There is a memory corruption issue somewhere in the following commit range:
b9e7961...a328bc5

The crash signatures are not consistent, but when it first happened I was pretty sure it was somehow related to e293ffb.

However, I reverted that, and we are still seeing crashes. (I also spent 2 hours looking at the code and it seems fine.)

Given the changes in the above range, I think the next most likely candidate is the histogram change: 9a1e49f

I'm going to spend time today digging into this, but I wanted to open this in case anyone else wants to scan through the diffs and help with bug spotting.

cc @envoyproxy/maintainers @jmarantz @mrice32 @ramaraochavali