Bug #18604
Updated by mentalizer (Jakob Skjerning) over 2 years ago
After upgrading to Ruby 3.1 one of our statistical dashboards started crashing with a message saying
[BUG] ERROR(VpDivd): space for remainder too small
### How to reproduce
This can be reproduced in irb (reproduction script is attached containing the below code):
``` ruby
$ irb
3.1.1 :001 > require "bigdecimal"
=> true
3.1.1 :002 > 1.0 / BigDecimal("0.9652409267836026803310997240835632636973e2")
```
### Actual result
```ruby
(irb):2: [BUG] ERROR(VpDivd): space for remainder too small.
ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [arm64-darwin21]
-- Crash Report log information --------------------------------------------
... etc...
```
Full output from running reproduction script has been attached.
```
### Expected results
The result of division, which is roughly:
```
=> 0.10360107743589181177761764314914637186293143963577706371029263e-1
```
### Affected Rubies
So far I've been able to reproduce this on...
- ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [arm64-darwin21]
- ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-linux]
- ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [arm64-darwin21]
The following seem to work just fine:
- ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [arm64-darwin21]
### Notes
Admittedly, the precision here is way higher that we actually need it to be, and our workaround has been to simply convert the BigDecimal to Float before dividing.
```ruby
1.0 / BigDecimal("0.9652409267836026803310997240835632636973e2").to_f
# => 0.010360107743589182
```