Wait! this is not Ryzen bug, but Qemu bug...

ermine-cause-crash.log

[    0.058632] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.075999] raid6: sse2x1   gen()  9820 MB/s
[    0.092999] raid6: sse2x1   xor()  7681 MB/s
[    0.110000] raid6: sse2x2   gen() 12304 MB/s
[    0.126999] raid6: sse2x2   xor()  8460 MB/s
[    0.143999] raid6: sse2x4   gen() 14363 MB/s
[    0.161000] raid6: sse2x4   xor() 10099 MB/s
[    0.162003] invalid opcode: 0000 [#1] SMP
[    0.162310] Modules linked in:
[    0.162549] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.11.0-rc6+ #1
[    0.163050] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-1.fc25 04/01/2014
[    0.163726] task: ffff880007150000 task.stack: ffffc9000003c000
[    0.164185] RIP: 0010:raid6_avx21_gen_syndrome+0x3d/0x120
[    0.164599] RSP: 0000:ffffc9000003fd88 EFLAGS: 00010246
[    0.165025] RAX: 0000000000000000 RBX: ffffc9000003fdd8 RCX: 00000000fffb6cbf
[    0.165586] RDX: 0000000000000080 RSI: 0000000000001000 RDI: 0000000000000012
[    0.166138] RBP: ffffc9000003fdb8 R08: ffffffff8165d8e0 R09: 000000000000009e
[    0.166676] R10: 00000000fffb6cae R11: 73203a3664696172 R12: 0000000000001000
[    0.167219] R13: ffff8800071fa000 R14: ffff8800071fb000 R15: 0000000000000012
[    0.167763] FS:  0000000000000000(0000) GS:ffff880007c00000(0000) knlGS:0000000000000000
[    0.168376] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.168811] CR2: 0000000000000000 CR3: 000000000180a000 CR4: 00000000001006b0
[    0.169352] Call Trace:
[    0.169546]  raid6_select_algo+0x105/0x2ee
[    0.169885]  ? prandom_init+0xcc/0xcc
[    0.170167]  ? set_debug_rodata+0x12/0x12
[    0.170472]  do_one_initcall+0x43/0x180
[    0.170764]  ? set_debug_rodata+0x12/0x12
[    0.171073]  kernel_init_freeable+0x16d/0x1f0
[    0.171468]  ? rest_init+0x80/0x80
[    0.171729]  kernel_init+0xe/0x100
[    0.171994]  ret_from_fork+0x2c/0x40
[    0.172271] Code: 55 41 54 53 48 89 d3 48 8d 14 c5 00 00 00 00 41 89 ff 49 89 f4 48 83 ec 08 4c 8b 2c c3 4c 8b 74 13 08 48 89 55 d0 e8 83 d8 c8 ff <c5> fd 6f 05 db 67 2c 00 c5 e5 ef db 4d 85 e4 48 8b 55 d0 0f 84 
[    0.173735] RIP: raid6_avx21_gen_syndrome+0x3d/0x120 RSP: ffffc9000003fd88
[    0.174269] ---[ end trace 4897c5bbc6c24c57 ]---
[    0.174681] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    0.174681] 
[    0.175405] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    0.175405]