[Bug gdb/16468] New: gdb fails on s390x with "Couldn't write registers: Invalid argument"

["naesten at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16468

            Bug ID: 16468
           Summary: gdb fails on s390x with "Couldn't write registers:
                    Invalid argument"
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: naesten at gmail dot com

Some of us at Debian have noticed that GDB isn't working in s390x sid chroots
on the s390 porterbox, zelenka.debian.org.

Observe:

sbronson@zelenka:~/strace-code$ uname -a
Linux zelenka 3.2.0-4-s390x #1 SMP Debian 3.2.51-1 s390x GNU/Linux
sbronson@zelenka:~/strace-code$ dpkg-query -W linux-image-3.2.0-4-s390x
linux-image-3.2.0-4-s390x       3.2.51-1
sbronson@zelenka:~/strace-code$ schroot -r -c $CHROOT
<-code$ strace -e ptrace gdb -batch -ex run -ex bt --args echo foo
--- SIGCHLD (Child exited) @ 0 (0) ---
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_CONT, 22210, 0x1, SIG_0)  = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_SETOPTIONS, 22210, 0, PTRACE_O_TRACEFORK) = 0
ptrace(PTRACE_SETOPTIONS, 22211, 0, PTRACE_O_TRACEFORK) = 0
ptrace(PTRACE_SETOPTIONS, 22211, 0, PTRACE_O_TRACEFORK|PTRACE_O_TRACEVFORKDONE)
= 0
ptrace(PTRACE_CONT, 22211, 0, SIG_0)    = 0
ptrace(PTRACE_GETEVENTMSG, 22211, 0, 0x3ffffdb1af8) = 0
ptrace(PTRACE_KILL, 22212, 0, 0)        = 0
ptrace(PTRACE_KILL, 22211, 0, 0)        = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_SETOPTIONS, 22210, 0,
PTRACE_O_TRACEFORK|PTRACE_O_TRACEVFORK|PTRACE_O_TRACECLONE|PTRACE_O_TRACEEXEC|PTRACE_O_TRACEVFORKDONE)
= 0
ptrace(PTRACE_SETOPTIONS, 22210, 0, PTRACE_O_TRACESYSGOOD) = 0
ptrace(PTRACE_SETOPTIONS, 22210, 0,
PTRACE_O_TRACESYSGOOD|PTRACE_O_TRACEFORK|PTRACE_O_TRACEVFORK|PTRACE_O_TRACECLONE|PTRACE_O_TRACEEXEC|PTRACE_O_TRACEVFORKDONE)
= 0
ptrace(0x4204 /* PTRACE_??? */, 22210, 0x306, 0x3ffffdb1cb8) = 0
ptrace(0x4204 /* PTRACE_??? */, 22210, 0x307, 0x3ffffdb1cb8) = 0
ptrace(PTRACE_PEEKUSER, 22210, psw_mask, [0x705c00180000000]) = 0
ptrace(0x5000 /* PTRACE_??? */, 22210, 0x3ffffdb1af0, 0x3fffcc2db28) = 0
ptrace(PTRACE_PEEKUSER, 22210, psw_mask, [0x705c00180000000]) = 0
.
.
.
ptrace(PTRACE_PEEKUSER, 22210, psw_mask, [0x705c00180000000]) = 0
ptrace(PTRACE_PEEKTEXT, 22210, 0x80007ef8, [0]) = 0
ptrace(PTRACE_PEEKUSER, 22210, psw_mask, [0x705c00180000000]) = 0
.
.
.
ptrace(PTRACE_PEEKUSER, 22210, psw_mask, [0x705c00180000000]) = 0
ptrace(PTRACE_PEEKTEXT, 22210, 0x80007ef8, [0]) = 0
ptrace(0x4204 /* PTRACE_??? */, 22210, 0x307, 0x3ffffdb19e8) = 0
ptrace(0x4205 /* PTRACE_??? */, 22210, 0x307, 0x3ffffdb19e8) = 0
ptrace(PTRACE_PEEKTEXT, 22210, 0x3fffdfeb6d0, [0xfddc070707fe0707]) = 0
ptrace(PTRACE_PEEKTEXT, 22210, 0x3fffdfeb6d0, [0xfddc070707fe0707]) = 0
ptrace(PTRACE_POKEDATA, 22210, 0x3fffdfeb6d0, 0xfddc070700010707) = 0
ptrace(PTRACE_CONT, 22210, 0x1, SIG_0)  = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(0x5000 /* PTRACE_??? */, 22210, 0x3ffffdb1548, 0x3fffcc2db28) = 0
ptrace(0x5000 /* PTRACE_??? */, 22210, 0x3ffffdb14c0, 0x1) = 0
ptrace(0x5001 /* PTRACE_??? */, 22210, 0x3ffffdb14c0, 0xbc1cbf28) = -1 EINVAL
(Invalid argument)
Couldn't write registers: Invalid argument.
Target is executing.
ptrace(PTRACE_KILL, 22210, 0, 0)        = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_KILL, 22210, 0, 0)        = -1 ESRCH (No such process)
(sid_s390x-dchroot)sbronson@zelenka:~/strace-code$ gdb --version
GNU gdb (GDB) 7.6.1 (Debian 7.6.1-1)
.
.
.

(The failing request is a PTRACE_POKEUSR_AREA request.)

The kernel package can be obtained from:
http://snapshot.debian.org/package/linux/3.2.51-1/#linux-image-3.2.0-4-s390x_3.2.51-1

(In this case, since the outer system is running the s390 arch, it came from
the _s390.deb)

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