Docker 18.09.7 nil pointer panic in builder-next/adapters/containerimage.(*cachedResolver).Resolve

I am using `Docker version 18.09.7, build 2d0083d` on `raspbian` buster, installed by adding debian buster’s mirror to my raspberry pi 3B+ and its `linux` kernel version is 4.19.57-v7+.

I ran the following `Dockerfile` in the build dir with command `env DOCKER_BUILDKIT=1 docker build .`:

```
# syntax=docker/dockerfile:experimental
FROM debian:buster AS base

USER root

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && apt-get dist-upgrade

RUN apt-get install -y less clang build-essential perl cmake ctags git findutils htop curl wget libmicrohttpd-dev ca-certificates automake autoconf
```

given that `docker image ls -a` shows no image, the command failed with following output:

```
 [+] Building 0.1s (2/3)
 => [internal] load build definition from Dockerfile                                                                                   0.1s
 => => transferring dockerfile: 38B                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                      0.0s
 => => transferring context: 2B                                                                                                        0.0s
 => resolve image config for docker.io/docker/dockerfile:experimental                                                                  0.0s
unexpected EOF
```

Edit:

`journalctl _SYSTEMD_UNIT=docker.service`:

```

Jul 16 15:42:24 raspberrypi dockerd[23085]: time="2019-07-16T15:42:24.092638991+10:00" level=info msg="parsed scheme: \"\"" module=grpc
Jul 16 15:42:24 raspberrypi dockerd[23085]: time="2019-07-16T15:42:24.092911750+10:00" level=info msg="scheme \"\" not registered, fallback to default scheme" module=grpc
Jul 16 15:42:24 raspberrypi dockerd[23085]: time="2019-07-16T15:42:24.093154874+10:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{ 0  <nil>}]" module=grpc
Jul 16 15:42:24 raspberrypi dockerd[23085]: time="2019-07-16T15:42:24.093226436+10:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Jul 16 15:42:24 raspberrypi dockerd[23085]: time="2019-07-16T15:42:24.093358311+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x1414c470, CONNECTING" module=grpc
Jul 16 15:42:24 raspberrypi dockerd[23085]: time="2019-07-16T15:42:24.093801226+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x1414c470, READY" module=grpc
Jul 16 15:42:24 raspberrypi dockerd[23085]: panic: runtime error: invalid memory address or nil pointer dereference
Jul 16 15:42:24 raspberrypi dockerd[23085]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x4 pc=0x8fb848]
Jul 16 15:42:24 raspberrypi dockerd[23085]: goroutine 254 [running]:
Jul 16 15:42:24 raspberrypi dockerd[23085]: sync/atomic.addUint64(0x143ac28c, 0x1, 0x0, 0x13caf710, 0x0)
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /usr/local/go/src/sync/atomic/64bit_arm.go:31 +0x4c
Jul 16 15:42:24 raspberrypi dockerd[23085]: github.com/docker/docker/builder/builder-next/adapters/containerimage.(*cachedResolver).Resolve(0x143ac270, 0x24893b8, 0x14332ee0, 0x13caf710, 0x28, 0x28, 0x0, 0x0, 0x0, 0x0, ...)
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /go/src/github.com/docker/docker/builder/builder-next/adapters/containerimage/pull.go:819 +0x44
Jul 16 15:42:24 raspberrypi dockerd[23085]: github.com/docker/docker/vendor/github.com/moby/buildkit/util/imageutil.Config(0x24893b8, 0x14332ee0, 0x13caf530, 0x28, 0x247f258, 0x143ac270, 0x758c3330, 0x13c9f4b8, 0x0, 0xffffffff, ...)
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/imageutil/config.go:50 +0x624
Jul 16 15:42:24 raspberrypi dockerd[23085]: github.com/docker/docker/builder/builder-next/adapters/containerimage.(*imageSource).resolveRemote.func1(0x24893b8, 0x14332ee0, 0x1635c01, 0x8c57d4, 0x142a60e4, 0x8fd87c)
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /go/src/github.com/docker/docker/builder/builder-next/adapters/containerimage/pull.go:138 +0xd8
Jul 16 15:42:24 raspberrypi dockerd[23085]: github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.(*call).run(0x143083c0)
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol/flightcontrol.go:116 +0x54
Jul 16 15:42:24 raspberrypi dockerd[23085]: github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.(*call).(github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.run)-fm()
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol/flightcontrol.go:142 +0x1c
Jul 16 15:42:24 raspberrypi dockerd[23085]: sync.(*Once).Do(0x143083f0, 0x14156c88)
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /usr/local/go/src/sync/once.go:44 +0xc0
Jul 16 15:42:24 raspberrypi dockerd[23085]: created by github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.(*call).wait
Jul 16 15:42:24 raspberrypi dockerd[23085]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol/flightcontrol.go:142 +0x158
