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

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Date:   Sat, 4 Dec 2021 19:14:19 -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 4:45 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> 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.

Ah... maybe I got the Kconfig thing wrong.

This is hard to believe we will have to duplicate " depends on
STACKTRACE_SUPPORT" for all trackers
will intend to have (I have a series for netns refcount tracking)

diff --git a/net/Kconfig b/net/Kconfig
index 0b665e60b53490f44eeda1e5506d4e125ef4c53a..b54e233b8dd38ea153ac3500df1e8a2557097ba6
100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -255,6 +255,7 @@ config PCPU_DEV_REFCNT

 config NET_DEV_REFCNT_TRACKER
        bool "Enable tracking in dev_put_track() and dev_hold_track()"
+       depends on STACKTRACE_SUPPORT
        select REF_TRACKER
        default n
        help



I thought that having the dependency centralized in REF_TRACKER would
be enough really ?

config REF_TRACKER
        bool
        depends on STACKTRACE_SUPPORT
        select STACKDEPOT