[Bug record/30075] [intel Performance-core] FAIL: gdb.python/py-record-btrace.exp: prepare record: python insn = r.instruction_history

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30075

--- Comment #10 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5bed9dc992a0136d403a7addb29a2ed822fd4fd2

commit 5bed9dc992a0136d403a7addb29a2ed822fd4fd2
Author: Tom de Vries <tdevries@suse.de>
Date:   Tue Feb 14 13:15:49 2023 +0100

    [gdb/testsuite] Add xfail in gdb.python/py-record-btrace.exp

    There's a HW bug affecting Processor Trace on some Intel processors
    (Ice Lake to Raptor Lake microarchitectures).

    The bug was exposed by linux kernel commit 670638477aed
    ("perf/x86/intel/pt: Opportunistically use single range output mode"),
    added in version v5.5.0, and was worked around by commit ce0d998be927
    ("perf/x86/intel/pt: Fix sampling using single range output") in version
    6.1.0.

    The bug manifests (on a Performance-core of an i7-1250U, an Alder Lake cpu)
in
    a single test-case:
    ...
    (gdb) python insn = r.instruction_history^M
    warning: Decode error (-20) at instruction 33 (offset = 0x3d6a, \
      pc = 0x400501): compressed return without call.^M
    (gdb) FAIL: gdb.python/py-record-btrace.exp: prepare record: \
      python insn = r.instruction_history
    ...

    Add a corresponding XFAIL.

    Note that the i7-1250U has both Performance-cores and Efficient-cores, and
on
    an Efficient-Core the test-case runs without any problems, so if the
testsuite
    run is not pinned to a specific cpu, the test may either PASS or XFAIL.

    Tested on x86_64-linux:
    - openSUSE Leap 15.4 with linux kernel version 5.14.21
    - openSUSE Tumbleweed with linux kernel version 6.1.8

    PR testsuite/30075
    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30075

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