[issue42732] Buildbot s390x Fedora LTO + PGO 3.x fails intermittently

[Ken Jin]

Ken Jin  added the comment:

Oops, you're right! Sorry, I'll close this issue. Anyways I realized I had the 
wrong hunch - I was looking at a different part of the logs.

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resolution:  -> duplicate
stage:  -> resolved
status: open -> closed

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[issue42732] Buildbot s390x Fedora LTO + PGO 3.x fails intermittently

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Isn't this the same as the problem described in 
https://bugs.python.org/issue42164 ?

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[issue42732] Buildbot s390x Fedora LTO + PGO 3.x fails intermittently

[Ken Jin]

New submission from Ken Jin :

Dear core developers, I noticed that for many recent commits, the s390x Fedora 
LTO + PGO 3.x buildbot often fails. Here's an error log::


gcc -pthread   -fno-semantic-interposition -flto -fuse-linker-plugin 
-ffat-lto-objects -flto-partition=none -g  -Xlinker -export-dynamic -o python 
Programs/python.o libpython3.10.a -lcrypt -lpthread -ldl  -lutil -lm   -lm 
gcc -pthread   -fno-semantic-interposition -flto -fuse-linker-plugin 
-ffat-lto-objects -flto-partition=none -g  -Xlinker -export-dynamic -o 
Programs/_testembed Programs/_testembed.o libpython3.10.a -lcrypt -lpthread 
-ldl  -lutil -lm   -lm 
/usr/bin/ld: python.lto.o: in function `run_mod':
/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.lto-pgo/build/Python/pythonrun.c:1230:
 undefined reference to `PyAST_CompileObject'
/usr/bin/ld: python.lto.o: in function `builtin_compile':
/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.lto-pgo/build/Python/bltinmodule.c:808:
 undefined reference to `PyAST_CompileObject'
/usr/bin/ld: python.lto.o: in function `Py_CompileStringObject':
/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.lto-pgo/build/Python/pythonrun.c:1307:
 undefined reference to `PyAST_CompileObject'
/usr/bin/ld: python.lto.o: in function `symtable_lookup':
/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.lto-pgo/build/Python/symtable.c:1004:
 undefined reference to `_Py_Mangle'
/usr/bin/ld: python.lto.o: in function `symtable_record_directive':
/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.lto-pgo/build/Python/symtable.c:1161:
 undefined reference to `_Py_Mangle'
/usr/bin/ld: python.lto.o: in function `type_new':
/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.lto-pgo/build/Objects/typeobject.c:2544:
 undefined reference to `_Py_Mangle'
/usr/bin/ld: python.lto.o: in function `symtable_add_def_helper':
/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.lto-pgo/build/Python/symtable.c:1018:
 undefined reference to `_Py_Mangle'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:592: python] Error 1
make[1]: *** Waiting for unfinished jobs

[.. I truncated the rest]

I have a hunch the error is caused by a lack of the '-fprofile-generate' flag 
for the first two gcc commands. The only issue is that it's sometimes there, 
and sometimes not, and I'm not familiar enough with the buildbot code to find 
out why. Sorry.

Eg. this commit 
https://github.com/python/cpython/commit/cc3467a57b61b0e7ef254b36790a1c44b13f2228
 has s390x Fedora LTO + PGO 3.x succeeding, the 2 gcc lines also have the 
'-fprofile-generate' flag.

This commit 
https://github.com/python/cpython/commit/c6c43b28746b0642cc3c49dd8138b896bed3028f
 has s390x Fedora LTO + PGO 3.x failing, the 2 gcc lines have a blank space in 
place of the '-fprofile-generate' flag.

I could also be completely wrong and off track, so please feel free to correct 
me :), thanks.

--
components: Demos and Tools
messages: 383702
nosy: kj, pablogsal, vstinner, zach.ware
priority: normal
severity: normal
status: open
title: Buildbot s390x Fedora LTO + PGO 3.x fails intermittently
versions: Python 3.10, Python 3.8, Python 3.9

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