When the libopenblas-base package is installed, using the plot function in octave causes a crash For example, when running plot(1) Octave reports ``` panic: Illegal instruction -- stopping myself... attempting to save variables to 'octave-workspace'... save to 'octave-workspace' complete Illegal instruction ``` Using GDB to debug, it reports ``` Program received signal SIGILL, Illegal instruction. 0x00007fffed1c3220 in dgemm_otcopy_OPTERON_SSE3 () from /usr/lib/libopenblas.so.0 ``` Getting more info ``` (gdb) info line *0x00007fffed1c3220 No line number information available for address 0x7fffed1c3220 ``` Disassembling the code, ``` (gdb) disassemble /r 0x00007fffed1c3200,+36 Dump of assembler code from 0x7fffed1c3200 to 0x7fffed1c3224: 0x00007fffed1c3200 : 41 57 push %r15 0x00007fffed1c3202 : 41 56 push %r14 0x00007fffed1c3204 : 41 55 push %r13 0x00007fffed1c3206 : 41 54 push %r12 0x00007fffed1c3208 : 55 push %rbp 0x00007fffed1c3209 : 53 push %rbx 0x00007fffed1c320a : 48 89 f0 mov %rsi,%rax 0x00007fffed1c320d : 48 89 f3 mov %rsi,%rbx 0x00007fffed1c3210 : 48 83 e0 fc and $0xfffffffffffffffc,%rax 0x00007fffed1c3214 : 48 83 e3 fe and $0xfffffffffffffffe,%rbx 0x00007fffed1c3218 : 48 0f af c7 imul %rdi,%rax 0x00007fffed1c321c : 48 0f af df imul %rdi,%rbx => 0x00007fffed1c3220 : 0f 0e femms 0x00007fffed1c3222 : 4d 8d 2c c0 lea (%r8,%rax,8),%r13 End of assembler dump. ``` It seems the problem is with the FEMMS instruction. I am running this on an AMD Opteron 23xx, which should have the 3dnow! extensions, but I do not see it in cpuinfo ``` processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 6 model name : AMD Opteron 23xx (Gen 3 Class Opteron) stepping : 1 microcode : 0x1000065 cpu MHz : 2299.998 cache size : 512 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl extd_apicid pni cx16 x2apic popcnt hypervisor abm sse4a misalignsse 3dnowprefetch vmmcall bugs : fxsave_leak sysret_ss_attrs bogomips : 4599.99 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ```

When	Who	Action	New State
2016-02-21	Launchpad Janitor	Expire	Expired
2017-06-15	Radoslav Neychev	Comment	Expired

Ubuntuopenblas package

History of question #284671

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openblas package