[Bug breakpoints/26873] New: [ppc64] gdb/infrun.c:2529: internal-error: void resume_1(gdb_signal): Assertion `!(thread_has_single_step_breakpoints_set (tp) && step)' failed

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26873

            Bug ID: 26873
           Summary: [ppc64] gdb/infrun.c:2529: internal-error: void
                    resume_1(gdb_signal): Assertion
                    `!(thread_has_single_step_breakpoints_set (tp) &&
                    step)' failed
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Consider the test-case gdb.threads/watchthreads-threaded.exp from
https://src.fedoraproject.org/rpms/gdb/blob/master/f/gdb-6.3-threaded-watchpoints2-20050225.patch
.

On ppc64 and ppc64le, on Factory, we run into:
...
Old value = 1^M
New value = 2^M
thread_function (arg=0x2) at watchthreads-threaded.c:61^M
61              (*myp) ++; usleep (1); /* Loop increment.  */^M
(gdb) continue^M
Continuing.^M
../../gdb/infrun.c:2529: internal-error: void resume_1(gdb_signal): Assertion
`!(thread_has_single_step_breakpoints_set (tp) && step)' failed.^M
A problem internal to GDB has been detected,^M
further debugging may prove unreliable.^M
Quit this debugging session? (y or n)
FAIL: gdb.threads/watchthreads-threaded.exp: threaded watch loop (GDB internal
error)
...

This was using an opensuse package build & test on obs, using 10.1 sources and
fedora patches.  There's nothing powerpc-specific in the fedora patch set, so
I'm assuming this can be reproduced with trunk as well.

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