nicoster

This post shows an example of a BEAM process' core dump analysis to backtrack what was the root cause of its crash.

Start gdb by pointing out the BEAM executable that generated the core dump and the core dump file. Optionally, you can provide a directory with the VM's source code:

gdb erts-6.3/bin/beam.smp -core core.14747 -d /home/azureuser/otp_src_17.4/erts/emulator

gdb should tell you what caused the crash and where in code this happened:

nicoster

#
# %CopyrightBegin%
# 
# Copyright Ericsson AB 2005-2014. All Rights Reserved.
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0

nicoster

#!/usr/bin/env python3

import requests as httpc
import sys
import json

'''
API reference:
. https://docs.gitlab.com/ee/api/members.html#edit-a-member-of-a-group-or-project
. https://docs.gitlab.com/ce/api/projects.html#list-all-projects

nicoster

local ins = require 'inspect'

local function insert_prioq(prioq, el, freq, insert_after)

    for i, v in ipairs(prioq) do
        -- print('i:', i, ' v:', ins(v))
        if insert_after then
            if freq < v[2] then
                table.insert(prioq, i, {el, freq})
                -- print(ins(prioq))

nicoster

#!/usr/bin/swift

// fix build errors with Swift 5. 
// Known issues: some resolution is not HiDPI

import Foundation

var shouldPrintUsage = true
var shouldPrintModes = true
var shouldSwitchMode = false

nicoster

#import <Foundation/Foundation.h>
#include <CoreFoundation/CoreFoundation.h>

void onNotifyCallback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo) {
    NSString* notifyName = (NSString*)name;
    if ([notifyName isEqualToString:@"com.apple.system.config.network_change"]) {
        // Get the path to the shell script from the command line
        NSArray *arguments = [[NSProcessInfo processInfo] arguments];
        if (arguments.count > 1) {
            NSString *shellScriptPath = [arguments objectAtIndex:1];