add gdbme flag that starting erigon under gdb (for debug) (#13874)

closes #13586

---------

Co-authored-by: JkLondon <ilya@mikheev.fun>

cmd/utils/flags.go

@@ -1121,6 +1121,11 @@ var (
 		Name:  "polygon.pos.ssf.block",
 		Usage: "Enabling Polygon PoS Single Slot Finality since block",
 	}
+	GDBMeFlag = cli.BoolFlag{
+		Name:  "gdbme",
+		Usage: "restart erigon under gdb for debug purposes",
+		Value: false,
+	}
 )
 
 var MetricFlags = []cli.Flag{&MetricsEnabledFlag, &MetricsHTTPFlag, &MetricsPortFlag, &DiagDisabledFlag, &DiagEndpointAddrFlag, &DiagEndpointPortFlag, &DiagSpeedTestFlag}

core/gdbme/gdbme.go

@@ -0,0 +1,52 @@
+package gdbme
+
+import (
+	"fmt"
+	"github.com/erigontech/erigon/cmd/utils"
+	"os"
+	"os/exec"
+)
+
+const gdbPath = "/usr/bin/gdb"
+
+// restartUnderGDB relaunches the current process under GDB for debugging purposes.
+func RestartUnderGDB() {
+	exePath, err := os.Executable()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Error: could not determine executable path:", err)
+		os.Exit(1)
+	}
+
+	args := os.Args[1:]
+	filteredArgs := []string{}
+	for _, arg := range args {
+		if arg != "--"+utils.GDBMeFlag.Name {
+			filteredArgs = append(filteredArgs, arg)
+		}
+	}
+
+	gdbArgs := []string{
+		"-q",
+		"-batch",
+		"-nx",
+		"-nh",
+		"-return-child-result",
+		"-ex", "run",
+		"-ex", "bt full",
+		"--args",
+		exePath,
+	}
+	gdbArgs = append(gdbArgs, filteredArgs...)
+
+	fmt.Fprintln(os.Stderr, "Restarting under GDB for crash diagnostics...")
+	cmd := exec.Command(gdbPath, gdbArgs...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = os.Stdin
+
+	err = cmd.Run()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Failed to restart under GDB:", err)
+		os.Exit(1)
+	}
+}

turbo/cli/default_flags.go

@@ -244,4 +244,5 @@ var DefaultFlags = []cli.Flag{
 
 	&utils.PolygonPosSingleSlotFinalityFlag,
 	&utils.PolygonPosSingleSlotFinalityBlockAtFlag,
+	&utils.GDBMeFlag,
 }

turbo/node/node.go

@@ -17,14 +17,18 @@
 // Package node contains classes for running an Erigon node.
 package node
 
+/*
+#include <stdlib.h>
+*/
+import "C"
+
 import (
 	"context"
-
-	"github.com/urfave/cli/v2"
-
 	"github.com/erigontech/erigon-lib/chain/networkname"
 	"github.com/erigontech/erigon-lib/kv"
 	"github.com/erigontech/erigon-lib/log/v3"
+	"github.com/erigontech/erigon/core/gdbme"
+	"github.com/urfave/cli/v2"
 
 	"github.com/erigontech/erigon/cmd/utils"
 	"github.com/erigontech/erigon/eth"
@@ -114,6 +118,11 @@ func NewNodConfigUrfave(ctx *cli.Context, logger log.Logger) (*nodecfg.Config, e
 		return nil, err
 	}
 	erigoncli.ApplyFlagsForNodeConfig(ctx, nodeConfig, logger)
+
+	if ctx.Bool(utils.GDBMeFlag.Name) {
+		gdbme.RestartUnderGDB()
+	}
+
 	return nodeConfig, nil
 }
 func NewEthConfigUrfave(ctx *cli.Context, nodeConfig *nodecfg.Config, logger log.Logger) *ethconfig.Config {