Segmentation fault

[dirceu-jr]

Hello,
I'm on MacOS. I'm getting segmentation fault after I use .to_a in a Vips::Image object. But it's not on a simple Vips::Image.

In fact .to_a to a RGB Vips::Image works.
But I get the segmentation fault when I do something like:

image = Vips::Image.new_from_file("tiny_or_big_image.png")
r, g, b, a = image.bandsplit
l = r / g
p l.to_a # it prints
p l.min # it prints
l *= 255
p l.min # do not print, segmentation fault here

.rvm/gems/ruby-2.5.0/gems/ruby-vips-2.0.9/lib/vips/operation.rb:72: [BUG] Segmentation fault at 0x0000000000000000
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
-- Control frame information -----------------------------------------------
c:0009 p:---- s:0070 e:000069 CFUNC :vips_cache_operation_build

my libvips is 8.6.2 via homebrew

It does not matter if its a tiny of big image file.

I will not need to use l.min in production, but it is helping me to figure out something about my usage of libvips.

[jcupitt]

Hello, I agree, I see a crash here with this test program:

#!/usr/bin/env ruby

require 'vips'

l = Vips::Image.black 10, 10
l += 2
x = l.write_to_memory
y = l.write_to_memory

I'll investigate.

Thank you for the report!

[jcupitt]

I think I've found a nice fix -- would you be able to test HEAD of the 8.6 branch of libvips?

[dirceu-jr]

@jcupitt Tested with HEAD of 8.6 (8.6.3). Works fine. Thank you.

$vips --version
vips-8.6.3-Sun Mar  4 22:50:55 UTC 2018

I could properly execute the provided script in Issue first comment without segmentation fault occurrence.

[jcupitt]

That's great, thanks!

I'll push out 8.6.3 in a day or so with this fix.