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26+10:00" level=warning msg="Running experimental build"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.626638800+10:00" level=info msg="User namespaces: ID ranges will be mapped to subuid/subgid ranges of: dockremap:dockremap"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.638120733+10:00" level=info msg="User namespaces: ID ranges will be mapped to subuid/subgid ranges of: dockremap:dockremap"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.640750305+10:00" level=info msg="parsed scheme: \"unix\"" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.640864315+10:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.641045721+10:00" level=info msg="parsed scheme: \"unix\"" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.641089471+10:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.642097904+10:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{unix:///run/containerd/containerd.sock 0  <nil>}]" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.642245924+10:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.642098321+10:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{unix:///run/containerd/containerd.sock 0  <nil>}]" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.642395090+10:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.642592486+10:00" level=info msg="blockingPicker: the picked transport is not ready, loop back to repick" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.642607538+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x13954160, CONNECTING" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.642727902+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x1380c020, CONNECTING" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.647605642+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x13954160, READY" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.647605799+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x1380c020, READY" module=grpc
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.660240279+10:00" level=info msg="[graphdriver] using prior storage driver: overlay2"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.669077796+10:00" level=info msg="Graph migration to content-addressability took 0.00 seconds"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.670275968+10:00" level=warning msg="Your kernel does not support swap memory limit"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.670450915+10:00" level=warning msg="Your kernel does not support cgroup cfs period"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.670508780+10:00" level=warning msg="Your kernel does not support cgroup cfs quotas"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.670564613+10:00" level=warning msg="Your kernel does not support cgroup rt period"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.670620185+10:00" level=warning msg="Your kernel does not support cgroup rt runtime"
Jul 16 15:42:26 raspberrypi dockerd[23348]: time="2019-07-16T15:42:26.672410803+10:00" level=info msg="Loading containers: start."
Jul 16 15:42:28 raspberrypi dockerd[23348]: time="2019-07-16T15:42:28.520257644+10:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferred IP address"
Jul 16 15:42:29 raspberrypi dockerd[23348]: time="2019-07-16T15:42:29.040586750+10:00" level=info msg="Loading containers: done."
Jul 16 15:42:29 raspberrypi dockerd[23348]: time="2019-07-16T15:42:29.172152523+10:00" level=info msg="Docker daemon" commit=2d0083d graphdriver(s)=overlay2 version=18.09.7
Jul 16 15:42:29 raspberrypi dockerd[23348]: time="2019-07-16T15:42:29.172570281+10:00" level=info msg="Daemon has completed initialization"
Jul 16 15:42:29 raspberrypi dockerd[23348]: time="2019-07-16T15:42:29.242873176+10:00" level=info msg="API listen on /var/run/docker.sock"
Jul 16 15:43:36 raspberrypi dockerd[23348]: time="2019-07-16T15:43:36.716249991+10:00" level=info msg="parsed scheme: \"\"" module=grpc
Jul 16 15:43:36 raspberrypi dockerd[23348]: time="2019-07-16T15:43:36.716642438+10:00" level=info msg="scheme \"\" not registered, fallback to default scheme" module=grpc
Jul 16 15:43:36 raspberrypi dockerd[23348]: time="2019-07-16T15:43:36.717230977+10:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{ 0  <nil>}]" module=grpc
Jul 16 15:43:36 raspberrypi dockerd[23348]: time="2019-07-16T15:43:36.717407174+10:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Jul 16 15:43:36 raspberrypi dockerd[23348]: time="2019-07-16T15:43:36.717680402+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x13ffe090, CONNECTING" module=grpc
Jul 16 15:43:36 raspberrypi dockerd[23348]: time="2019-07-16T15:43:36.718333212+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x13ffe090, READY" module=grpc
Jul 16 15:43:36 raspberrypi dockerd[23348]: panic: runtime error: invalid memory address or nil pointer dereference
Jul 16 15:43:36 raspberrypi dockerd[23348]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x4 pc=0x870848]
Jul 16 15:43:36 raspberrypi dockerd[23348]: goroutine 271 [running]:
Jul 16 15:43:36 raspberrypi dockerd[23348]: sync/atomic.addUint64(0x1409366c, 0x1, 0x0, 0x13dc4fc0, 0x0)
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /usr/local/go/src/sync/atomic/64bit_arm.go:31 +0x4c
Jul 16 15:43:36 raspberrypi dockerd[23348]: github.com/docker/docker/builder/builder-next/adapters/containerimage.(*cachedResolver).Resolve(0x14093650, 0x23fe3b8, 0x140b3460, 0x13dc4fc0, 0x28, 0x28, 0x0, 0x0, 0x0, 0x0, ...)
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /go/src/github.com/docker/docker/builder/builder-next/adapters/containerimage/pull.go:819 +0x44
Jul 16 15:43:36 raspberrypi dockerd[23348]: github.com/docker/docker/vendor/github.com/moby/buildkit/util/imageutil.Config(0x23fe3b8, 0x140b3460, 0x13dc4ea0, 0x28, 0x23f4258, 0x14093650, 0x7477e5d0, 0x14096008, 0x0, 0xffffffff, ...)
