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Re: [Libguestfs] Build failure of libnbd



On Sat, Oct 17, 2020 at 09:00:30AM +0100, Richard W.M. Jones wrote:
On Sat, Oct 17, 2020 at 08:48:40AM +0100, Richard W.M. Jones wrote:
[Adding libguestfs mailing list]

I reproduced it locally - the difference was installing "gcc-go".
I only had golang-bin installed previously.  With gcc-go installed:

  ../run go install libguestfs.org/libnbd
  write of Go pointer 0xc000016060 to non-Go memory 0x7f5fe8297390
  fatal error: Go pointer stored into non-Go memory

  runtime stack:
  runtime_mstart
  	../../../libgo/runtime/proc.c:593

Notice that these two packages both provide /usr/bin/go, using
alternatives:

  $ rpm -qf /usr/bin/go
  golang-bin-1.15.3-1.fc34.x86_64
  gcc-go-10.2.1-5.fc34.x86_64
  $ ll /usr/bin/go
  lrwxrwxrwx. 1 root root 20 Oct 15 12:46 /usr/bin/go -> /etc/alternatives/go

So the easy fix is to remove gcc-go from your Dockerfile.

However I will take a look at why gcc-go doesn't work, as I guess we
ought to try to support both, or if gcc-go cannot work then we ought
to reject it in ./configure.

nbdkit-golang-plugin also fails to build with gcc-go:

cd examples/disk && \
PKG_CONFIG_PATH="/home/rjones/d/nbdkit/server/local${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}" \
GOPATH="/home/rjones/d/nbdkit/plugins/golang" \
go build -o nbdkit-godisk-plugin.so -buildmode=c-shared
# _/home/rjones/d/nbdkit/plugins/golang/examples/disk
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/10/libgolibbegin.a(libgolibbegin_a-go-libmain.o): undefined reference to symbol 'pthread_create@@GLIBC_2.2.5'
/usr/bin/ld: /usr/lib64/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

Even adding -pthread didn't help here.  I guess gcc-go is just broken.


Could be, thanks a lot for figuring it out, I hope the time is not wasted and it
at least helps someone somewhere... at some point.

The list of packages is something I will have to go through anyway, for not it
is just a list taken from libvirt CI container with bunch of things added for
libnbd.  The ultimate goal with this is to have automatically updated repository
like libnbd-go that looks exactly how golang developers want it so that they can
consume it the usual way and it should also be properly tagged whenever a tag is
updated in the upstream repository.  The fact that there are some checks
shouldn't hurt, right? ;-)

Rich.

--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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