[mpich-discuss] mpich/master: Something got wrong since may 24

[Eric Chamberland]

Hi,

I have worked to reproduce the bug in a somewhat small example.

On on any good MPI version, the output of the attached example is:

Rank 1: Element # 33 : {40,106,105,204,208,200},8
Rank 1: Element # 34 : {61,105,106,201,208,205},8
Rank 1: Element # 35 : {40,105,107,200,212,209},8
Rank 1: Element # 36 : {62,107,105,210,212,202},8
Rank 1: Element # 37 : {40,108,106,213,216,204},8
Rank 1: Element # 38 : {42,110,85,223,227,108},8

On the mpich/master branch, since may 24,
commit 60035bb7b9766db15041033959e4209f0ad936b,
  the output is:

Rank 1: Element # 33 : {40,106,105,204,208,200},8
Rank 1: Element # 34 : {52,76,104,74,197,195},8
Rank 1: Element # 35 : {62,105,65,202,203,40},8
Rank 1: Element # 36 : {63,66,106,41,207,206},8
Rank 1: Element # 37 : {40,106,105,204,208,200},8
Rank 1: Element # 38 : {42,110,85,223,227,108},8

I hope you wil be able to work with my example to reproduce and solve 
this problem!

Compile & run with:

  mpic++ -o bugmaster mpich_bug_indexed_type.cc
  mpirun -n 2 bugmaster

Thanks a lot,

Eric

Le 2019-06-05 à 9:18 a.m., Eric Chamberland via discuss a écrit :
> Hi,
> 
> I am in the early debugging stages of something that broke on may 24 on 
> our test database with 17 tests against mpich/master branch.
> 
> It seems related to MPI I/O, since we have observed the bugs just after 
> MPI I/O reads.
> 
> Everything is fine with other MPI libs, even older mpich.  This is only 
> a mpich/master problem.
> 
> My early query: am I alone to have observed this?
> 
> Thanks,
> 
> Eric
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