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/imageutil/config.go:50 +0x624
Jul 16 15:43:36 raspberrypi dockerd[23348]: github.com/docker/docker/builder/builder-next/adapters/containerimage.(*imageSource).resolveRemote.func1(0x23fe3b8, 0x140b3460, 0x15aac01, 0x83a7d4, 0x1386ee64, 0x87287c)
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /go/src/github.com/docker/docker/builder/builder-next/adapters/containerimage/pull.go:138 +0xd8
Jul 16 15:43:36 raspberrypi dockerd[23348]: github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.(*call).run(0x13ce7360)
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol/flightcontrol.go:116 +0x54
Jul 16 15:43:36 raspberrypi dockerd[23348]: github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.(*call).(github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.run)-fm()
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol/flightcontrol.go:142 +0x1c
Jul 16 15:43:36 raspberrypi dockerd[23348]: sync.(*Once).Do(0x13ce7390, 0x14096a68)
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /usr/local/go/src/sync/once.go:44 +0xc0
Jul 16 15:43:36 raspberrypi dockerd[23348]: created by github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol.(*call).wait
Jul 16 15:43:36 raspberrypi dockerd[23348]:         /go/src/github.com/docker/docker/vendor/github.com/moby/buildkit/util/flightcontrol/flightcontrol.go:142 +0x158
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39+10:00" level=warning msg="Running experimental build"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.383369323+10:00" level=info msg="User namespaces: ID ranges will be mapped to subuid/subgid ranges of: dockremap:dockremap"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.393847667+10:00" level=info msg="User namespaces: ID ranges will be mapped to subuid/subgid ranges of: dockremap:dockremap"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.396396979+10:00" level=info msg="parsed scheme: \"unix\"" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.396572083+10:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.396790728+10:00" level=info msg="parsed scheme: \"unix\"" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.396834894+10:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.397782703+10:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{unix:///run/containerd/containerd.sock 0  <nil>}]" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.397934317+10:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.397782599+10:00" level=info msg="ccResolverWrapper: sending new addresses to cc: [{unix:///run/containerd/containerd.sock 0  <nil>}]" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.398084525+10:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.400933836+10:00" level=info msg="blockingPicker: the picked transport is not ready, loop back to repick" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.398096764+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x1518a750, CONNECTING" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.398213066+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x14d422e0, CONNECTING" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.402643673+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x14d422e0, READY" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.403431951+10:00" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0x1518a750, READY" module=grpc
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.415979037+10:00" level=info msg="[graphdriver] using prior storage driver: overlay2"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.424669887+10:00" level=info msg="Graph migration to content-addressability took 0.00 seconds"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.426025559+10:00" level=warning msg="Your kernel does not support swap memory limit"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.426204569+10:00" level=warning msg="Your kernel does not support cgroup cfs period"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.426261912+10:00" level=warning msg="Your kernel does not support cgroup cfs quotas"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.426316808+10:00" level=warning msg="Your kernel does not support cgroup rt period"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.426377224+10:00" level=warning msg="Your kernel does not support cgroup rt runtime"
Jul 16 15:43:39 raspberrypi dockerd[23490]: time="2019-07-16T15:43:39.428230758+10:00" level=info msg="Loading containers: start."
Jul 16 15:43:41 raspberrypi dockerd[23490]: time="2019-07-16T15:43:41.190706678+10:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferred IP address"
Jul 16 15:43:41 raspberrypi dockerd[23490]: time="2019-07-16T15:43:41.740015003+10:00" level=info msg="Loading containers: done."
Jul 16 15:43:41 raspberrypi dockerd[23490]: time="2019-07-16T15:43:41.878263616+10:00" level=info msg="Docker daemon" commit=2d0083d graphdriver(s)=overlay2 version=18.09.7
Jul 16 15:43:41 raspberrypi dockerd[23490]: time="2019-07-16T15:43:41.878795854+10:00" level=info msg="Daemon has completed initialization"
Jul 16 15:43:41 raspberrypi dockerd[23490]: time="2019-07-16T15:43:41.924573483+10:00" level=info msg="API listen on /var/run/docker.sock"
```

