Comment # 9 on bug 91315 from Dennis Schridde

After this, without rebooting, john will immediately segfault:
```
$ /usr/sbin/john --test=0 --verbosity=5
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 4352 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000000800000
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 4352 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000000800000
Segmentation fault
```