x86_64 architecture crash

03-29 11:22:15.067 I/crash_dump64(27296): performing dump of process 11466 (target tid = 11570)
03-29 11:22:15.068 F/DEBUG (27296): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
03-29 11:22:15.068 F/DEBUG (27296): Build fingerprint: 'harman/fca_dv2/fca_dv2:8.1.0/OPM1.171019.025/FCA-MY21.R17.89:user/release-keys'
03-29 11:22:15.068 F/DEBUG (27296): Revision: '0'
03-29 11:22:15.068 F/DEBUG (27296): ABI: 'x86_64'
03-29 11:22:15.068 F/DEBUG (27296): pid: 11466, tid: 11570, name: synthesize_thre >>> com.opus.demo <<<
03-29 11:22:15.068 F/DEBUG (27296): signal 4 (SIGILL), code 2 (ILL_ILLOPN), fault addr 0x76f9878cc7f0
03-29 11:22:15.068 F/DEBUG (27296): rax 0030788000000000 rbx 000076f9867a13d8 rcx 0000000000000001 rdx 0000000000000000
03-29 11:22:15.068 F/DEBUG (27296): rsi 0000000000000000 rdi 000076f9867a13d8
03-29 11:22:15.068 F/DEBUG (27296): r8 00000000000010c0 r9 0000000000000000 r10 000076f987fed888 r11 000076fa23dc3c78
03-29 11:22:15.068 F/DEBUG (27296): r12 000076f999656290 r13 0000000000000001 r14 000076f9867a1380 r15 00000000fffffffd
03-29 11:22:15.068 F/DEBUG (27296): cs 0000000000000033 ss 000000000000002b
03-29 11:22:15.068 F/DEBUG (27296): rip 000076f9878cc7f0 rbp 0000000000003e80 rsp 000076f988dae508 eflags 0000000000010246
03-29 11:22:15.079 F/DEBUG (27296):
03-29 11:22:15.079 F/DEBUG (27296): backtrace:
03-29 11:22:15.079 F/DEBUG (27296): #00 pc 000000000086b7f0 /data/app/com.opus.demo-7tJhpVdJ6izUjsPDL3NchQ==/lib/x86_64/libopus.so (silk_CNG_Reset+624)
03-29 11:22:15.079 F/DEBUG (27296): #01 pc 000000000085d282 /data/app/com.opus.demo-7tJhpVdJ6izUjsPDL3NchQ==/lib/x86_64/libopus.so (silk_init_decoder+50)
03-29 11:22:15.079 F/DEBUG (27296): #02 pc 000000000084a408 /data/app/com.opus.demo-7tJhpVdJ6izUjsPDL3NchQ==/lib/x86_64/libopus.so (silk_InitDecoder+8)
03-29 11:22:15.079 F/DEBUG (27296): #03 pc 0000000000847ccf /data/app/com.opus.demo-7tJhpVdJ6izUjsPDL3NchQ==/lib/x86_64/libopus.so (opus_decoder_init+255)
03-29 11:22:15.079 F/DEBUG (27296): #04 pc 0000000000847de6 /data/app/com.opus.demo-7tJhpVdJ6izUjsPDL3NchQ==/lib/x86_64/libopus.so (opus_decoder_create+150)
03-29 11:22:15.079 F/DEBUG (27296): #05 pc 0000000000255c69 /data/app/com.opus.demo-7tJhpVdJ6izUjsPDL3NchQ==/lib/x86_64/libopus.so (CodecsOpusDecoder::CodecsOpusDecoder(int)+57)
03-29 11:22:15.079 F/DEBUG (27296): #06 pc 0000000000237c95 /data/app/com.topus.demo-7tJhpVdJ6izUjsPDL3NchQ==/lib/x86_64/

Start with the supplied Android x86_64 crash log and trace the decoder initialization path from opus_decoder_create through opus_decoder_init, silk_InitDecoder, silk_init_decoder, and silk_CNG_Reset in libopus.so. Reproduce the SIGILL if possible, then identify and verify a fix for the crash on x86_64.