Bug 1507744

Summary: Octave is linked against multiple blas packages
Product: [Fedora] Fedora Reporter: Dmitri A. Sergatskov <dasergatskov>
Component: octaveAssignee: Orion Poplawski <orion>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: unspecified    
Version: 27CC: alexl, cbm, cse.cem+redhatbugz, fkluknav, jaromir.capik, orion, rakesh.pandit, susi.lehtola
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Hardware: x86_64   
OS: Linux   
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Last Closed: 2018-11-30 21:50:34 UTC Type: Bug
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Description Flags
gdb backtrace none

Description Dmitri A. Sergatskov 2017-10-31 04:27:28 UTC
Created attachment 1345698 [details]
gdb backtrace

Description of problem:
openblas-0.2.20-3 broke "make check" during octave build. 

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. get octave development sourse
2. build it againt openblas
3. run "make check"

Actual results:
make check will hang with an octave process running at 100% CPU load
during "classes.tst" test.

Expected results:
It should pass

Additional info:
Building against reference blas, or atlas, or self-compiled openblas-0.2.2 from upstream tar ball all work fine. I assume the previous rpm (0.2.20-2) would work
as well since I noticed the problem soon after the update.

This affects Fedora 27/26 and EPEL 7.

A backtrace of gdb attached to the hanged octave process is attached. 
It appears that it hangs in dgemm. Unfortunately I cannot provide a simple 
test case at this moment.


Comment 1 Susi Lehtola 2017-10-31 06:35:00 UTC
The backtrace doesn't show any info about what is crashing. Please install openblas-debuginfo.

Comment 2 Dmitri A. Sergatskov 2017-10-31 14:33:27 UTC
It is not crashing, it is in the infinite loop.

Comment 3 Susi Lehtola 2017-10-31 15:40:33 UTC
Stable Octave builds and passes test suite fine with openblas-0.2.0-3.


Please test with an older version of openblas.

Comment 4 Dmitri A. Sergatskov 2017-10-31 16:55:42 UTC
The bug is obscure. Octave links some other libraries which in turnm linked to different blas(es) so it possible that 4.2.1 gets to use different dgemm.

 ldd /usr/bin/octave-cli | grep blas
	libopenblas.so.0 => /lib64/libopenblas.so.0 (0x00007f0c41879000)
	 ldd /usr/bin/octave-cli | grep blas
	libopenblas.so.0 => /lib64/libopenblas.so.0 (0x00007f0c41879000)
	libopenblasp.so.0 => /lib64/libopenblasp.so.0 (0x00007f0c39aa6000)
        libopenblasp.so.0 => /lib64/libopenblasp.so.0 (0x00007f0c39aa6000)

ldd /usr/bin/octave-cli | grep atlas
	libsatlas.so.3 => /usr/lib64/atlas/libsatlas.so.3 (0x00007f48b2d6f000)

Anyway, the trace with debug symbols (just top lines):

#0  dgemm_ (TRANSA=<optimized out>, TRANSB=<optimized out>, M=<optimized out>, N=<optimized out>, K=<optimized out>, alpha=<optimized out>, a=0x139b5f0, ldA=0x7ffffcdb0f68, b=0x654f540, ldB=0x7ffffcdb0f60, 
    beta=0x7ffffcdb1068, c=0x2e6d5e0, ldC=0x7ffffcdb0f7c) at gemm.c:403
#1  0x00007f4cf770dc9c in xgemm (a=..., b=..., transa=blas_no_trans, transb=blas_no_trans) at ../liboctave/array/dMatrix.cc:3008
#2  0x00007f4cf770dd70 in operator* (a=..., b=...) at ../liboctave/array/dMatrix.cc:3023
#3  0x00007f4cf887311c in oct_binop_mul (a1=..., a2=...) at ../libinterp/operators/op-m-m.cc:63
#4  0x00007f4cf8b289b7 in do_binary_op (op=octave_value::op_mul, v1=..., v2=...) at ../libinterp/octave-value/ov.cc:2186


Comment 5 Dmitri A. Sergatskov 2017-10-31 18:24:46 UTC
Also, using
libopenblaso.so (from 0.2.20-3) -- passes
libopenblasp.so                 -- hangs
libopenblas.so (default)        -- hangs

may be that give some additional clues...

Also all my computers are fairly old (i7-2600k perhaps is the newest), perhaps
it would work on a newer cpus...


Comment 6 Susi Lehtola 2017-10-31 19:52:39 UTC
Not surprising: libopenblas, libopenblasp and libopenblaso all provide the same symbols, but are different libraries. It's even worse if you're also linking to some other library.

This is clearly a bug, but not in OpenBLAS. Reassigning to Octave.

I can see on my Fedora 26 computer with

$ rpm -q octave

that the linkage is all around the place

$ ldd /usr/bin/octave-cli|grep -i atla
	libtatlas.so.3 => /usr/lib64/atlas/libtatlas.so.3 (0x00007fd1b45ab000)
	libsatlas.so.3 => /usr/lib64/atlas/libsatlas.so.3 (0x00007fd1acd11000)
$ ldd /usr/bin/octave-cli|grep -i blas
	libblas.so.3 => /lib64/libblas.so.3 (0x00007fcca3aab000)
$ ldd /usr/bin/octave-cli|grep -i lapack
	liblapack.so.3 => /lib64/liblapack.so.3 (0x00007f266d0c3000)

It's not linking to two, but three(!) mutually incompatible implementations: sequential ATLAS, threaded ATLAS, as well as reference BLAS and LAPACK, all of which supply the same symbols. I'm afraid even to look at what the libraries that are linked to Octave are using, since they will further confuse the mess.

Comment 7 Dmitri A. Sergatskov 2017-10-31 20:38:50 UTC
Why do you think they are mutually incompatible implementations?
In fact you can link octave against e,g, reference blas and then override
it with LD_PRELOAD=/your/optimized/blas/library.so method.


Comment 8 Susi Lehtola 2017-11-01 06:17:06 UTC
(In reply to Dmitri A. Sergatskov from comment #7)
> Why do you think they are mutually incompatible implementations?
> In fact you can link octave against e,g, reference blas and then override
> it with LD_PRELOAD=/your/optimized/blas/library.so method.

That's my experience. If you link to multiple libraries that provide the same symbols, you'll get weird behavior and crashes.

Comment 9 Ben Cotton 2018-11-27 15:19:02 UTC
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Comment 10 Ben Cotton 2018-11-30 21:50:34 UTC
Fedora 27 changed to end-of-life (EOL) status on 2018-11-30. Fedora 27 is
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