ActionController::RoutingError (No route matches [PATCH] "/users/sign_in")

Summary

When logging in with username+password, the user is shown a 404 page instead of being logged in.

Steps to reproduce

With an account on https://gitlab.common-lisp.net/, use the option to log in with username+password, from an IPv6 address (may or may not matter; the user with the symptoms and I both have only IPv6 available).

The result is the 404 page.

The logs show (the error for the user):

Started PATCH "/users/sign_in" for 2001:871:218:d5a4:688e:c7:9d81:2959 at 2020-07-23 13:36:49 +0000
  
ActionController::RoutingError (No route matches [PATCH] "/users/sign_in"):
  
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'
lib/gitlab/middleware/request_context.rb:23:in `call'
config/initializers/fix_local_cache_middleware.rb:9:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:60:in `call'
lib/gitlab/middleware/release_env.rb:12:in `call'

When trying it myself, the browser doesn't show a PATCH request, but a POST instead (the difference in IP address is because this comes from my own testing - copied from FF dev tools):

{"POST":{"scheme":"https","host":"gitlab.common-lisp.net","filename":"/users/sign_in","remote":{"Address":"[2a01:4f8:200:4310::30]:443"}}}

Example Project

Not project related.

What is the current bug behavior?

The user isn't logged in, but gets a 404 page.

What is the expected correct behavior?

Before the upgrade to 13.2.0 just a half hour ago, the user would be logged in.

Relevant logs and/or screenshots

Started PATCH "/users/sign_in" for 2001:871:218:d5a4:688e:c7:9d81:2959 at 2020-07-23 13:36:49 +0000
  
ActionController::RoutingError (No route matches [PATCH] "/users/sign_in"):
  
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'
lib/gitlab/middleware/request_context.rb:23:in `call'
config/initializers/fix_local_cache_middleware.rb:9:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:60:in `call'
lib/gitlab/middleware/release_env.rb:12:in `call'

Output of checks

(If you are reporting a bug on GitLab.com, write: This bug happens on GitLab.com)

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:		Debian 9.13
Current User:	git
Using RVM:	no
Ruby Version:	2.6.6p146
Gem Version:	2.7.10
Bundler Version:1.17.3
Rake Version:	12.3.3
Redis Version:	5.0.9
Git Version:	2.27.0
Sidekiq Version:5.2.9
Go Version:	unknown

GitLab information
Version:	13.2.0
Revision:	d47fc5085a7
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	11.7
URL:		https://gitlab.common-lisp.net
HTTP Clone URL:	https://gitlab.common-lisp.net/some-group/some-project.git
SSH Clone URL:	git@common-lisp.net:some-group/some-project.git
Using LDAP:	no
Using Omniauth:	yes
Omniauth Providers: github, google_oauth2

GitLab Shell
Version:	13.3.0
Repository storage paths:
- default: 	/srv/repos/gitlab/repositories
GitLab Shell path:		/opt/gitlab/embedded/service/gitlab-shell
Git:		/opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 13.3.0 ? ... OK (13.3.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Checking Reply by email ...
IMAP server credentials are correct? ... Checking clogitlabinbound@gmail.com
yes
Init.d configured correctly? ... skipped
MailRoom running? ... skipped
Checking Reply by email ... Finished
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab App ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
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Redis version >= 4.0.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.6)
Git version >= 2.22.0 ? ... yes (2.27.0)
Git user has default SSH configuration? ... yes
Active users: ... 737
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... no
Try fixing it:
Please migrate all projects to hashed storage
as legacy storage is deprecated in 13.0 and support will be removed in 14.0.
For more information see:
doc/administration/repository_storage_types.md
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)