GOFLAGS="-buildmode=pie" leads to segfaulting executable on 386

[zmedico]

This issue was originally reported in https://bugs.gentoo.org/917577, and I was able to reproduce it in the 386 version of the debian:unstable-20231030 docker image, like this:

# Select the 386 version of debian:unstable-20231030 by sha256 hash.
FROM docker.io/library/debian@sha256:fc007e931599ce93e8feb29ce52c5a750e387f195670938c7023716189522a36
RUN apt update && \
	apt install -y golang git make && 
	git clone --depth=1 https://github.com/prometheus/promu.git /tmp/promu && \
	env GOFLAGS="-buildmode=pie" make -C /tmp/promu build && \
	/tmp/promu/promu

The make command exits "successfully" after emitting a message like this:

# github.com/prometheus/promu
loadinternal: cannot find runtime/cgo

The resulting executable segfaults regardless of arguments:

# /tmp/promu/promu 
Segmentation fault (core dumped)

[zmedico]

If I enable the promu builld --cgo option or set go.cgo true in .promu.yml, then it suppresses the issue.

[zmedico]

If I enable the promu builld --cgo option or set go.cgo true in .promu.yml, then it suppresses the issue.

However, with cgo enabled, the resulting executable is not a pie executable:

# file /tmp/promu/promu
/tmp/promu/promu: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, BuildID[sha1]=89ffa6bf6408eee0c5e1ca0ca3ee8e2121227088, for GNU/Linux 3.2.0, stripped

And the build emits these warnings:

GO111MODULE= /root/go/bin/promu build --prefix /tmp/promu
 >   promu
# github.com/prometheus/promu
/usr/bin/ld: /tmp/go-link-2178255396/000002.o: in function `mygetgrouplist':
/_/GOROOT/src/os/user/getgrouplist_unix.go:15:(.text+0x29): warning: Using 'getgrouplist' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /tmp/go-link-2178255396/000001.o: in function `mygetgrgid_r':
/_/GOROOT/src/os/user/cgo_lookup_cgo.go:45:(.text+0x5d): warning: Using 'getgrgid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /tmp/go-link-2178255396/000001.o: in function `mygetgrnam_r':
/_/GOROOT/src/os/user/cgo_lookup_cgo.go:54:(.text+0x11d): warning: Using 'getgrnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /tmp/go-link-2178255396/000001.o: in function `mygetpwnam_r':
/_/GOROOT/src/os/user/cgo_lookup_cgo.go:36:(.text+0x1e9): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /tmp/go-link-2178255396/000001.o: in function `mygetpwuid_r':
/_/GOROOT/src/os/user/cgo_lookup_cgo.go:27:(.text+0x2e9): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

[zmedico]

When tried adding -buildmode=pie to build.flags in .promu.yml (as suggested in #158), results were no different than when it was specified via GOFLAGS.

[zmedico]

Also see golang/go#47949.