Minimal repro case for vscode issue

.zshrc

export MOZCONFIG="$HOME/src/mozilla/mozconfigs/linux_debug_noopt"

mach

env

tasks.json

{
	// See http://go.microsoft.com/fwlink/?LinkId=733558
	// for the documentation about the tasks.json format
	"version": "0.3.2",
	"command": "./mach",
	"isShellCommand": true,
	"args": ["--log-no-times"],
  "options": {"cwd": "${workspaceRoot}", "env": {"NSPR_LOG_MODULES": "timestamp,nsHttp:5", "NSPR_LOG_FILE": "/tmp/nspr.log", "SSLKEYLOGFILE": "/tmp/nsskeys.log"}},
	"showOutput": "always",
    "tasks": [
        {
            "taskName": "Full Build",
            "suppressTaskName": true,
            "isBuildCommand": true,
            "args": ["build"],
            "problemMatcher": {
                "owner": "cpp",
                "fileLocation": "absolute",
                 "pattern": {
                    "regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$",
                    "file": 1,
                    "line": 2,
                    "column": 3,
                    "severity": 4,
                    "message": 5
                }
            }
        },
        {
            "taskName": "Binaries Build",
            "suppressTaskName": true,
            "args": ["build", "binaries"],
            "problemMatcher": {
                "owner": "cpp",
                "fileLocation": "absolute",
                 "pattern": {
                    "regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$",
                    "file": 1,
                    "line": 2,
                    "column": 3,
                    "severity": 4,
                    "message": 5
                }
            }
        },
        {
            "taskName": "Run with HTTP Logging",
            "suppressTaskName": true,
            "args": ["run"],
            "problemMatcher": {
                "owner": "cpp",
                "fileLocation": "absolute",
                "severity": "error",
                 "pattern": {
                    "regexp": "^Assertion failure: (.+), at ([a-zA-Z0-9+/.-_]+):([0-9]+)$"
                    "file": 2,
                    "line": 3,
                    "message": 1
                }
            }
        },
        {
            "taskName": "Clobber",
            "suppressTaskName": true,
            "args": ["clobber"]
        }
    ]
}