insert panic handlers

internal/backend/local/backend.go

@@ -14,6 +14,7 @@ import (
 	"github.com/hashicorp/terraform/internal/backend"
 	"github.com/hashicorp/terraform/internal/command/views"
 	"github.com/hashicorp/terraform/internal/configs/configschema"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/states/statemgr"
 	"github.com/hashicorp/terraform/internal/terraform"
 	"github.com/hashicorp/terraform/internal/tfdiags"
@@ -313,6 +314,7 @@ func (b *Local) Operation(ctx context.Context, op *backend.Operation) (*backend.
 
 	// Do it
 	go func() {
+		defer logging.PanicHandler()
 		defer done()
 		defer stop()
 		defer cancel()

internal/backend/local/backend_apply.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/hashicorp/terraform/internal/backend"
 	"github.com/hashicorp/terraform/internal/command/views"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/plans"
 	"github.com/hashicorp/terraform/internal/states"
 	"github.com/hashicorp/terraform/internal/states/statefile"
@@ -156,6 +157,7 @@ func (b *Local) opApply(
 	var applyDiags tfdiags.Diagnostics
 	doneCh := make(chan struct{})
 	go func() {
+		defer logging.PanicHandler()
 		defer close(doneCh)
 		log.Printf("[INFO] backend/local: apply calling Apply")
 		applyState, applyDiags = lr.Core.Apply(plan, lr.Config)

internal/backend/local/backend_plan.go

@@ -6,6 +6,7 @@ import (
 	"log"
 
 	"github.com/hashicorp/terraform/internal/backend"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/plans"
 	"github.com/hashicorp/terraform/internal/plans/planfile"
 	"github.com/hashicorp/terraform/internal/states/statefile"
@@ -79,6 +80,7 @@ func (b *Local) opPlan(
 	var planDiags tfdiags.Diagnostics
 	doneCh := make(chan struct{})
 	go func() {
+		defer logging.PanicHandler()
 		defer close(doneCh)
 		log.Printf("[INFO] backend/local: plan calling Plan")
 		plan, planDiags = lr.Core.Plan(lr.Config, lr.InputState, lr.PlanOpts)

internal/backend/local/backend_refresh.go

@@ -7,6 +7,7 @@ import (
 	"os"
 
 	"github.com/hashicorp/terraform/internal/backend"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/states"
 	"github.com/hashicorp/terraform/internal/states/statemgr"
 	"github.com/hashicorp/terraform/internal/tfdiags"
@@ -77,6 +78,7 @@ func (b *Local) opRefresh(
 	var refreshDiags tfdiags.Diagnostics
 	doneCh := make(chan struct{})
 	go func() {
+		defer logging.PanicHandler()
 		defer close(doneCh)
 		newState, refreshDiags = lr.Core.Refresh(lr.Config, lr.InputState, lr.PlanOpts)
 		log.Printf("[INFO] backend/local: refresh calling Refresh")

internal/backend/remote/backend.go

@@ -18,6 +18,7 @@ import (
 	"github.com/hashicorp/terraform-svchost/disco"
 	"github.com/hashicorp/terraform/internal/backend"
 	"github.com/hashicorp/terraform/internal/configs/configschema"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/states/remote"
 	"github.com/hashicorp/terraform/internal/states/statemgr"
 	"github.com/hashicorp/terraform/internal/terraform"
@@ -755,6 +756,7 @@ func (b *Remote) Operation(ctx context.Context, op *backend.Operation) (*backend
 
