1.8 or latest code crashes in SIMD code

Since upgrading to 1.8 or the latest code I can no longer encode anything with FFmpeg. 1.7 worked fine. Disabling the assembly code so it falls back to the C code paths works fine.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000f34ed4aede9 in x265_pixel_sa8d_8x8_internal_avx2 () from /usr/local/lib/libx265.so.5.0
(gdb) bt full
#0  0x00000f34ed4aede9 in x265_pixel_sa8d_8x8_internal_avx2 () from /usr/local/lib/libx265.so.5.0
No symbol table info available.
#1  0x00000f34ed4aefff in x265_pixel_sa8d_16x16_internal_avx2 () from /usr/local/lib/libx265.so.5.0
No symbol table info available.
#2  0x00000f34ed4af0be in x265_pixel_sa8d_32x32_avx2 () from /usr/local/lib/libx265.so.5.0
No symbol table info available.
#3  0x00000f34ed421ac7 in x265::Search::estIntraPredQT (this=0xf34fdc9fbd0, intraMode=..., cuGeom=..., depthRange=0xf351ba5d6d0)
    at /home/ports/pobj/x265-1.9/x265_1.9/source/encoder/search.cpp:1527
        mode = 34
        fenc = 0xf34b73b0400 '\020' <repeats 200 times>...
        costShift = 2
        stride = 64
        mpms = 67108867
        sad = 114688
        scaleStride = 32
        mpmModes = {0, 1, 26}
        sa8d = 0xf34ed4af050 <x265_pixel_sa8d_32x32_avx2>
        modeCosts = {114689, 114691, 114696 <repeats 24 times>, 114691, 114696, 114696, 114696, 114696, 114696, 114696, 114696, 0}
        bits = 6
        planar = 0xf34fdc9fc38 '\200' <repeats 200 times>...
        paddedBcost = 0
        intraNeighbors = {numIntraNeighbor = 0, totalUnits = 65, aboveUnits = 32, leftUnits = 32, unitWidth = 4, unitHeight = 4, log2TrSize = 6, bNeighborFlags = {
            false <repeats 65 times>}}
        scaleTuSize = 32
        rbits = 6
        candCostList = {16720821992704, 16719027000128, 15, 4294967295, 16716901651536, 16718909078553, 25769803775, 25769803781, 16720771536448, 16719996900323, 25769803777, 8589934597, 
          16720771536496, 16719996878099, 463853168, 6}
        rdModeList = {0, 0, 0, 0, 2900807980, 3892, 2896359272, 3892, 266242, 0, 3623422084, 1074018641, 514309376, 3893, 270336, 0}
        bcost = 114689
        maxCandCount = 5
        bmode = 0
        icosts = {rdcost = 0, bits = 0, distortion = 0, energy = 0}
        puIdx = 0
        cu = @0xf34fdca62d8: {static s_partSet = {0xf34ed793e30 <bcast256(unsigned char*, unsigned char)>, 0xf34ed793e70 <bcast64(unsigned char*, unsigned char)>, 
            0xf34ed793f20 <bcast16(unsigned char*, unsigned char)>, 0xf34ed793f80 <bcast4(unsigned char*, unsigned char)>, 0xf34ed793fc0 <bcast1(unsigned char*, unsigned char)>}, 
          static s_numPartInCUSize = 16, m_encData = 0xf3493c9e400, m_slice = 0xf351ac36670, m_partCopy = 0xf34ed793ff0 <copy256(unsigned char*, unsigned char*)>, 
          m_partSet = 0xf34ed793e30 <bcast256(unsigned char*, unsigned char)>, m_subPartCopy = 0xf34ed794030 <copy64(unsigned char*, unsigned char*)>, 
          m_subPartSet = 0xf34ed793e70 <bcast64(unsigned char*, unsigned char)>, m_cuAddr = 0, m_absIdxInCTU = 0, m_cuPelX = 0, m_cuPelY = 0, m_numPartitions = 256, m_chromaFormat = 1, 
          m_hChromaShift = 1, m_vChromaShift = 1, m_qp = 0xf34f71f2a00 '\017' <repeats 200 times>..., m_log2CUSize = 0xf34f71f2b00 '\006' <repeats 200 times>..., 
