[Bug tdep/16940] New: S390: 64-bit GDB can't debug multithreaded 31-bit inferior

["arnez at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16940

            Bug ID: 16940
           Summary: S390: 64-bit GDB can't debug multithreaded 31-bit
                    inferior
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: arnez at linux dot vnet.ibm.com

When debugging a multithreaded 31-bit inferior (compiled with "gcc -m31
-lpthread), a 64-bit gdb usually crashes like this:

(gdb) run
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7d68cb80 (LWP 21445)]
warning: Can't attach LWP -844998064: No child processes
linux-thread-db.c:434: internal-error: thread_get_info_callback: Assertion
`inout->thread_info != NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) 

This is caused by a bad offset in fill_gregset() since commit
2ccd146855365598ad2644ef8139f2f2a6747b90
(https://sourceware.org/ml/gdb-patches/2013-09/msg00355.html).

The same bug also causes failures with inferior function calls.

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