kernel panic in windows_web_app auto_heal settings

[calebak404]

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Terraform Version

1.5.2

AzureRM Provider Version

3.78

Affected Resource(s)/Data Source(s)

azurerm_windows_web_app, azurerm_windows_web_app_slot

Terraform Configuration Files

resource "azurerm_windows_web_app" "web_app" {
    dynamic "auto_heal_setting" {
      for_each = local.auto_heal_rule
      content {
        action {
          action_type = auto_heal_setting.value["action"].type
          dynamic "custom_action" {
            for_each = auto_heal_setting.value["action"].type == "CustomAction" ? ["1"] : []
            content {
              executable = auto_heal_setting.value["action"].custom_action.executable
              parameters = auto_heal_setting.value["action"].custom_action.parameters
            }
          }
          minimum_process_execution_time = auto_heal_setting.value["action"].minimum_execution_time
        }
        trigger {
          dynamic "status_code" {
            for_each = toset([for trigger in auto_heal_setting.value["trigger"] : trigger if trigger.type == "StatusCode"])
            content {
              count             = status_code.value["count"]
              interval          = status_code.value["interval"]
              status_code_range = status_code.value["value"]
              path              = status_code.value["path"] == "" ? var.auto_heal_enabled : status_code.value["path"]
            }
          }
          private_memory_kb = one(toset([for trigger in auto_heal_setting.value["trigger"] : trigger.value if trigger.type == "PrivateMemory"]))
        }
      }
    }
}

Debug Output/Panic Output

Stack trace from the terraform-provider-azurerm_v3.78.0_x5 plugin:

panic: runtime error: index out of range [0] with length 0

goroutine 1444 [running]:
github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice/helpers.expandAutoHealSettingsWindows({0xc002665110, 0x913a00b?, 0xc0016458a0?})
github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice/helpers/auto_heal.go:405 +0xc6f
github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice/helpers.(*SiteConfigWindowsWebAppSlot).ExpandForUpdate(0xc001646ad8, {0xc000e57680, {0x998d838, 0xc0003f2e28}, 0xc002034480, 0x0, {0x998d9f8, 0xf59a8e0}}, 0xc000dcc500, 0xc0024e2f00)
github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice/helpers/web_app_slot_schema.go:1278 +0x1965
github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice.(*WindowsWebAppSlotResource).Update.WindowsWebAppSlotResource.Update.func1({0x998b1b8, 0xc0002eb9d0}, {0xc000e57680, {0x998d838, 0xc0003f2e28}, 0xc002034480, 0x0, {0x998d9f8, 0xf59a8e0}})
github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice/windows_web_app_slot_resource.go:763 +0xbcc
github.com/hashicorp/terraform-provider-azurerm/internal/sdk.(*ResourceWrapper).Resource.func7({0x998b1b8, 0xc0002eb9d0}, 0x0?, {0x8229b60?, 0xc000e57680?})
github.com/hashicorp/terraform-provider-azurerm/internal/sdk/wrapper_resource.go:121 +0x150
github.com/hashicorp/terraform-provider-azurerm/internal/sdk.(*ResourceWrapper).Resource.(*ResourceWrapper).diagnosticsWrapper.diagnosticsWrapper.func13({0x998b1b8?, 0xc0002eb9d0?}, 0x0?, {0x8229b60?, 0xc000e57680?})
github.com/hashicorp/terraform-provider-azurerm/internal/sdk/wrapper_resource.go:190 +0x59
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).update(0xc0004edb20, {0x998b110, 0xc00185c420}, 0xd?, {0x8229b60, 0xc000e57680})
github.com/hashicorp/terraform-plugin-sdk/[email protected]/helper/schema/resource.go:812 +0x11b
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).Apply(0xc0004edb20, {0x998b110, 0xc00185c420}, 0xc002a3aa90, 0xc002321400, {0x8229b60, 0xc000e57680})
github.com/hashicorp/terraform-plugin-sdk/[email protected]/helper/schema/resource.go:919 +0x83a
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*GRPCProviderServer).ApplyResourceChange(0xc00023d6b0, {0x998b110?, 0xc00185c330?}, 0xc003543810)
github.com/hashicorp/terraform-plugin-sdk/[email protected]/helper/schema/grpc_provider.go:1060 +0xdbc
github.com/hashicorp/terraform-plugin-go/tfprotov5/tf5server.(*server).ApplyResourceChange(0xc0012fea00, {0x998b110?, 0xc0025ab7d0?}, 0xc00096c3f0)
github.com/hashicorp/[email protected]/tfprotov5/tf5server/server.go:859 +0x56a
github.com/hashicorp/terraform-plugin-go/tfprotov5/internal/tfplugin5._Provider_ApplyResourceChange_Handler({0x8d02020?, 0xc0012fea00}, {0x998b110, 0xc0025ab7d0}, 0xc00096c380, 0x0)
github.com/hashicorp/[email protected]/tfprotov5/internal/tfplugin5/tfplugin5_grpc.pb.go:467 +0x169
google.golang.org/grpc.(*Server).processUnaryRPC(0xc0003221e0, {0x999c8a0, 0xc00198e1a0}, 0xc002137320, 0xc001a56e40, 0xf55a9f8, 0x0)
google.golang.org/[email protected]/server.go:1374 +0xde7
google.golang.org/grpc.(*Server).handleStream(0xc0003221e0, {0x999c8a0, 0xc00198e1a0}, 0xc002137320, 0x0)
google.golang.org/[email protected]/server.go:1751 +0x9e7
google.golang.org/grpc.(*Server).serveStreams.func1.1()
google.golang.org/[email protected]/server.go:986 +0xbb
created by google.golang.org/grpc.(*Server).serveStreams.func1 in goroutine 52
google.golang.org/[email protected]/server.go:997 +0x145

Error: The terraform-provider-azurerm_v3.78.0_x5 plugin crashed!

This is always indicative of a bug within the plugin. It would be immensely
helpful if you could report the crash with the plugin's maintainers so that it
can be fixed. The output above should help diagnose the issue.

Expected Behaviour

Terraform applies the configuration.

Actual Behaviour

Provider panics.

Steps to Reproduce

No response

Important Factoids

No response

References

Likely issue was fixed for linux_web_app in #21328

[calebak404]

#23812 does not address if autoHeal.Actions is empty and does not have parity with the equivalent changes in the linux resource.

[github-actions]

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