Sounds like it is a problem with hwloc?

I think you can disable hwloc with this line in prime.txt, maybe you can check if that helps?
EnableSetAffinity=0

I'm at work now so it will be some time before I can do any follow up testing. It seems to get past hwloc ok, and the crash happens when running the fft. I guess the question now is, what is different about running 4c4w than 8c 1,2,8w?

Forgot to say, I quickly tried same on a 6700k at 4c4w, ran normally without problem.

Edit: didn't think at the time, wonder if 8 cores, 4 workers would work...

Does not sound like an hwloc problem.

To recap and cover new testing:

Prime95 29.8b5
Windows 10 64-bit (probably all on 1903)
4800k FFT throughput benchmark

3700X (Zen 2, 8 cores)
8 cores 1, 2, 4, 8 workers: ok
4 cores, 4 workers: crashes

3600 (Zen 2, 6 cores)
6 cores, 1, 2, 6 workers: ok
4 cores, 4 workers: crashes

6700k (Skylake 4 cores)
4 cores, 4 workers: ok

8086k (Coffee Lake 6 cores)
6 cores, 1, 6 workers: ok
4 cores, 4 workers: ok

I can't easily test older Ryzen generations as I dropped the new CPUs into the systems that had them.

Is this issue 100% reproducible?

[QUOTE=ixfd64;522529]Is this issue 100% reproducible?[/QUOTE]

Probably. It has affected 2 different users - both Windows.

Does it happen under Linux? Any chance either Evil Genius or mackerel could load Linux in a VM and try mprime?

I have it running in the Linux subsystem. What parameters do you want me to use with mprime?

[QUOTE=ixfd64;522529]Is this issue 100% reproducible?[/QUOTE]


Yes. I'm just one of the early adopters.

[QUOTE=Evil Genius;522537]I have it running in the Linux subsystem. What parameters do you want me to use with mprime?[/QUOTE]

./mprime -m

Then choose Benchmark and the same options you used under Windows.

[CODE][Mon Jul 29 22:46:46 2019]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
AMD Ryzen 7 3700X 8-Core Processor
CPU speed: 4281.77 MHz, 8 hyperthreaded cores
CPU features: 3DNow! Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA
L1 cache size: 8x32 KB, L2 cache size: 512 KB, L3 cache size: 32 MB
L1 cache line size: 64 bytes, L2 cache line size: 64 bytes
Machine topology as determined by hwloc library:
Machine#0 (total=16706384KB, Backend=Linux, OSName=Linux, OSRelease=4.4.0-18362-Microsoft, OSVersion="#1-Microsoft Mon Mar 18 12:02:00 PST 2019", HostName=zenstation, Architecture=x86_64, hwlocVersion=2.0.3, ProcessName=mprime)
Package#0 (total=16706384KB, CPUVendor=AuthenticAMD, CPUFamilyNumber=23, CPUModelNumber=113, CPUModel="AMD Ryzen 7 3700X 8-Core Processor ", CPUStepping=0)
Core#0 (cpuset: 0x00000003)
PU#0 (cpuset: 0x00000001)
PU#1 (cpuset: 0x00000002)
Core#1 (cpuset: 0x0000000c)
PU#2 (cpuset: 0x00000004)
PU#3 (cpuset: 0x00000008)
Core#2 (cpuset: 0x00000030)
PU#4 (cpuset: 0x00000010)
PU#5 (cpuset: 0x00000020)
Core#3 (cpuset: 0x000000c0)
PU#6 (cpuset: 0x00000040)
PU#7 (cpuset: 0x00000080)
Core#4 (cpuset: 0x00000300)
PU#8 (cpuset: 0x00000100)
PU#9 (cpuset: 0x00000200)
Core#5 (cpuset: 0x00000c00)
PU#10 (cpuset: 0x00000400)
PU#11 (cpuset: 0x00000800)
Core#6 (cpuset: 0x00003000)
PU#12 (cpuset: 0x00001000)
PU#13 (cpuset: 0x00002000)
Core#7 (cpuset: 0x0000c000)
PU#14 (cpuset: 0x00004000)
PU#15 (cpuset: 0x00008000)
Prime95 64-bit version 29.8, RdtscTiming=1
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=384, Pass2=12800, clm=4 (4 cores, 4 workers): 23.54, 23.94, 23.82, 23.91 ms. Throughput: 168.08 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=384, Pass2=12800, clm=2 (4 cores, 4 workers): 24.53, 24.65, 24.51, 24.55 ms. Throughput: 162.87 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=384, Pass2=12800, clm=1 (4 cores, 4 workers): 25.53, 25.51, 25.21, 25.63 ms. Throughput: 157.05 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=640, Pass2=7680, clm=4 (4 cores, 4 workers): 23.93, 23.73, 23.92, 23.51 ms. Throughput: 168.28 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=640, Pass2=7680, clm=2 (4 cores, 4 workers): 24.26, 24.22, 24.41, 24.42 ms. Throughput: 164.43 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=640, Pass2=7680, clm=1 (4 cores, 4 workers): 25.18, 25.28, 25.16, 25.14 ms. Throughput: 158.79 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=768, Pass2=6400, clm=4 (4 cores, 4 workers): 24.01, 23.44, 23.92, 23.89 ms. Throughput: 167.98 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=768, Pass2=6400, clm=2 (4 cores, 4 workers): 24.36, 24.35, 24.40, 24.46 ms. Throughput: 163.99 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=768, Pass2=6400, clm=1 (4 cores, 4 workers): 25.19, 24.74, 24.78, 25.21 ms. Throughput: 160.14 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=1280, Pass2=3840, clm=4 (4 cores, 4 workers): 24.02, 23.44, 23.37, 23.29 ms. Throughput: 170.01 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=1280, Pass2=3840, clm=2 (4 cores, 4 workers): 24.11, 24.07, 24.09, 24.25 ms. Throughput: 165.77 iter/sec.
FFTlen=4800K all-complex, Type=3, Arch=4, Pass1=1280, Pass2=3840, clm=1 (4 cores, 4 workers): 24.56, 24.70, 24.68, 24.63 ms. Throughput: 162.31 iter/sec.[/CODE]


mprime did not crash

Do not run the all-complex FFTs. The crashes were with that checkbox off.