[Bug record/30073] New: [intel Efficient-core] FAIL: gdb.btrace/exception.exp: flat (pattern 1)

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30073

            Bug ID: 30073
           Summary: [intel Efficient-core] FAIL: gdb.btrace/exception.exp:
                    flat (pattern 1)
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: record
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

I got a new laptop, build gdb and ran the gdb testsuite, and ran into:
...
(gdb) PASS: gdb.btrace/exception.exp: continue to breakpoint: cont to bp.2
gdb_expect_list pattern: /1     main\(\)^M
2       test\(\)^M
3       foo\(\)^M
4       bar\(\)^M
5       bad\(\)^M/
record function-call-history 1^M
1       main()^M
(gdb) FAIL: gdb.btrace/exception.exp: flat (pattern 1)
...

I could reproduce it sometimes, but not all the time, till I tried out using
taskset.

When using:
- taskset -c 0-3, the test-case passes.  
- taskset -c 4-11, the test-case fails.

The processor is a i7-1250U with 12 threads:
- 2 performance cores (I guess providing 2 threads per core), and
- 8 efficient cores.

So, I guess somehow it doesn't run properly on efficient cores.

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