Can't push to heroku, sassc segmentation fault

Question

I am having trouble pushing to heroku, I've already tried others solutions related to Precompiling assets failed., like modifing application.rb to disable precompiled assets, running rake assets:precompile, and updating to rails 6.3.1 to prevent mimemagic recent error.

Taking a look at heroku logs, I noticed:

tmp/build_7857ebbd/vendor/bundle/ruby/3.0.0/gems/sassc-2.4.0/lib/sassc/engine.rb:43: [BUG] Segmentation fault at 0x0000000000000000 ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux]

Part of heroku's log

       ...
       yarn install v1.22.4
       [1/4] Resolving packages...
       [2/4] Fetching packages...
       info fsevents@2.1.3: The platform "linux" is incompatible with this module.
       info "fsevents@2.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.
       info fsevents@1.2.13: The platform "linux" is incompatible with this module.
       info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
       [3/4] Linking dependencies...
       [4/4] Building fresh packages...
       Done in 5.07s.
       /tmp/build_7857ebbd/vendor/bundle/ruby/3.0.0/gems/sassc-2.4.0/lib/sassc/engine.rb:43: [BUG] Segmentation fault at 0x0000000000000000
       ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux]
       
       -- Control frame information -----------------------------------------------
       c:0042 p:---- s:0308 e:000307 CFUNC  :compile_data_context
       c:0041 p:0314 s:0303 e:000302 METHOD /tmp/build_7857ebbd/vendor/bundle/ruby/3.0.0/gems/sassc-2.4.0/lib/sassc/engine.rb:43
       c:0040 p:0044 s:0291 e:000290 METHOD /tmp/build_7857ebbd/vendor/bundle/ruby/3.0.0/gems/sassc-rails-2.1.2/lib/sassc/rails/compressor.rb:29
       c:0039 p:0007 s:0285 e:000284 METHOD /tmp/build_7857ebbd/vendor/bundle/ruby/3.0.0/gems/sprockets-4.0.2/lib/sprockets/sass_compressor.rb:30
       c:0038 p:0047 s:0280 e:000279 METHOD /tmp/build_7857ebbd/vendor/bundle/ruby/3.0.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:84
       c:0037 p:0014 s:0272 e:000271 BLOCK  /tmp/build_7857ebbd/vendor/bundle/ruby/3.0.0/gems/sprockets-4.0.2/lib/sprockets/processor_utils.rb:66 [FINISH]
       .....
       c:0036 p:---- s:0267 e:000266 CFUNC  :reverse_each
  7f104d3bd000-7f104d3be000 rw-p 00000000 00:00 0 
       7fffab4a6000-7fffac4a5000 rw-p 00000000 00:00 0                          [stack]
       7fffac503000-7fffac505000 r--p 00000000 00:00 0                          [vvar]
       7fffac505000-7fffac507000 r-xp 00000000 00:00 0                          [vdso]
       ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
       
       
       Aborted
 !
 !     Precompiling assets failed.
 !
 !     Push rejected, failed to compile Ruby app.
 !     Push failed

user_584728 · Answer

Based on the same thread, I found this solution more suitable than downgrading a bunch of gems.

Putting this at the top of your initializers/assets.rb enabled the assets to compile successfully

# config/initializers/assets.rb
Rails.application.config.assets.configure do |env|
  env.export_concurrent = false
end

Still a hack, but another option.

Source: https://github.com/sass/sassc-ruby/issues/197#issuecomment-735359755

user_5800111 · Answer

It seems to be a recent bug as reported in issue 133 and 197

One solution is to use an older sassc version. In particular, I've tried:

gem 'sassc', '~> 2.0', '>= 2.0.1'
gem 'sprockets', '~> 3.7.2'
gem 'sass-rails', '~> 5.1.0 ' 
gem 'concurrent-ruby',  '~>1.1.5'

Which works just fine. All available versions are listed here

user_1986068 · Answer

I've seen sassc segmentation fault errors before when upgrading between Ruby versions on heroku (in this case it was from Ruby 3.1.0 to 3.1.1). I recommend trying two things first:

Make sure you can precompile production assets locally RAILS_ENV=production rails assets:precompile
Clear the Heroku build cache:
- Install heroku-repo plugin heroku plugins:install heroku-repo
- heroku repo:purge_cache -a appname
- redeploy to Heroku

Can't push to heroku, sassc segmentation fault

3 Answers