[Octave-bug-tracker] [bug #58375] Function eig(A, B) stops when A and B are random symmetrical matrices

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?58375>

                 Summary: Function eig(A, B) stops when A and B are random
symmetrical matrices
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 15 May 2020 07:14:49 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: Daniel Mårtensson
        Originator Email: address@hidden
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

Function eig(A, B) stops when A and B are random symmetrical matrices.

How to reproduce the error:

>> A = randn(10, 10);
>> A = A'*A; % Symmetrical
>> B = randn(10, 10);
>> B = B'*B; % Symmetrical
>> [V, D] = eig(A, B)


Now it will stop. You have to force-close GNU Octave.

Operative system: Lubuntu Linux 20.04
Computer: HP Workstation Z400
Linux kernel: 5.4.0-29-generic

hp@hp-hpz400workstation:~$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           W3503  @ 2.40GHz
stepping        : 5
microcode       : 0x1d
cpu MHz         : 2400.255
cache size      : 4096 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ht tm pbe syscall nx rdtscp
lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
cpuid aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm
dca sse4_1 sse4_2 popcnt lahf_lm pti ssbd ibrs ibpb stibp tpr_shadow vnmi
flexpriority ept vpid dtherm flush_l1d
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
mds swapgs itlb_multihit
bogomips        : 4800.53
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           W3503  @ 2.40GHz
stepping        : 5
microcode       : 0x1d
cpu MHz         : 2400.266
cache size      : 4096 KB
physical id     : 0
siblings        : 2
core id         : 2
cpu cores       : 2
apicid          : 4
initial apicid  : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ht tm pbe syscall nx rdtscp
lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
cpuid aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm
dca sse4_1 sse4_2 popcnt lahf_lm pti ssbd ibrs ibpb stibp tpr_shadow vnmi
flexpriority ept vpid dtherm flush_l1d
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
mds swapgs itlb_multihit
bogomips        : 4800.53
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

Octave installed with "sudo apt-get install octave" command.





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