From: Philip Li <philip.li@intel.com>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: "kernel test robot" <lkp@intel.com>,
"Eric Dumazet" <edumazet@google.com>,
oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org,
"Jakub Kicinski" <kuba@kernel.org>,
"Maciej Żenczykowski" <maze@google.com>
Subject: Re: include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
Date: Mon, 12 Jan 2026 08:49:51 +0800 [thread overview]
Message-ID: <aWRFL4nDyNBIF032@rli9-mobl> (raw)
In-Reply-To: <20260110221508.GF3634291@ZenIV>
On Sat, Jan 10, 2026 at 10:15:08PM +0000, Al Viro wrote:
> On Sun, Jan 11, 2026 at 05:06:31AM +0800, kernel test robot wrote:
>
> Folks, could your bot be taught to recognize that kind of situation?
Got it, we will follow up to update the bot logic to ignore further
reports for this pattern.
> It's very clear what's going on - an inline function that gets the
> same warning with this config every time it is called. Commit in
> question has added several calls of that thing; the origin of warning
> has nothing whatsoever to do with it, and that can be guessed without
> even looking at the source - the quoted diff between the logs is quite
> enough for that.
>
> Looking at the function in question,
>
> > sparse warnings: (new ones prefixed by >>)
> > net/ipv4/datagram.c: note: in included file (through include/net/inet_sock.h, include/net/ip.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > --
> > net/ipv4/raw.c: note: in included file (through include/linux/mroute_base.h, include/linux/mroute.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > --
> > net/ipv4/inet_connection_sock.c:328:36: sparse: sparse: context imbalance in 'inet_csk_find_open_port' - wrong count at exit
> > net/ipv4/inet_connection_sock.c:605:23: sparse: sparse: context imbalance in 'inet_csk_get_port' - unexpected unlock
> > net/ipv4/inet_connection_sock.c: note: in included file (through include/net/inet_sock.h, include/net/inet_connection_sock.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > net/ipv4/inet_connection_sock.c:1467:9: sparse: sparse: context imbalance in 'inet_csk_complete_hashdance' - unexpected unlock
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > --
> > net/ipv4/route.c: note: in included file (through include/linux/mroute_base.h, include/linux/mroute.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > --
> > net/ipv4/ip_output.c: note: in included file (through include/net/inet_sock.h, include/net/ip.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > --
> > net/ipv4/af_inet.c: note: in included file (through include/net/inet_sock.h, include/net/ip.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > --
> > net/ipv4/tcp_ipv4.c:3415:41: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const *data @@ got struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control @@
> > net/ipv4/tcp_ipv4.c:3415:41: sparse: expected void const *data
> > net/ipv4/tcp_ipv4.c:3415:41: sparse: got struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control
> > net/ipv4/tcp_ipv4.c:3537:45: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const *data @@ got struct tcp_congestion_ops const [noderef] __rcu *extern [addressable] [toplevel] tcp_congestion_control @@
> > net/ipv4/tcp_ipv4.c:3537:45: sparse: expected void const *data
> > net/ipv4/tcp_ipv4.c:3537:45: sparse: got struct tcp_congestion_ops const [noderef] __rcu *extern [addressable] [toplevel] tcp_congestion_control
> > net/ipv4/tcp_ipv4.c:3541:50: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control @@ got struct tcp_congestion_ops * @@
> > net/ipv4/tcp_ipv4.c:3541:50: sparse: expected struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control
