Our Evergreen CI is showing a test failure when running with memory sanitizer. The failure is:

[2020/02/13 11:12:51.094] cursor->modify timed out
[2020/02/13 11:12:51.094] FAIL test_wt4105_large_doc_small_upd (exit status: 134)

This could be the same as WT-4453, but it seems much more reliably on the durable history branch, so we should investigate more urgently.