ID 349928 - Nuke crashes with iDistort node when passing large +/- alternating values

Problem summary
Using a simple graph that has a checkerboard feeding an expression, where every other pixel is being set to a value alternating between +/- 1.7e+16 on the disparityL channel, passing the values into a iDistort node will crash Nuke. 

This behaviour has been witnessed when the disparity pass has very large variations per pixel. 

Through testing, the crashing point is around 1.7e+16. Anything less (1.6e+16) does not cause the crash.

The issue is regressive with Nuke9.0v9

Customer reported version
nuke.11.1v1

Customer reported platform
rhel7

Steps to reproduce

1)  Open Nuke 

2)  Copy/Paste the following into the Node Graph:  (This will create a Checkerboard, Expression & iDistort node with the correct values) 

set cut_paste_input [stack 0]version 11.1 v3CheckerBoard2 { inputs 0 format "1920 804 0 0 1920 804 1 full_res" boxsize 16 name CheckerBoard2 selected true xpos 615 ypos 82}Expression { channel0 {disparityL.x -disparityL.y} expr0 " fmod(y,2) >0 ? 1.7e+16 : -1.7e+16" channel1 {-disparityL.x disparityL.y} expr1 "fmod(x,2) >0 ? -1.7e+16 : 1.7e+16" name Expression1 selected true xpos 615 ypos 204}IDistort { uv disparityL uv_scale {1 0} name IDistort1 selected true xpos 614 ypos 296}