sql: v21.2.4: unknown describe type: PrepareType

[cockroach-teamcity]

This issue was autofiled by Sentry. It represents a crash or reported error on a live cluster with telemetry enabled.

Sentry link: https://sentry.io/organizations/cockroach-labs/issues/3341859878/?referrer=webhooks_plugin

Panic message:

conn_executor_prepare.go:559: unknown describe type: PrepareType(0)
--
*errutil.leafError: unknown describe type: PrepareType(0) (1)
conn_executor_prepare.go:559: *withstack.withStack (top exception)
*assert.withAssertionFailure
(check the extra data payloads)

Stacktrace (expand for inline code snippets):

cockroach/pkg/sql/conn_executor_prepare.go

Lines 558 to 560 in 0c8df44

	default:
	return retErr(errors.AssertionFailedf(
	"unknown describe type: %s", errors.Safe(descCmd.Type)))

in pkg/sql.(*connExecutor).execDescribe

cockroach/pkg/sql/conn_executor.go

Lines 1802 to 1804 in 0c8df44

	res = descRes
	ev, payload = ex.execDescribe(ctx, tcmd, descRes)
	case BindStmt:

in pkg/sql.(*connExecutor).execCmd

cockroach/pkg/sql/conn_executor.go

Lines 1630 to 1632 in 0c8df44

	var err error
	if err = ex.execCmd(ex.Ctx()); err != nil {
	if errors.IsAny(err, io.EOF, errDrainingComplete) {

in pkg/sql.(*connExecutor).run

cockroach/pkg/sql/conn_executor.go

Lines 669 to 671 in 0c8df44

	}()
	return h.ex.run(ctx, s.pool, reserved, cancel)
	}

in pkg/sql.(*Server).ServeConn

cockroach/pkg/sql/pgwire/conn.go

Lines 647 to 649 in 0c8df44

	reservedOwned = false // We're about to pass ownership away.
	retErr = sqlServer.ServeConn(ctx, connHandler, reserved, cancelConn)
	}()

in pkg/sql/pgwire.(*conn).processCommandsAsync.func1
/usr/local/go/src/runtime/asm_amd64.s#L1370-L1372 in runtime.goexit

pkg/sql/conn_executor_prepare.go in pkg/sql.(*connExecutor).execDescribe at line 559
pkg/sql/conn_executor.go in pkg/sql.(*connExecutor).execCmd at line 1803
pkg/sql/conn_executor.go in pkg/sql.(*connExecutor).run at line 1631
pkg/sql/conn_executor.go in pkg/sql.(*Server).ServeConn at line 670
pkg/sql/pgwire/conn.go in pkg/sql/pgwire.(*conn).processCommandsAsync.func1 at line 648
/usr/local/go/src/runtime/asm_amd64.s in runtime.goexit at line 1371

Tag	Value
Cockroach Release	v21.2.4
Cockroach SHA:	0c8df44
Platform	darwin amd64
Distribution	CCL
Environment	development
Command	start-single-node
Go Version	``
# of CPUs
# of Goroutines

Jira issue: CRDB-16660
Epic CRDB-14049

[rafiss]

We should be able to change this to a user-friendly error instead of an assertion error