 	// Do it.
 	go func() {
+		defer logging.PanicHandler()
 		defer done()
 		defer stop()
 		defer cancel()

internal/backend/remote/backend_common.go

@@ -13,6 +13,7 @@ import (
 
 	tfe "github.com/hashicorp/go-tfe"
 	"github.com/hashicorp/terraform/internal/backend"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/plans"
 	"github.com/hashicorp/terraform/internal/terraform"
 )
@@ -464,6 +465,8 @@ func (b *Remote) confirm(stopCtx context.Context, op *backend.Operation, opts *t
 	result := make(chan error, 2)
 
 	go func() {
+		defer logging.PanicHandler()
+
 		// Make sure we cancel doneCtx before we return
 		// so the input command is also canceled.
 		defer cancel()

internal/backend/remote/backend_plan.go

@@ -17,6 +17,7 @@ import (
 	tfe "github.com/hashicorp/go-tfe"
 	version "github.com/hashicorp/go-version"
 	"github.com/hashicorp/terraform/internal/backend"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/plans"
 	"github.com/hashicorp/terraform/internal/tfdiags"
 )
@@ -319,6 +320,8 @@ in order to capture the filesystem context the remote workspace expects:
 	// cancellable after that period, we attempt to cancel it.
 	if lockTimeout := op.StateLocker.Timeout(); lockTimeout > 0 {
 		go func() {
+			defer logging.PanicHandler()
+
 			select {
 			case <-stopCtx.Done():
 				return

internal/command/login.go

@@ -22,6 +22,7 @@ import (
 	"github.com/hashicorp/terraform-svchost/disco"
 	"github.com/hashicorp/terraform/internal/command/cliconfig"
 	"github.com/hashicorp/terraform/internal/httpclient"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/terraform"
 	"github.com/hashicorp/terraform/internal/tfdiags"
 
@@ -450,6 +451,7 @@ func (c *LoginCommand) interactiveGetTokenByCode(hostname svchost.Hostname, cred
 		}),
 	}
 	go func() {
+		defer logging.PanicHandler()
 		err := server.Serve(listener)
 		if err != nil && err != http.ErrServerClosed {
 			diags = diags.Append(tfdiags.Sourceless(

internal/logging/panic.go

@@ -12,7 +12,6 @@ import (
 
 // This output is shown if a panic happens.
 const panicOutput = `
-
 !!!!!!!!!!!!!!!!!!!!!!!!!!! TERRAFORM CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
 Terraform crashed! This is always indicative of a bug within Terraform.
@@ -24,11 +23,11 @@ shown below, and any additional information which may help replicate the issue.
 [1]: https://github.com/hashicorp/terraform/issues
 
 !!!!!!!!!!!!!!!!!!!!!!!!!!! TERRAFORM CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
 `
 
-// PanicHandler is called to  recover from an internal panic in Terraform, and
+// PanicHandler is called to recover from an internal panic in Terraform, and
-// is intended to replace the standard stack trace with a more user friendly
+// augments the standard stack trace with a more user friendly error message.
-// error message.
 // PanicHandler must be called as a defered function.
 func PanicHandler() {
 	recovered := recover()

internal/terraform/context.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/hashicorp/terraform/internal/addrs"
 	"github.com/hashicorp/terraform/internal/configs"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/providers"
 	"github.com/hashicorp/terraform/internal/provisioners"
 	"github.com/hashicorp/terraform/internal/states"
@@ -264,6 +265,8 @@ func (c *Context) watchStop(walker *ContextGraphWalker) (chan struct{}, <-chan s
 	done := c.runContext.Done()
 
 	go func() {
+		defer logging.PanicHandler()
+
 		defer close(wait)
 		// Wait for a stop or completion
 		select {

internal/terraform/graph.go

@@ -4,6 +4,7 @@ import (
 	"log"
 	"strings"
 
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/internal/tfdiags"
 
 	"github.com/hashicorp/terraform/internal/addrs"
@@ -39,6 +40,10 @@ func (g *Graph) walk(walker GraphWalker) tfdiags.Diagnostics {
 
 	// Walk the graph.
 	walkFn := func(v dag.Vertex) (diags tfdiags.Diagnostics) {
+		// the walkFn is called asynchronously, and needs to be recovered
+		// separately in the case of a panic.
+		defer logging.PanicHandler()
+
 		log.Printf("[TRACE] vertex %q: starting visit (%T)", dag.VertexName(v), v)
 
 		defer func() {

main.go

@@ -59,6 +59,8 @@ func main() {
 }
 
 func realMain() int {
+	defer logging.PanicHandler()
+
 	var err error
 
 	tmpLogPath := os.Getenv(envTmpLogPath)