wiredtiger-perf-ckpt-lsm failing

The wiredtiger-perf-ckpt-lsm job is failing.

It follows the patches for:
SERVER-18829 Have pages start in the middle of the LRU queue for eviction. (commit: 32144696f78cf726b8b1df8becca0a86d870efa3)
Only update the oldest read generation once we have some pages in the queue. (commit: 21c88f54c24045fef963dbb413bae1ca97f312a9)

The issue in question is a panic due to:

max latency exceeded: threshold 2000000 read max 16361 insert max 853 update max 16734347 Error: WT_PANIC: WiredTiger library panic