segfault once every few hours. 
The miner crashes once every few hours with segfault. 

```

[2019-05-15 19:56:33] speed 10s/60s/15m 927.0 927.0 925.9 H/s max 942.6 H/s
[2019-05-15 19:57:33] speed 10s/60s/15m 927.0 926.6 925.7 H/s max 942.6 H/s
[2019-05-15 19:57:52] new job from pool.minexmr.com:4444 diff 355425 algo cn/r height 1835318
[2019-05-15 19:58:33] speed 10s/60s/15m 928.5 927.9 925.5 H/s max 942.6 H/s
[2019-05-15 19:58:47] accepted (80/0) diff 355425 (68 ms)
[2019-05-15 19:59:33] speed 10s/60s/15m 348.1 928.0 925.6 H/s max 942.6 H/s
**Segmentation fault**
[root@localhost build]# echo $?
139
[root@localhost build]#
```

Then if I start it again it works normal, but within 5-10 hours it will for sure crash again:

```

[root@localhost build]# ./xmrig-amd 
 * ABOUT        XMRig-AMD/2.14.1 gcc/5.3.1
 * LIBS         libuv/1.27.0 OpenCL/2.0 OpenSSL/1.0.2k microhttpd/0.9.33 
 * CPU          Intel(R) Xeon(R) CPU           E5405  @ 2.00GHz x64 -AES
 * ALGO         cryptonight, donate=5%
 * POOL #1      pool.minexmr.com:4444 variant auto
 * API BIND     0.0.0.0:1026
 * COMMANDS     hashrate, pause, resume
[2019-05-16 11:44:47] compiling code and initializing GPUs. This will take a while...
[2019-05-16 11:44:48] found AMD platform index: 0, name: Advanced Micro Devices, Inc.
[2019-05-16 11:44:48] #00, GPU #00 Radeon RX 580 Series (Ellesmere), i:768 (8/256), si:2/2, u:8, cu:36
[2019-05-16 11:44:48]              1.50/3.95/8 GB
[2019-05-16 11:44:48] #01, GPU #01 AMD Radeon (TM) R7 300 Series (Pitcairn), i:864 (8/256), si:2/2, u:8, cu:8
[2019-05-16 11:44:48]              1.69/3.75/4 GB
[2019-05-16 11:44:48] use pool pool.minexmr.com:4444  37.59.55.60 
```
