netdev - Re: [PATCH v2 net-next 02/23] lib: add tests for reference tracker

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Date:   Sat, 4 Dec 2021 16:45:33 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, kbuild-all@...ts.01.org,
        netdev <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v2 net-next 02/23] lib: add tests for reference tracker

On Sat, Dec 4, 2021 at 3:40 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Eric,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on net-next/master]
>
> url:    https://github.com/0day-ci/linux/commits/Eric-Dumazet/net-add-preliminary-netdev-refcount-tracking/20211203-104930
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git fc993be36f9ea7fc286d84d8471a1a20e871aad4
> config: nios2-allyesconfig (https://download.01.org/0day-ci/archive/20211205/202112050729.hISLa0oF-lkp@intel.com/config)
> compiler: nios2-linux-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/0day-ci/linux/commit/98ad7e89138f4176a549203b6e23c2dc1cb9581d
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Eric-Dumazet/net-add-preliminary-netdev-refcount-tracking/20211203-104930
>         git checkout 98ad7e89138f4176a549203b6e23c2dc1cb9581d
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash
>

I tried following these instructions, but this failed on my laptop.


> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
>    lib/ref_tracker.c: In function 'ref_tracker_alloc':
> >> lib/ref_tracker.c:80:22: error: implicit declaration of function 'stack_trace_save'; did you mean 'stack_depot_save'? [-Werror=implicit-function-declaration]
>       80 |         nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
>          |                      ^~~~~~~~~~~~~~~~
>          |                      stack_depot_save
> >> lib/ref_tracker.c:81:22: error: implicit declaration of function 'filter_irq_stacks' [-Werror=implicit-function-declaration]
>       81 |         nr_entries = filter_irq_stacks(entries, nr_entries);
>          |                      ^~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors
>
> Kconfig warnings: (for reference only)
>    WARNING: unmet direct dependencies detected for REF_TRACKER
>    Depends on STACKTRACE_SUPPORT
>    Selected by
>    - TEST_REF_TRACKER && RUNTIME_TESTING_MENU && DEBUG_KERNEL
>

This seems to be a bug unrelated to this patch series.