Buildkit: containerd worker hanging

[AkihiroSuda]

containerd/containerd@a8426ed9e7855ff86b97d747ee807394ab792e77
moby/buildkit@537b5e459df179315802b4525fa2ba0adb0f4b3d

$ ./buildkit0 | sudo ./bin/buildctl --debug build
INFO[0000] tracing logs to /tmp/buildctl610568466
DEBU[0000] serving grpc connection
[+] Building 32.1s (2/19)
 => CACHED docker-image://docker.io/library/alpine:latest                                                                                                0.0s
 => => resolve docker.io/library/alpine:latest                                                                                                           2.1s
 => CACHED docker-image://docker.io/library/golang:1.8-alpine                                                                                            0.0s
 => => resolve docker.io/library/golang:1.8-alpine                                                                                                       2.1s
 => apk add --no-cache g++ linux-headers                                                                                                                32.1s

daemon log:

fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/community/x86_64/APKINDEX.tar.gz
(1/16) Installing libgcc (6.2.1-r1)
(2/16) Installing libstdc++ (6.2.1-r1)
(3/16) Installing binutils-libs (2.27-r1)
(4/16) Installing binutils (2.27-r1)
(5/16) Installing gmp (6.1.1-r0)
(6/16) Installing isl (0.17.1-r0)
(7/16) Installing libgomp (6.2.1-r1)
(8/16) Installing libatomic (6.2.1-r1)
(9/16) Installing pkgconf (1.0.2-r0)
(10/16) Installing mpfr3 (3.1.5-r0)
(11/16) Installing mpc1 (1.0.3-r0)
(12/16) Installing gcc (6.2.1-r1)
(13/16) Installing musl-dev (1.1.15-r7)
(14/16) Installing libc-dev (0.7-r1)
(15/16) Installing g++ (6.2.1-r1)
(16/16) Installing linux-headers (4.4.6-r1)
Executing busybox-1.25.1-r0.trigger
OK: 164 MiB in 28 packages

apk itself seems successfully completed

[kunalkushwaha]

This bug still exists. @AkihiroSuda if you are currently working on this, May I try ?

[AkihiroSuda]

I'll look into this issue after fixing up other PRs, but if you can look into the issue now, it would be appreciated :+1: