Illegal instruction with all CPU miners

Tech Support
1

When I try to mine with grin-miner against locally running grin:

$ gdb --args target/debug/grin-miner

I get:

…
Starting Grin-Miner from config file at: …/grin-miner/grin-miner.toml
Thread 5 “mining_controll” received signal SIGILL, Illegal instruction.
[Switching to Thread 0x7ffff6844700 (LWP 5555)]
deviceInfo::deviceInfo (this=0x7ffff5c9f2a0 <DEVICE_INFO>)
at …/.cargo/git/checkouts/cuckoo-miner-4752934f0f1f2bfe/eb084b7/src/cuckoo_sys/plugins/cuckoo/src/cuckoo_miner/cuckoo_miner.h:171
171 last_start_time=0;
Missing separate debuginfos, use: dnf debuginfo-install libgcc-7.3.1-2.fc26.x86_64 libstdc+±7.3.1-2.fc26.x86_64 ncurses-libs-6.0-8.20170212.fc26.x86_64

This happens with lean_cpu, mean_compat_cpu and mean_cpu. Line 171 above is first one to assign a value to a u64 variable in contructor if I’m reading it correctly. Last thing printed to logfile with trace output is:
Jun 03 15:44:53.097 INFO Got a job at height 96494 and difficulty 1
Jun 03 15:44:53.196 DEBG Miner received message: ReceivedJob(96494, 1, “000100000000000178ee488863f0f0898294ed619a13dd8bbf0a7f9bd42fde967f8e721ecaa8b2cb20d7000000005b13e2c30000000000020564eca708cefb8981b25b7ce76aab1b130f614dfd93d5eee0e6bd93a1630465dc2c6a89811053b29f797382b5d6e93d9af2e38521f248b122e33ce041868e6c297fac249f77d387ce6cf0f4fc70f73d55bf4adaf20a8b6f2a19a0b4ad1873aab0794946e2d45f707ea30dcba46b71e1aa10c45ef84127f3af4bd53a46773d2e65f0”)
Jun 03 15:44:53.196 DEBG Mining Cuckoo30 for height: 96494

What should I do? Thanks

Edit: /proc/cpuinfo starts as:
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 10
model name : AMD Phenom™ II X6 1075T Processor
stepping : 0
microcode : 0x10000dc
cpu MHz : 1003.970
cache size : 512 KB
physical id : 0
siblings : 6
core id : 0
cpu cores : 6
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb hw_pstate vmmcall npt lbrv svm_lock nrip_save pausefilter
bugs : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs null_seg amd_e400 spectre_v1 spectre_v2
bogomips : 5999.99
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb

2

Can you build the solver from https://github.com/tromp/cuckoo ?

I suspect the issue might be the non-SSE2 intrinsic instruction _mm_extract_epi64, for example https://github.com/tromp/cuckoo/blob/master/src/mean_miner.hpp#L422

3

it’s not an SSE2 issue, since it also happens on mean_compat_cpu.
Line 171 of cuckoo_miner.h is the assignment to last_start_time in

deviceInfo::deviceInfo(){
device_id=0;
is_busy=false;
last_start_time=0;

Could this be an issue with a u64 that’s not aligned on an 8 byte boundary?

4

I also get illegal instruction from mean30x8 of tromp/cuckoo.

Edit: illegal instruction from all leans except lean20 and all means, but not from simple4.

5

Moving all u64s to front of deviceinfo class didn’t help, same problem at line 171.

6

x8 needs AVX-2. Try the x1 variants. Could it be you don’t have enough memory?

7

x1 variants aren’t built apparently, but they do work. Total mem is 16 GB which seems enough.

8

Is there a way to force cargo build to include e.g. -mtune=native flag when eventually calling gcc? Or are some instructions forced even on hardware that doesn’t support them? I’ve probably had similar problems with blake2 before…

9

I imagine you could look into https://github.com/mimblewimble/cuckoo-miner/blob/master/src/cuckoo_sys/plugins/CMakeLists.txt for what flags are used to build the binary, but I’m not familiar with cargo/rust build chain…

10

Switching to march=x86-64 from march=native changes the location of illegal instruction to:
Thread 5 “mining_controll” received signal SIGILL, Illegal instruction.
[Switching to Thread 0x7ffff6844700 (LWP 21758)]
0x00007ffff5a91ec8 in cuckoo_init ()
at …/.cargo/git/checkouts/cuckoo-miner-4752934f0f1f2bfe/eb084b7/src/cuckoo_sys/plugins/cuckoo/src/cuckoo_miner/mean_miner_adds.h:43
43 strcpy(num_trims_prop.description,“The maximum number of trim rounds to perform (will be rounded to be even)\0”);

11

Switching from march=native to mtune=x86-64 makes mean_compat_cpu and lean_cpu work, mean_cpu still gives illegal instruction. Thanks!

12

Good job. mean_cpu requires AVX-2 instructions that are supported by Intel Haswell and later architectures.

13

You see, Ivan, when commit illegal instruction, computer go to jail.