Bug#1121932: scalapack: complex number tests xcinv xzinv segfault on s390x: invalid memory reference

[Drew Parsons]

Source: scalapack
Version: 2.2.2-2
Severity: important
X-Debbugs-Cc: debian-s390 at lists.debian.org
User: debian-s390 at lists.debian.org
Usertags: s390x
Control: forwarded -1 https://github.com/Reference-ScaLAPACK/scalapack/issues/150

The debian build of scalapack 2.2.2 has started failing on s390x machines. Build logs can be found at https://buildd.debian.org/status/logs.php?pkg=scalapack&arch=s390x
The most recent failing build log is https://buildd.debian.org/status/fetch.php?pkg=scalapack&arch=s390x&ver=2.2.2-2&stamp=1764761907&raw=0

It is the complex number tests xcinv and xzinv that are failing. A partial backtrace is (for xcinv)

52: WALL    15   3     2     1     0.00     0.00      292.11     2.0    0.01 PASSED
52: WALL    15   4     2     1     0.00     0.00      309.96     2.0    0.01 PASSED
52: WALL    15   5     2     1     0.00     0.00      433.90     2.0    0.01 PASSED
52: ILLEGAL GRID: nprow*npcol =    4. It can be at most   2
52: Bad   grid parameters: going on to next test case.
52: ILLEGAL GRID: nprow*npcol =    4. It can be at most   2
52: Bad   grid parameters: going on to next test case.
52: 
52: A is a Hermitian positive definite matrix.
52: Only the lower triangular part will be referenced.
52: 
52: TIME     N  NB     P     Q Fct Time Inv Time      MFLOPS    Cond   Resid  CHECK
52: ---- ----- --- ----- ----- -------- -------- ----------- ------- ------- ------
52: 
52: 
52: Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
52: 
52: Backtrace for this error:
52: #0  0x3ff99ea36b7 in ???
52: #1  0x3ff99ea2225 in ???
52: #2  0x3ffd28fe4d7 in ???
52: #3  0x3ff99b98150 in ???
52: #4  0x3ff9ac78d5f in pclauu2_
52: 	at ./SRC/pclauu2.f:194
52: #5  0x3ff9ac7919d in pclauum_
52: 	at ./SRC/pclauum.f:190
52: #6  0x3ff9ac8bb77 in pcpotri_
52: 	at ./SRC/pcpotri.f:202
52: #7  0x2aa1510602d in pcinvdriver
52: 	at ./TESTING/LIN/pcinvdriver.f:650
52: #8  0x2aa15101edf in main
52: 	at ./TESTING/LIN/pcinvdriver.f:851
52: 
52: ===================================================================================
52: =   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
52: =   PID 54656 RUNNING AT sbuild
52: =   EXIT CODE: 11
52: =   CLEANING UP REMAINING PROCESSES
52: =   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
52: ===================================================================================
52: YOUR APPLICATION TERMINATED WITH THE EXIT STRING: Segmentation fault (signal 11)
52: This typically refers to a problem with your application.
52: Please see the FAQ page for debugging suggestions
52/85 Test #52: xcinv ............................***Failed    0.04 sec


s390x is a bigendian architecture, which I thought might be condition
triggering the error, except that ppc64, also bigendian, is passing
https://buildd.debian.org/status/fetch.php?pkg=scalapack&arch=ppc64&ver=2.2.2-2&stamp=1762202378&raw=0