[Bug gdb/28275] commit_resumed_state assertion failure when killing running inferior and running again

["andrew.burgess at embecosm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28275

Andrew Burgess <andrew.burgess at embecosm dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |andrew.burgess at embecosm dot com

--- Comment #1 from Andrew Burgess <andrew.burgess at embecosm dot com> ---
Created attachment 13630
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13630&action=edit
Patch to add a related issue into the testsuite.

I ran into the same assertion while debugging some other issue.  My steps to
reproduce are slightly different, but I thought I'd add the details here as it
feels like these two cases must be related:

  $ /tmp/gdb/testsuite/outputs/gdb.threads/detach-step-over/detach-step-over
  $ gdb
  (gdb) attach 608289
  Attaching to program:
/tmp/gdb/testsuite/outputs/gdb.threads/detach-step-over/detach-step-over,
process 608289
  ... snip ...
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib64/libthread_db.so.1".
  0x00007f84068f4215 in nanosleep () from /lib64/libc.so.6
  (gdb) break detach-step-over.c:54 if 0
  Breakpoint 1 at 0x40119c: file
/tmp/gdb/testsuite/../../../src/gdb/testsuite/gdb.threads/detach-step-over.c,
line 54.
  (gdb) continue &
  Continuing.
  (gdb) q
  A debugging session is active.

        Inferior 1 [process 608289] will be detached.

  Quit anyway? (y or n) y
  ../../src/gdb/target.c:3778: internal-error: void target_stop(ptid_t):
Assertion `!proc_target->commit_resumed_state' failed.

The patch I've attached modifies gdb.threads/detach-step-over.exp to show this
bug, this patch isn't ready to upstream in its current state.

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