Isso pode muito bem ser, está travando em uma rotina de análise de json, no código do message bus, embora essa alteração que você mencionou tenha mais de 4 meses.
-- Informações de backtrace do nível C -------------------------------------------
/usr/local/lib/libruby.so.2.7(rb_vm_bugreport+0x50a) [0x7f30fc64839a] vm_dump.c:755
[0x7f30fc4b9b47]
/usr/local/lib/libruby.so.2.7(sigill+0x3b) [0x7f30fc5c4f0b] signal.c:962
/lib/x86_64-linux-gnu/libc.so.6(0x7f30fc283d60) [0x7f30fc283d60]
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/oj-3.13.15/lib/oj/oj.so(oj_parse2+0x4f9) [0x7f30f3a68339] /usr/lib/gcc/x86_64-linux-gnu/10/include/smmintrin.h:649
I, [2022-07-05T10:03:30.513303 #1] INFO -- : cd /var/www/discourse && su discourse -c 'bundle exec rake db:migrate'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus/codec/json.rb:11: [BUG] Illegal instruction at 0x00007f30f3a68339
ruby 2.7.6p219 (2022-04-12 revision c9c2245c0a) [x86_64-linux]
-- Informações do frame de controle ----------------------------------------------
c:0030 p:---- s:0162 e:000161 CFUNC :parse
c:0029 p:0013 s:0157 e:000156 METHOD /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus/codec/json.rb:11
c:0028 p:0037 s:0152 e:000151 METHOD /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus.rb:648
c:0027 p:0020 s:0144 e:000143 BLOCK /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus.rb:766
c:0026 p:0082 s:0135 e:000134 BLOCK /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus/backends/redis.rb:330
c:0025 p:0024 s:0130 e:000129 BLOCK /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.5.1/lib/redis/subscribe.rb:46
c:0024 p:0034 s:0124 e:000123 BLOCK /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.5.1/lib/redis/client.rb:183 [FINISH]