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Increasing the swap file size really solves the «proc_open(): fork failed - Cannot allocate memory» failure Composer issue - Magento 2
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How to fix the «proc_open(): fork failed - Cannot allocate memory» failure on a Composer command? - Magento 2
Resource Error (fork failure): Cannot allocate memory · Issue #4971 · qutebrowser/qutebrowser · GitHub
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ErrorException: proc_open(): fork failed - Cannot allocate memory in phar · Issue #945 · composer/composer · GitHub
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