Estimated time to produce becomes negative when target >= 31

[arhag]

The problem is with this line:

steem/libraries/plugins/witness/witness.cpp

Line 388 in b3cb377

auto hashes = 1 << bits;

At least in my compiler (gcc), 1 << bits assumes a 32-bit signed integer, so when bits == 31, hashes becomes a negative number.

The easiest fix is to replace the line with:
auto hashes = 1ULL << bits;

I tried this and it worked on my computer. But this is only a temporary fix because if the mining queue becomes long enough (I think over 231) then this fix will also break. Perhaps the mining queue is unlikely to get that long and this is a good enough fix. Or maybe you guys want to come up with a more robust solution.

[arhag]

I see you fixed this bug with commit 38e456e.

I will close this issue now.