Re: [linux-next:master 11295/12552] cgroup.c:undefined reference to `bpf_trampoline_link_cgroup_shim'

[Stanislav Fomichev <sdf@google.com>]

On Mon, Jul 25, 2022 at 9:27 AM Stanislav Fomichev <sdf@google.com> wrote:
>
> On Sun, Jul 24, 2022 at 8:19 AM kernel test robot <lkp@intel.com> wrote:
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   18c107a1f120d095404d141dfad8f594bdc44020
> > commit: 3908fcddc65d04e069b03be49b33fae90e424631 [11295/12552] bpf: fix lsm_cgroup build errors on esoteric configs
> > config: x86_64-randconfig-a016-20220718 (https://download.01.org/0day-ci/archive/20220724/202207242322.9ymWznA0-lkp@intel.com/config)
> > compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
> > reproduce (this is a W=1 build):
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=3908fcddc65d04e069b03be49b33fae90e424631
> >         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> >         git fetch --no-tags linux-next master
> >         git checkout 3908fcddc65d04e069b03be49b33fae90e424631
> >         # save the config file
> >         mkdir build_dir && cp config build_dir/.config
> >         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
> >
> > If you fix the issue, kindly add following tag where applicable
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > Note: the linux-next/master HEAD 18c107a1f120d095404d141dfad8f594bdc44020 builds fine.
> >       It may have been fixed somewhere.
> >
> > All errors (new ones prefixed by >>):
> >
> >    ld: vmlinux.o: in function `cgroup_bpf_release':
> >    cgroup.c:(.text+0x22faf7): undefined reference to `bpf_trampoline_unlink_cgroup_shim'
> >    ld: cgroup.c:(.text+0x22fb46): undefined reference to `bpf_trampoline_unlink_cgroup_shim'
> >    ld: vmlinux.o: in function `__cgroup_bpf_attach':
> > >> cgroup.c:(.text+0x23039c): undefined reference to `bpf_trampoline_link_cgroup_shim'
> >    ld: cgroup.c:(.text+0x2303dd): undefined reference to `bpf_trampoline_unlink_cgroup_shim'
> >    ld: cgroup.c:(.text+0x230411): undefined reference to `bpf_trampoline_unlink_cgroup_shim'
> >    ld: vmlinux.o: in function `__cgroup_bpf_detach':
> >    cgroup.c:(.text+0x23096c): undefined reference to `bpf_trampoline_unlink_cgroup_shim'
> >    ld: vmlinux.o: in function `bpf_cgroup_link_release':
> >    cgroup.c:(.text+0x230a57): undefined reference to `bpf_trampoline_unlink_cgroup_shim'
>
> Hm, looks like [1] is not enough? I'll take another look..
>
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=9cb61fda8c71baaff423fe5be2e609100860fa78

With the config above:

$ git checkout 3908fcddc65d04e069b03be49b33fae90e424631
$ make
ld: vmlinux.o: in function `cgroup_bpf_release':
cgroup.c:(.text+0x22e8bf): undefined reference to
`bpf_trampoline_unlink_cgroup_shim'
ld: cgroup.c:(.text+0x22e90e): undefined reference to
`bpf_trampoline_unlink_cgroup_shim'
ld: vmlinux.o: in function `__cgroup_bpf_attach':
cgroup.c:(.text+0x22f164): undefined reference to
`bpf_trampoline_link_cgroup_shim'
ld: cgroup.c:(.text+0x22f1a5): undefined reference to
`bpf_trampoline_unlink_cgroup_shim'
ld: cgroup.c:(.text+0x22f1d9): undefined reference to
`bpf_trampoline_unlink_cgroup_shim'
ld: vmlinux.o: in function `__cgroup_bpf_detach':
cgroup.c:(.text+0x22f734): undefined reference to
`bpf_trampoline_unlink_cgroup_shim'
ld: vmlinux.o: in function `bpf_cgroup_link_release':
cgroup.c:(.text+0x22f81f): undefined reference to
`bpf_trampoline_unlink_cgroup_shim'
make: *** [Makefile:1164: vmlinux] Error 1

$ git checkout bpf-next
$ make olddefconfig
$ make
$

So seems fine? I'm assuming this failure is from the old next-20220722
and the latest linux-next is ok.

> > --
> > 0-DAY CI Kernel Test Service
> > https://01.org/lkp