[Bug testsuite/29731] New: [gdb/testsuite] FAIL: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: continue until exit (No unwaited-for children left)

[Bug testsuite/29731] New: [gdb/testsuite] FAIL: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: continue until exit (No unwaited-for children left)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29731

            Bug ID: 29731
           Summary: [gdb/testsuite] FAIL: gdb.multi/multi-re-run.exp:
                    re_run_inf=1: iter=1: continue until exit (No
                    unwaited-for children left)
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Created attachment 14420
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14420&action=edit
gdb.log

I build gdb (40f1a1a4564, with some testsuite patches) with -O2, and ran the
testsuite with target board remote-stdio-gdbserver:
...
(gdb) PASS: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: print tls_var
continue^M
Continuing.^M
No unwaited-for children left.^M
(gdb) FAIL: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: continue until
exit
...

AFAICT, this is a duplicate of PR18717.

As for the test-case patches, the only change impacting this test-case and
target board, is switching from ssh -T to ssh -t in remote-stdio-gdbserver.exp,
which I don't think is related to the FAIL.

I suppose we need to KFAIL this, but I haven't managed to reproduce it yet,
which makes the KFAIL hard to test.

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