I tried to `docker pull docker.io/docker/dockerfile:experimental` before running the command again, and this time the output is:

```
[+] Building 1.1s (6/6) FINISHED
 => [internal] load build definition from Dockerfile                                                                                   0.1s
 => => transferring dockerfile: 38B                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                      0.0s
 => => transferring context: 2B                                                                                                        0.0s
 => resolve image config for docker.io/docker/dockerfile:experimental                                                                  0.0s
 => CACHED docker-image://docker.io/docker/dockerfile:experimental                                                                     0.0s
 => [internal] load build definition from Dockerfile                                                                                   0.0s
 => => transferring dockerfile: 474B                                                                                                   0.0s
 => [internal] load .dockerignore                                                                                                      0.0s
unexpected EOF
```

so I touched `.dockerignore` and tried again:

```
[+] Building 1.9s (6/7)
 => [internal] load .dockerignore                                                                                                      0.1s
 => => transferring context: 34B                                                                                                       0.0s
 => [internal] load build definition from Dockerfile                                                                                   0.1s
 => => transferring dockerfile: 38B                                                                                                    0.0s
 => resolve image config for docker.io/docker/dockerfile:experimental                                                                  0.0s
 => CACHED docker-image://docker.io/docker/dockerfile:experimental                                                                     0.0s
 => [internal] load build definition from Dockerfile                                                                                   0.6s
 => => transferring dockerfile: 38B                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                      0.0s
 => [internal] load metadata for docker.io/library/debian:buster                                                                       0.0s
unexpected EOF
```

