Store: Panic in github.com/improbable-eng/thanos/pkg/store.(*lazyPostings).Next

[jdfalk]

Thanos, Prometheus and Golang version used
thanos, version 0.1.0-rc.2 (branch: HEAD, revision: ecfce89)
build user: jenkins@build
build date: 20180727-15:58:10
go version: go1.10.3

What happened
Thanos store crashes with panic: runtime error: invalid memory address or nil pointer dereference

What you expected to happen
Thanos store to not crash

How to reproduce it (as minimally and precisely as possible):

Full logs to relevant components
thanos-store-panic.log

Anything else we need to know:

Environment:

• OS (e.g. from /etc/os-release): CentOS Linux 7 (Core)
• Kernel (e.g. uname -a): 3.10.0-862.3.3.el7.x86_64
• Others:

[wleese]

I was able to reproduce this only briefly. At the time I was querying 7 days of non-compacted data (that is, the compactor wasn't enabled). The crashes only seemed to happen in the early lifetime of a thanos store process - once thanos store was running and failed to crash, it'd be solid. Most times it crashed within minutes of startup+querying.
Sorry for the vague information. If there's anything I can add I will.

[bwplotka]

Dup of #335

[bwplotka]

But still, more info = better (:

[bwplotka]

(closing because of duplication)