podman build --jobs 4(?) : panic: runtime error: invalid memory address or nil pointer dereference

[edsantiago]

This is a one-off. Only one instance, no reproducer, am filing as a placeholder in case I see it again:

 # $ podman build --no-cache --jobs 4 -t derived-mt -f /tmp/podman_bats.JKqL7z/build-test/Containerfile2 /tmp/podman_bats.JKqL7z/build-test
# STEP 1: FROM quay.io/libpod/alpine AS final
# STEP 2: FROM quay.io/libpod/testimage:20210427 AS test
# panic: runtime error: invalid memory address or nil pointer dereference
# [signal SIGSEGV: segmentation violation code=0x1 addr=0xa0 pc=0xd663d4]
# 
# goroutine 60 [running]:
# github.com/containers/storage.(*store).canUseShifting(0xc000342160, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0006c8e48)
# 	vendor/github.com/containers/storage/store.go:940 +0x34
# github.com/containers/storage.(*store).Mount(0xc000342160, 0xc0002a9d40, 0x40, 0xc00069e060, 0x2f, 0x0, 0x0, 0xc0006a7510, 0x0)
# 	vendor/github.com/containers/storage/store.go:2711 +0x265
# github.com/containers/buildah.(*Builder).Mount(0xc0004e6600, 0xc00069e060, 0x2f, 0x0, 0x0, 0xc0006a7510, 0x0)
# 	vendor/github.com/containers/buildah/mount.go:10 +0x6f
# github.com/containers/buildah/imagebuildah.(*StageExecutor).prepare(0xc000416000, 0x1eb0320, 0xc000266240, 0xc000049b90, 0x21, 0xd00101, 0x0, 0x0, 0x0, 0x0)
# 	vendor/github.com/containers/buildah/imagebuildah/stage_executor.go:622 +0xc65
# github.com/containers/buildah/imagebuildah.(*StageExecutor).Execute(0xc000416000, 0x1eb0320, 0xc000266240, 0xc000049b90, 0x21, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
# 	vendor/github.com/containers/buildah/imagebuildah/stage_executor.go:725 +0x465
# github.com/containers/buildah/imagebuildah.(*Executor).buildStage(0xc0005de000, 0x1eb0320, 0xc000266240, 0xc0005d0ff0, 0xc0000a9590, 0x2, 0x2, 0x0, 0x0, 0x0, ...)
# 	vendor/github.com/containers/buildah/imagebuildah/executor.go:443 +0x2ac
# github.com/containers/buildah/imagebuildah.(*Executor).Build.func3.1(0xc0005de000, 0xc0005b7940, 0x1eb0320, 0xc000266240, 0xc000010868, 0xc0000a9590, 0x2, 0x2, 0x0, 0xc000052d20)
# 	vendor/github.com/containers/buildah/imagebuildah/executor.go:612 +0x106
# created by github.com/containers/buildah/imagebuildah.(*Executor).Build.func3
# 	vendor/github.com/containers/buildah/imagebuildah/executor.go:609 +0xbc
# [ rc=2 (** EXPECTED 0 **) ]

sys: build with copy-from referencing the base image

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