jthemphill

cmake_minimum_required(VERSION 3.12)

# A reproduction of the example given in
# https://cmake.org/cmake/help/latest/command/target_link_libraries.html#linking-object-libraries
project(CMakeTest)

# Object Libraries may be used as the <target> (first) argument of target_link_libraries to specify dependencies of their sources on other libraries. For example, the code

add_library(A SHARED a.c)
target_compile_definitions(A PUBLIC A)

jthemphill

import collections

horiz_edges = [
    [">", "<", ">", ">"],
    ["<", " ", "<", ">"],
    [">", ">", "<", " "],
    ["<", " ", ">", "<"],
    [" ", " ", ">", ">"],
]
assert len(horiz_edges) == 5

jthemphill

use rayon::prelude::*;
use std::io::BufRead;

fn edit_distance(s1: &str, s2: &str) -> usize {
    if s1.len() > s2.len() {
        return edit_distance(s2, s1);
    }

    let mut distances: Vec<usize> = (0..=s1.len()).collect();
    for (i2, c2) in s2.chars().enumerate() {

jthemphill

Summary

• The thread that holds s_sharedDataMutex is calling WatchmanConnection::close()
• WatchmanConnection::close() needs to run something in the EventBaseThread
• The EventBaseThread is in a callback that's trying to get s_sharedDataMutex
• This is a deadlock.

Event Base Thread

jthemphill

2021-11-02 13:41:47 837839: Setting mount namespace failed. Errno: 22
2021-11-02 13:41:47 837906: Target pid: 425995 (inside container: 425995)
2021-11-02 13:41:47 841508: Reading process symbols..
2021-11-02 13:41:48 189050: Gathering stack traces..
2021-11-02 13:41:48 233281: Printing stack traces..
2021-11-02 13:41:48 233298: Total Traced Time: 35.196 milliseconds
2021-11-02 13:41:48 233306: Average Traced Time Per LWP:  0.109 milliseconds
2021-11-02 13:41:48 233310: Longest Traced LWP: LWP 4047257,  0.528 milliseconds

Thread 323 (LWP 4122695):

jthemphill

------------------------------- MODULE facts -------------------------------

EXTENDS Integers

CONSTANTS
    NumFiles,
    NumTypes,
    NumRequests,
    FinalClock

jthemphill

// % g++ --std=c++14 accidentalcopy.cc -o accidentalcopy
// % ./accidentalcopy
// This prints the output:
//
// 42 = 42
// 42 = 42
// accidentalcopy(13656,0x117fc45c0) malloc: *** error for object 0x7fd967402b20: pointer being freed was not allocated
// accidentalcopy(13656,0x117fc45c0) malloc: *** set a breakpoint in malloc_error_break to debug

#include <iostream>

jthemphill

	.section	__TEXT,__text,regular,pure_instructions
	.globl	__ZN10slow_iters5tests8iter_any17h9958878595c8e553E
	.p2align	4, 0x90
__ZN10slow_iters5tests8iter_any17h9958878595c8e553E:
	.cfi_startproc
	pushq	%rbp
Lcfi0:
	.cfi_def_cfa_offset 16
Lcfi1:
	.cfi_offset %rbp, -16

jthemphill

// WARNING: This output format is intended for human consumers only
// and is subject to change without notice. Knock yourself out.
fn tests::iter_any::{{closure}}(_1: &mut [closure@src/lib.rs:4:24: 4:35], _2: &i32) -> bool {
    let mut _0: bool;                    // return pointer
    scope 1 {
        let _3: i32;                     // "x" in scope 1 at src/lib.rs:4:26: 4:27
    }
    let mut _4: i32;

    bb0: {

jthemphill

; ModuleID = 'slow_iters.cgu-0.rs'
source_filename = "slow_iters.cgu-0.rs"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-darwin"

%"unwind::libunwind::_Unwind_Exception" = type { i64, [0 x i8], void (i32, %"unwind::libunwind::_Unwind_Exception"*)*, [0 x i8], [6 x i64], [0 x i8] }
%"unwind::libunwind::_Unwind_Context" = type {}

@ref.5 = internal unnamed_addr constant [1 x i32] [i32 1], align 4