[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:

> AMD64 RHEL8 LTO 3.x is green again. I will keep the issue open until all 
> mentionned buildbots are back to green (when test_gdb pass on these workers).

I checked an all buildbots mentioned in this issues are back to green 
(success). I close the issue.


> AMD64 RHEL8 LTO 3.x:
> https://buildbot.python.org/all/#/builders/312/builds/4

Green

> AMD64 RHEL8 LTO + PGO 3.7:
> https://buildbot.python.org/all/#/builders/255/builds/13

Green

> AMD64 RHEL8 LTO 3.7:
> https://buildbot.python.org/all/#/builders/293/builds/13

Green

> AMD64 RHEL8 LTO 3.8:
> https://buildbot.python.org/all/#/builders/265/builds/12

Green

> Similar issue on AMD64 Fedora Stable LTO 3.8:
> https://buildbot.python.org/all/#/builders/235/builds/2

Green

> AMD64 Fedora Stable LTO + PGO 3.7 is also affected:
> https://buildbot.python.org/all/#/builders/252/builds/2

Green

> And AMD64 Fedora Stable LTO 3.7:
> https://buildbot.python.org/all/#/builders/270/builds/2

Green

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:

AMD64 RHEL8 LTO 3.x is green again. I will keep the issue open until all 
mentionned buildbots are back to green (when test_gdb pass on these workers).

--

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:


New changeset e6b5ed1fbdbb7b44c7ab2a353fa0bc726b073740 by Victor Stinner in 
branch '3.7':
bpo-38239: Fix test_gdb for Link Time Optimization (LTO) (GH-16422) (GH-16426)
https://github.com/python/cpython/commit/e6b5ed1fbdbb7b44c7ab2a353fa0bc726b073740


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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[miss-islington]

miss-islington  added the comment:


New changeset c9893400652f38804aed0be8d8f70feda9465c47 by Miss Islington (bot) 
in branch '3.8':
bpo-38239: Fix test_gdb for Link Time Optimization (LTO) (GH-16422)
https://github.com/python/cpython/commit/c9893400652f38804aed0be8d8f70feda9465c47


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nosy: +miss-islington

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:

Python 2.7 doesn't seem to be affected: I failed to reproduce the test_gdb 
failure on Python 2.7 with LTO.

--
versions: +Python 3.7, Python 3.8

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

Change by STINNER Victor :


--
pull_requests: +16005
pull_request: https://github.com/python/cpython/pull/16426

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 64b4a3a2deabcd4103fac2759a311fe94159b4d1 by Victor Stinner in 
branch 'master':
bpo-38239: Fix test_gdb for Link Time Optimization (LTO) (GH-16422)
https://github.com/python/cpython/commit/64b4a3a2deabcd4103fac2759a311fe94159b4d1


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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[miss-islington]

Change by miss-islington :


--
pull_requests: +16003
pull_request: https://github.com/python/cpython/pull/16424

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

Change by STINNER Victor :


--
keywords: +patch
pull_requests: +16001
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/16422

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:

> Apparently this no longer works. Who understands these variables enough to 
> fix the issue?

Some failures are LTO + PGO builds, but test_gdb also fails on LTO without PGO 
builds.

The PGO_PROF_USE_FLAG check only checks for PGO.

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[Steve Dower]

Steve Dower  added the comment:

Um, okay then.

The test already includes this:

if ((sysconfig.get_config_var('PGO_PROF_USE_FLAG') or 'xxx') in
(sysconfig.get_config_var('PY_CORE_CFLAGS') or '')):
raise unittest.SkipTest("test_gdb is not reliable on PGO builds")

Apparently this no longer works. Who understands these variables enough to fix 
the issue?

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[Gregory P. Smith]

Change by Gregory P. Smith :


--
nosy:  -gregory.p.smith

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[Gregory P. Smith]

Gregory P. Smith  added the comment:

The test probably has a fragile regex.  I don't spend time with gdb things much 
myself.

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[Charalampos Stratakis]

Change by Charalampos Stratakis :


--
nosy: +cstratak

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[Steve Dower]

Steve Dower  added the comment:

Greg seems to have done LTO related things in the past, maybe he knows? (All my 
PGO contributions only apply to Windows :) )

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nosy: +gregory.p.smith

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:

> builtid_id isn't in longobject.c, so this is incorrect debug information. The 
> test expects to find it in bltinmodule.c:

gdb may be confused by LTO. I'm not sure if how LTO works to debug symbols.

> Shouldn't this test be suppressed on LTO builds?

Maybe. I don't know.

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:

AMD64 Fedora Stable LTO + PGO 3.7 is also affected:
https://buildbot.python.org/all/#/builders/252/builds/2

And AMD64 Fedora Stable LTO 3.7:
https://buildbot.python.org/all/#/builders/270/builds/2

--

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[Steve Dower]

Steve Dower  added the comment:

Shouldn't this test be suppressed on LTO builds?

#0  builtin_id (self=, v=) at 
Objects/longobject.c:1113

builtid_id isn't in longobject.c, so this is incorrect debug information. The 
test expects to find it in bltinmodule.c:

re.match(r'.*#0\s+builtin_id\s+\(self\=.*,\s+v=\s*(.*?)?\)\s+at\s+\S*Python/bltinmodule.c.*'
 ...

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[issue38239] test_gdb fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb output

[STINNER Victor]

STINNER Victor  added the comment:

Similar issue on AMD64 Fedora Stable LTO 3.8:
https://buildbot.python.org/all/#/builders/235/builds/2

--
title: test_gdb fails on AMD64 RHEL8 LTO 3.x: Unexpected gdb output -> test_gdb 
fails on AMD64 Fedora Stable LTO 3.8 and AMD64 RHEL8 LTO 3.x: Unexpected gdb 
output

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