Laravel queues getting "killed"

Sometimes when I'm sending over a large dataset to a Job, my queue worker exits abruptly.

// $taskmetas is an array with other arrays, each subsequent array having 90 properties.
$this->dispatch(new ProcessExcelData($excel_data, $taskmetas, $iteration, $storage_path));

The ProcessExcelData job class creates an excel file using the box/spout package.

• in the 1st example $taskmetas has 880 rows - works fine
• in the 2nd example $taskmetas has 10,000 rows - exits abruptly

1st example - queue output with a small dataset:

forge@user:~/myapp.com$ php artisan queue:work --tries=1
[2017-08-07 02:44:48] Processing: App\Jobs\ProcessExcelData
[2017-08-07 02:44:48] Processed:  App\Jobs\ProcessExcelData

2nd example - queue output with a large dataset:

forge@user:~/myapp.com$ php artisan queue:work --tries=1
[2017-08-07 03:18:47] Processing: App\Jobs\ProcessExcelData
Killed

I don't get any error messages, logs are empty, and the job doesn't appear in the failed_jobs table as with other errors. The time limit is set to 1 hour, and the memory limit to 2GBs.

Why are my queues abruptly quitting?

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