When running test in Rails I came across several configuration failure and crashes, let me share them
Parallel tests crashes sometimes
Running rails test looks like:
/Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/pg-1.5.9/lib/pg/connection.rb:703: [BUG] Segmentation fault at 0x0000000120390b28
ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [arm64-darwin24]
-- Crash Report log information --------------------------------------------
See Crash Report log file in one of the following locations:
* ~/Library/Logs/DiagnosticReports
* /Library/Logs/DiagnosticReports
for more details.
Don't forget to include the above Crash Report log file in bug reports.
-- Control frame information -----------------------------------------------
c:0059 p:---- s:0342 e:000341 CFUNC :connect_poll
c:0058 p:0351 s:0338 e:000337 METHOD /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/pg-1.5.9/lib/pg/connection.rb:703
c:0057 p:0141 s:0325 e:000324 METHOD /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/pg-1.5.9/lib/pg/connection.rb:844
c:0056 p:0007 s:0316 e:000315 METHOD /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/pg-1.5.9/lib/pg/connection.rb:772
c:0055 p:0012 s:0310 e:000309 METHOD /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/pg-1.5.9/lib/pg.rb:63
c:0054 p:0006 s:0304 e:000303 METHOD /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/postgresql
c:0053 p:0008 s:0298 e:000297 METHOD /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/postgresql
c:0052 p:0020 s:0293 e:000292 METHOD /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/activerecord-8.0.2/lib/active_record/connection_adapters/postgresql
...
-- Ruby level backtrace information ----------------------------------------
/Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/minitest-5.25.5/lib/minitest.rb:86:in 'block in autorun'
/Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/minitest-5.25.5/lib/minitest.rb:285:in 'run'
/Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/testing/parallelize_executor.rb:19:in 'start'
/Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/testing/parallelization.rb:36:in 'start'
/Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/testing/parallelization.rb:36:in 'map'
/Users/kevin/.rbenv/versions/3.4.2/lib/ruby/gems/3.4.0/gems/activesupport-8.0.2/lib/active_support/testing/parallelization.rb:36:in 'each'
<internal:numeric>:257:in 'times'
...
-- Threading information ---------------------------------------------------
Total ractor count: 1
Ruby thread count for this ractor: 4
-- Machine register context ------------------------------------------------
x0: 0x00000001f5ed4d2c x1: 0x0000000000000000 x2: 0x0000000186d47bb4
x3: 0x000000000000000c x4: 0x0000000186e1b024 x5: 0x000000016b88b170
x6: 0x0000000000000000 x7: 0x0000000000000810 x18: 0x0000000000000000
x19: 0x000000013081bb70 x20: 0x0000000120390b2a x21: 0x0000000fffffc104
x22: 0x0000000000000002 x23: 0x00000001252fbeb0 x24: 0x0000000000000001
x25: 0x0000000000000000 x26: 0x0000000000000000 x27: 0x0000000130991938
x28: 0x0000000130991908 lr: 0x0000000186d49f08 fp: 0x000000016b88b180
sp: 0x000000016b88b140
-- C level backtrace information -------------------------------------------
/Users/kevin/.rbenv/versions/3.4.2/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x104efffa8]
/Users/kevin/.rbenv/versions/3.4.2/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x104d3b940]
/Users/kevin/.rbenv/versions/3.4.2/lib/libruby.3.4.dylib(sigsegv+0x84) [0x104e60f54]
/usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x18703b624]
/usr/lib/system/libsystem_trace.dylib(_os_log_preferences_refresh+0x24) [0x186d49f08]
[0x186d4a884]
[0x186d06428]
[0x186d08d00]
[0x121b1af54]
[0x121b1aa40]
-- Other runtime information -----------------------------------------------
* Loaded script: bin/rails
* Loaded features:
0 enumerator.so
1 thread.rb
2 fiber.so
3 rational.so
4 complex.so
5 ruby2_keywords.rb
6 /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/3.4.0/arm64-darwin24/enc/encdb.bundle
7 /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/3.4.0/arm64-darwin24/enc/trans/transdb.bundle
8 /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/3.4.0/arm64-darwin24/rbconfig.rb
9 /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/3.4.0/rubygems/compatibility.rb
10 /Users/kevin/.rbenv/versions/3.4.2/lib/ruby/3.4.0/rubygems/defaults.rb
...
Do you have platform filtering?
I experienced a configuration leading me to test using macOs with wrong
platform filtering. I and to update my Gemfile like so
- gem 'debug', platforms: %i[ruby mri mingw x64_mingw windows]
+ gem 'debug'
Then update Gemfile.lock with
bundle update
No more crashes
Are your Gemfile and Gemfile.lock synchronized?
I also came across a case where my Gemfile had on dependency not referenced
in my Gemfile.lock.
Just try an update to fix all this.
bundle update
rails test
You should be all set
System test does not work?
When you run rails test:system, it fails and generate weird screenshots in
tmp/screenshots?
Try this:
rails assets:precompile
rails test:system
It should be fixed.