after pulling `debian:buster`, it seemed that everything is all right at first, but still failed:

```
 [+] Building 381.2s (8/10)
 => [internal] load build definition from Dockerfile                                                                                   0.2s
 => => transferring dockerfile: 38B                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                      0.2s
 => => transferring context: 32B                                                                                                       0.0s
 => resolve image config for docker.io/docker/dockerfile:experimental                                                                  0.0s
 => CACHED docker-image://docker.io/docker/dockerfile:experimental                                                                     0.0s
 => [internal] load build definition from Dockerfile                                                                                   0.1s
 => => transferring dockerfile: 38B                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                      0.0s
 => [internal] load metadata for docker.io/library/debian:buster                                                                       0.0s
 => [1/3] FROM docker.io/library/debian:buster                                                                                         0.0s
 => => resolve docker.io/library/debian:buster                                                                                         0.0s
 => [2/3] RUN apt-get update && apt-get dist-upgrade                                                                                 378.7s
unexpected EOF
```

Also, when I tried to run a more advanced `Dockerfile` with `detect-apt-proxy.sh`:

`detect-apt-proxy.sh`:

```
#!/bin/bash -ex
# see:
# https://github.com/sameersbn/docker-apt-cacher-ng
# https://gist.github.com/dergachev/8441335

APT_PROXY_PORT=$1
HOST_IP=$(awk '/^[a-z]+[0-9]+\t00000000/ { printf("%d.%d.%d.%d\n", "0x" substr($3, 7, 2), "0x" substr($3, 5, 2), "0x" substr($3, 3, 2), "0x" substr($3, 1, 2)) }' < /proc/net/route)

if [[ ! -z "$APT_PROXY_PORT" ]] && [[ ! -z "$HOST_IP" ]]; then
    echo 'Acquire::HTTPS::Proxy "false";' >> /etc/apt/apt.conf.d/01proxy
    cat >> /etc/apt/apt.conf.d/01proxy <<EOL
    Acquire::HTTP::Proxy "http://${HOST_IP}:${APT_PROXY_PORT}";
    Acquire::HTTPS::Proxy "false";
EOL
    cat /etc/apt/apt.conf.d/01proxy
    echo "Using host's apt proxy"
else
    echo "No squid-deb-proxy detected on docker host"
fi
```

`Dockerfile`:

```
# syntax=docker/dockerfile:experimental
FROM debian:buster AS base

USER root

ENV DEBIAN_FRONTEND=noninteractive

# This code is adapted from:
#     https://gist.github.com/dergachev/8441335#gistcomment-2007024
## When installed using `apt install squid-deb-proxy`, it listens on port 8000 on the host by dfault.
ARG APT_PROXY_PORT=8000
COPY detect-apt-proxy.sh /root
RUN /root/detect-apt-proxy.sh ${APT_PROXY_PORT}


RUN apt-get update && apt-get dist-upgrade

RUN apt-get install -y less clang build-essential perl cmake ctags git findutils htop curl wget libmicrohttpd-dev ca-certificates automake autoconf
```

the build failed immediately with:

```
[+] Building 1.8s (9/14)
 => [internal] load build definition from Dockerfile                                                                                   0.1s
 => => transferring dockerfile: 681B                                                                                                   0.0s
 => [internal] load .dockerignore                                                                                                      0.2s
 => => transferring context: 34B                                                                                                       0.0s
 => resolve image config for docker.io/docker/dockerfile:experimental                                                                  0.0s
 => CACHED docker-image://docker.io/docker/dockerfile:experimental                                                                     0.0s
 => [internal] load .dockerignore                                                                                                      0.0s
 => [internal] load build definition from Dockerfile                                                                                   0.1s
 => => transferring dockerfile: 681B                                                                                                   0.0s
 => [internal] load metadata for docker.io/library/debian:buster                                                                       0.0s
 => [1/3] FROM docker.io/library/debian:buster                                                                                         0.0s
 => => resolve docker.io/library/debian:buster                                                                                         0.0s
 => [internal] load build context                                                                                                      0.0s
unexpected EOF
```

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Docker 18.09.7 nil pointer panic in builder-next/adapters/containerimage.(*cachedResolver).Resolve #1079

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Docker 18.09.7 nil pointer panic in builder-next/adapters/containerimage.(*cachedResolver).Resolve #1079

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