netdev - [PATCH net-next 00/19] net: add preliminary netdev refcount tracking

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Message-Id: <20211202032139.3156411-1-eric.dumazet@gmail.com>
Date:   Wed,  1 Dec 2021 19:21:20 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 00/19] net: add preliminary netdev refcount tracking

From: Eric Dumazet <edumazet@...gle.com>

Two first patches add a generic infrastructure, that will be used
to get tracking of refcount increments/decrements.

The general idea is to be able to precisely pair each decrement with
a corresponding prior increment. Both share a cookie, basically
a pointer to private data storing stack traces.

Then a series of 17 patches converts some dev_hold()/dev_put()
pairs to new hepers : dev_hold_track() and dev_put_track().

Hopefully this will be used by developpers and syzbot to
root cause bugs that cause netdevice dismantles freezes.

With CONFIG_PCPU_DEV_REFCNT=n option, we were able to detect
some class of bugs, but too late (when too many dev_put()
were happening).

Eric Dumazet (19):
  lib: add reference counting tracking infrastructure
  lib: add tests for reference tracker
  net: add dev_hold_track() and dev_put_track() helpers
  net: add net device refcount tracker to struct netdev_rx_queue
  net: add net device refcount tracker to struct netdev_queue
  net: add net device refcount tracker to ethtool_phys_id()
  net: add net device refcount tracker to dev_ifsioc()
  drop_monitor: add net device refcount tracker
  net: dst: add net device refcount tracking to dst_entry
  ipv6: add net device refcount tracker to rt6_probe_deferred()
  sit: add net device refcount tracking to ip_tunnel
  ipv6: add net device refcount tracker to struct ip6_tnl
  net: add net device refcount tracker to struct neighbour
  net: add net device refcount tracker to struct pneigh_entry
  net: add net device refcount tracker to struct neigh_parms
  net: add net device refcount tracker to struct netdev_adjacent
  ipv6: add net device refcount tracker to struct inet6_dev
  ipv4: add net device refcount tracker to struct in_device
  net/sched: add net device refcount tracker to struct Qdisc

 include/linux/inetdevice.h  |   2 +
 include/linux/netdevice.h   |  53 ++++++++++++++
 include/linux/ref_tracker.h |  73 +++++++++++++++++++
 include/net/devlink.h       |   3 +
 include/net/dst.h           |   1 +
 include/net/if_inet6.h      |   1 +
 include/net/ip6_tunnel.h    |   1 +
 include/net/ip_tunnels.h    |   3 +
 include/net/neighbour.h     |   3 +
 include/net/sch_generic.h   |   2 +-
 lib/Kconfig                 |   4 ++
 lib/Kconfig.debug           |  10 +++
 lib/Makefile                |   4 +-
 lib/ref_tracker.c           | 140 ++++++++++++++++++++++++++++++++++++
 lib/test_ref_tracker.c      | 116 ++++++++++++++++++++++++++++++
 net/Kconfig                 |   8 +++
 net/core/dev.c              |  10 ++-
 net/core/dev_ioctl.c        |   5 +-
 net/core/drop_monitor.c     |   4 +-
 net/core/dst.c              |   8 +--
 net/core/neighbour.c        |  18 ++---
 net/core/net-sysfs.c        |   8 +--
 net/ethtool/ioctl.c         |   5 +-
 net/ipv4/devinet.c          |   4 +-
 net/ipv4/route.c            |   7 +-
 net/ipv6/addrconf.c         |   4 +-
 net/ipv6/addrconf_core.c    |   2 +-
 net/ipv6/ip6_gre.c          |   8 +--
 net/ipv6/ip6_tunnel.c       |   4 +-
 net/ipv6/ip6_vti.c          |   4 +-
 net/ipv6/route.c            |  10 +--
 net/ipv6/sit.c              |   4 +-
 net/sched/sch_generic.c     |   4 +-
 33 files changed, 481 insertions(+), 52 deletions(-)
 create mode 100644 include/linux/ref_tracker.h
 create mode 100644 lib/ref_tracker.c
 create mode 100644 lib/test_ref_tracker.c

-- 
2.34.0.rc2.393.gf8c9666880-goog