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 "s390x-linux-gnu".
For bug reporting instructions, please see:
Reading symbols from /bin/echo...(no debugging symbols found)...done.
(gdb) run
Starting program: /bin/echo foo
Couldn't write registers: Invalid argument.
(gdb) bt
Target is executing.
(gdb) quit
A debugging session is active.

	Inferior 1 [process 18228] will be killed.

Quit anyway? (y or n) y

________________ END GDB SESSION _________________________

Kind regards, Thibaut.

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: s390x

Kernel: Linux 3.2.0-4-s390x (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash

Versions of packages gdb depends on:
ii  gdbserver     7.6.1-1
ii  libc6         2.17-93
ii  libexpat1     2.1.0-4
ii  liblzma5      5.1.1alpha+20120614-2
ii  libncurses5   5.9+20130608-1
ii  libpython2.7  2.7.5-8
ii  libreadline6  6.2+dfsg-0.1
ii  libtinfo5     5.9+20130608-1
ii  zlib1g        1:1.2.8.dfsg-1

Versions of packages gdb recommends:
pn  libc-dbg  <none>

Versions of packages gdb suggests:
pn  gdb-doc  <none>

-- no debconf information

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