Unable to provision cloud instance

[agrare]

Attempting to provision a GCE instance from an image, loading the provision dialog bloats the session to 1.5MB and the session is dropped. Clicking on anything after this states that " Session was timed out due to inactivity. Please log in again. " and am redirected to the login screen.

[----] D, [2020-06-17T14:59:40.017225 #499410:aebc8] DEBUG -- :   MiqTemplate Load (0.5ms)  SELECT  "vms".* FROM "vms" WHERE "vms"."type" IN ('MiqTemplate', 'ManageIQ::Providers::CloudManager::Template', 'ManageIQ::Providers::InfraManager::Template', 'ManageIQ::Providers::Amazon::CloudManager::Template', 'ManageIQ::Providers::Azure::CloudManager::Template', 'ManageIQ::Providers::Google::CloudManager::Template', 'ManageIQ::Providers::Openstack::CloudManager::BaseTemplate', 'ManageIQ::Providers::Vmware::CloudManager::Template', 'ManageIQ::Providers::Openstack::CloudManager::Template', 'ManageIQ::Providers::Openstack::CloudManager::VolumeSnapshotTemplate', 'ManageIQ::Providers::Openstack::CloudManager::VolumeTemplate', 'ManageIQ::Providers::Vmware::InfraManager::Template', 'ManageIQ::Providers::Kubevirt::InfraManager::Template', 'ManageIQ::Providers::Redhat::InfraManager::Template', 'ManageIQ::Providers::Microsoft::InfraManager::Template', 'ManageIQ::Providers::Openstack::InfraManager::Template') AND "vms"."template" = $1 AND "vms"."id" = $2 LIMIT $3  [["template", true], ["id", 3885], ["LIMIT", 1]]
[----] D, [2020-06-17T14:59:40.017838 #499410:aebc8] DEBUG -- :   MiqTemplate Inst Including Associations (0.2ms - 1rows)
[----] I, [2020-06-17T14:59:40.018912 #499410:aebc8]  INFO -- :   Rendered /home/grare/adam/src/manageiq/manageiq-ui-classic/app/views/layouts/_breadcrumbs.html.haml (5.7ms)
Session:	 Hash of Size 1525991, Elements 35
=================================
MIQ(vm_cloud_controller-x_button): Session object size of 1.5 MB exceeds threshold of 100 KB
[----] D, [2020-06-17T14:59:40.081641 #499410:aebc8] DEBUG -- :    (0.5ms)  SELECT COUNT(*) FROM (SELECT DISTINCT "tags"."id" FROM "tags" LEFT OUTER JOIN "taggings" ON "taggings"."tag_id" = "tags"."id" WHERE "taggings"."taggable_type" = 'VmOrTemplate' AND "taggings"."taggable_id" = 3885 AND "tags"."name" ILIKE '/user/admin%') subquery_for_count
[----] D, [2020-06-17T14:59:40.082635 #499410:aebc8] DEBUG -- :   SQL (0.4ms)  SELECT  DISTINCT "tags"."id" FROM "tags" LEFT OUTER JOIN "taggings" ON "taggings"."tag_id" = "tags"."id" WHERE "taggings"."taggable_type" = 'VmOrTemplate' AND "taggings"."taggable_id" = 3885 AND "tags"."name" ILIKE '/user/admin%' LIMIT $1  [["LIMIT", 11]]
[----] I, [2020-06-17T14:59:40.555400 #499410:aebc8]  INFO -- : Completed 200 OK in 4319ms (Views: 0.5ms | ActiveRecord: 373.2ms)


Warning! ActionDispatch::Session::MemCacheStore failed to save session. Content dropped.
[----] D, [2020-06-17T14:59:40.611366 #499410:aebc8] DEBUG -- : PostgreSQLAdapter#log_after_checkin, connection_pool: size: 5, connections: 5, in use: 1, waiting_in_queue: 0
[----] I, [2020-06-17T15:00:02.934464 #499410:aeb50]  INFO -- : Started POST "/vm_cloud/pre_prov_continue?button=cancel" for 127.0.0.1 at 2020-06-17 15:00:02 -0400
[----] I, [2020-06-17T15:00:02.971926 #499410:aeb50]  INFO -- : Processing by VmCloudController#pre_prov_continue as JS
[----] I, [2020-06-17T15:00:02.972071 #499410:aeb50]  INFO -- :   Parameters: {"button"=>"cancel"}
[----] W, [2020-06-17T15:00:02.972711 #499410:aeb50]  WARN -- : Can't verify CSRF token authenticity.
[----] I, [2020-06-17T15:00:02.974461 #499410:aeb50]  INFO -- : Filter chain halted as :check_privileges rendered or redirected
[----] I, [2020-06-17T15:00:02.974707 #499410:aeb50]  INFO -- : Completed 200 OK in 2ms (Views: 0.4ms | ActiveRecord: 0.0ms)

[agrare]

cc @h-kataria

[jrafanie]

Closing as duplicate of #7877, which is the more general problem, that workflow objects are being stored directly in the session.