Sidekiq appears to kill big export jobs

Some big export jobs never finish and they seem to be killed, possibly by Sidekiq. An example is trying to export CE repo in gitlab.com

Relevant part of the log:

WARN: Work still in progress [<struct Sidekiq::BasicFetch::UnitOfWork queue="queue:gitlab_shell", job="{\"class\":\"ProjectExportWorker\",\"args\":[ID1,ID2],\"retry\":true,\"queue\":\"gitlab_shell\",\"jid\":\"a9c309ac09b5c688f24c56eb\",\"created_at\":1466687806.3562632,\"enqueued_at\":1466687806.3563974}">

We may have the same problem trying to import a big file.