Allowed memory size of 1610612736 bytes exhausted when updating via CLI on OS X This one has been bugging me for months. 

My development environment is running on MAMP on OS X. It's worked absolutely find for ages but for no reason that I can identify all my Craft sites now throw the following error when trying to apply updates via the craft cli:

./craft update craft

[snip]

Performing update with Composer ... PHP Fatal Error 'yii\base\ErrorException' with message 'Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes)'



Doesn't matter how much memory I give php, it will always eat it all up, exmaple of silly about of memory:

php -i | grep memory
memory_limit =&gt; 2048M =&gt; 2048


It will run for a good 2-3 minutes before throwing the error.

I assumed there was something odd with my local environment so held on as I was reloading the mac, but the issue has followed me to a fresh install.

I did notices the number of bytes it refers too is ~1.6GB, this figure doesn't change with php cli's memory limit, for example if I drop the limit to 512MB I get the same allowed memory size figure, which suggests to me there is another php binary in play here, but I don't know enough about how the craft cli works to troubleshoot that.

When this happens, in most cases I can complete the update using composer, but it's a hack that I don't want to continue with.  

Versions are as follows:

Craft: All 3.1 and above, possibly 3.0 too but can't confirm
Mamp: 5.51
php cli: 7.2.21
Composer: 1.9.0
OS X: 10.14

Any ideas on how to troubleshoot this further?
This ended up being a bug in Craft that was fixed in https://github.com/craftcms/cms/commit/df40f585cef3d7e47f811f73b08d9d71bbc9c9b2 and will be included in the next (3.3.14) release.