          m_lumaIntraDir = 0xf34f71f2c00 '\377' <repeats 200 times>..., m_tqBypass = 0xf34f71f2e00 "", m_refIdx = {0xf34f71f2f00 '\377' <repeats 200 times>..., 
            0xf34f71f3000 '\377' <repeats 200 times>...}, m_cuDepth = 0xf34f71f3100 "", m_predMode = 0xf34f71f3200 '\002' <repeats 200 times>..., m_partSize = 0xf34f71f3300 "", 
          m_mergeFlag = 0xf34f71f3400 "", m_interDir = 0xf34f71f3500 "", m_mvpIdx = {0xf34f71f3600 "", 0xf34f71f3700 ""}, m_tuDepth = 0xf34f71f3800 "", m_transformSkip = {
            0xf34f71f3900 "", 0xf34f71f3a00 "", 0xf34f71f3b00 ""}, m_cbf = {0xf34f71f3c00 "", 0xf34f71f3d00 "", 0xf34f71f3e00 ""}, 
          m_chromaIntraDir = 0xf34f71f2d00 '\377' <repeats 200 times>..., m_trCoeff = {0xf34f4a5e000, 0xf34f4a60000, 0xf34f4a60800}, m_mv = {0xf34fc8de000, 0xf34fc8de400}, m_mvd = {
            0xf34fc8de800, 0xf34fc8dec00}, m_cuAboveLeft = 0x0, m_cuAboveRight = 0x0, m_cuAbove = 0x0, m_cuLeft = 0x0}
        reconYuv = 0xf34fdca6460
        predYuv = 0xf34fdca6430
        fencYuv = 0xf34fdcabc80
        depth = 0
        initTuDepth = 0
        numPU = 1
        log2TrSize = 6
        tuSize = 64
        qNumParts = 64
        sizeIdx = 3
        absPartIdx = 0
        totalDistortion = 0
        checkTransformSkip = 0
#4  0x00000f34ed420c56 in x265::Search::checkIntra (this=0xf34fdc9fbd0, intraMode=..., cuGeom=..., partSize=x265::SIZE_2Nx2N)
    at /home/ports/pobj/x265-1.9/x265_1.9/source/encoder/search.cpp:1171
        cu = @0xf34fdca62d8: {static s_partSet = <same as static member of an already seen type>, static s_numPartInCUSize = 16, m_encData = 0xf3493c9e400, m_slice = 0xf351ac36670, 
          m_partCopy = 0xf34ed793ff0 <copy256(unsigned char*, unsigned char*)>, m_partSet = 0xf34ed793e30 <bcast256(unsigned char*, unsigned char)>, 
          m_subPartCopy = 0xf34ed794030 <copy64(unsigned char*, unsigned char*)>, m_subPartSet = 0xf34ed793e70 <bcast64(unsigned char*, unsigned char)>, m_cuAddr = 0, m_absIdxInCTU = 0, 
          m_cuPelX = 0, m_cuPelY = 0, m_numPartitions = 256, m_chromaFormat = 1, m_hChromaShift = 1, m_vChromaShift = 1, m_qp = 0xf34f71f2a00 '\017' <repeats 200 times>..., 
          m_log2CUSize = 0xf34f71f2b00 '\006' <repeats 200 times>..., m_lumaIntraDir = 0xf34f71f2c00 '\377' <repeats 200 times>..., m_tqBypass = 0xf34f71f2e00 "", m_refIdx = {
            0xf34f71f2f00 '\377' <repeats 200 times>..., 0xf34f71f3000 '\377' <repeats 200 times>...}, m_cuDepth = 0xf34f71f3100 "", 
          m_predMode = 0xf34f71f3200 '\002' <repeats 200 times>..., m_partSize = 0xf34f71f3300 "", m_mergeFlag = 0xf34f71f3400 "", m_interDir = 0xf34f71f3500 "", m_mvpIdx = {
            0xf34f71f3600 "", 0xf34f71f3700 ""}, m_tuDepth = 0xf34f71f3800 "", m_transformSkip = {0xf34f71f3900 "", 0xf34f71f3a00 "", 0xf34f71f3b00 ""}, m_cbf = {0xf34f71f3c00 "", 
            0xf34f71f3d00 "", 0xf34f71f3e00 ""}, m_chromaIntraDir = 0xf34f71f2d00 '\377' <repeats 200 times>..., m_trCoeff = {0xf34f4a5e000, 0xf34f4a60000, 0xf34f4a60800}, m_mv = {
            0xf34fc8de000, 0xf34fc8de400}, m_mvd = {0xf34fc8de800, 0xf34fc8dec00}, m_cuAboveLeft = 0x0, m_cuAboveRight = 0x0, m_cuAbove = 0x0, m_cuLeft = 0x0}
        tuDepthRange = {5, 5}
        bCodeDQP = false
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