> > net/ipv4/tcp_ipv4.c:3541:50: sparse: got struct tcp_congestion_ops *
> > net/ipv4/tcp_ipv4.c: note: in included file (through include/net/inet_sock.h, include/net/icmp.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > net/ipv4/tcp_ipv4.c:1846:25: sparse: sparse: context imbalance in 'tcp_v4_syn_recv_sock' - unexpected unlock
> > net/ipv4/tcp_ipv4.c:2139:17: sparse: sparse: context imbalance in 'tcp_add_backlog' - unexpected unlock
> > net/ipv4/tcp_ipv4.c:2401:21: sparse: sparse: context imbalance in 'tcp_v4_rcv' - different lock contexts for basic block
> > net/ipv4/tcp_ipv4.c:2612:13: sparse: sparse: context imbalance in 'listening_get_first' - wrong count at exit
> > net/ipv4/tcp_ipv4.c:2660:29: sparse: sparse: context imbalance in 'listening_get_next' - unexpected unlock
> > net/ipv4/tcp_ipv4.c:2693:13: sparse: sparse: context imbalance in 'established_get_first' - wrong count at exit
> > net/ipv4/tcp_ipv4.c:2738:40: sparse: sparse: context imbalance in 'established_get_next' - unexpected unlock
> > net/ipv4/tcp_ipv4.c:2870:36: sparse: sparse: context imbalance in 'tcp_seq_stop' - unexpected unlock
> > net/ipv4/tcp_ipv4.c:3091:20: sparse: sparse: context imbalance in 'bpf_iter_tcp_listening_batch' - unexpected unlock
> > net/ipv4/tcp_ipv4.c:3119:40: sparse: sparse: context imbalance in 'bpf_iter_tcp_established_batch' - unexpected unlock
> > net/ipv4/tcp_ipv4.c:3416:41: sparse: sparse: dereference of noderef expression
> > net/ipv4/tcp_ipv4.c:3416:41: sparse: sparse: dereference of noderef expression
> > net/ipv4/tcp_ipv4.c:3538:45: sparse: sparse: dereference of noderef expression
> > net/ipv4/tcp_ipv4.c:3538:45: sparse: sparse: dereference of noderef expression
> > --
> > net/ipv4/ping.c: note: in included file (through include/net/inet_sock.h, include/net/ip.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > --
> > net/ipv4/udp.c: note: in included file (through include/linux/bpf-cgroup.h):
> > >> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
> > include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
> > net/ipv4/udp.c:1668:28: sparse: sparse: context imbalance in 'udp_rmem_release' - unexpected unlock
> > net/ipv4/udp.c:1700:19: sparse: sparse: context imbalance in 'busylock_acquire' - wrong count at exit
> > net/ipv4/udp.c:1712:28: sparse: sparse: context imbalance in 'busylock_release' - unexpected unlock
> > net/ipv4/udp.c:3305:9: sparse: sparse: context imbalance in 'udp_get_first' - wrong count at exit
> > net/ipv4/udp.c:3322:39: sparse: sparse: context imbalance in 'udp_get_next' - unexpected unlock
> > net/ipv4/udp.c:3370:31: sparse: sparse: context imbalance in 'udp_seq_stop' - unexpected unlock
> >
> > vim +2100 include/net/sock.h
> >
> > 2096
> > 2097 static inline kuid_t sk_uid(const struct sock *sk)
> > 2098 {
> > 2099 /* Paired with WRITE_ONCE() in sockfs_setattr() */
> > > 2100 return READ_ONCE(sk->sk_uid);
> > 2101 }
> > 2102
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
> >
>
next prev parent reply other threads:[~2026-01-12 0:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-10 21:06 include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar kernel test robot
2026-01-10 22:15 ` Al Viro
2026-01-10 22:35 ` Al Viro
2026-01-11 10:08 ` Eric Dumazet
2026-01-12 12:33 ` Peter Zijlstra
2026-01-11 18:20 ` Al Viro
2026-01-11 18:51 ` Al Viro
2026-01-12 12:37 ` Peter Zijlstra
2026-01-12 15:02 ` Will Deacon
2026-01-12 19:21 ` Al Viro
2026-01-12 21:16 ` Al Viro
2026-01-12 22:39 ` David Laight
2026-01-13 0:28 ` Al Viro
2026-01-12 12:32 ` Peter Zijlstra
2026-01-12 19:30 ` Al Viro
2026-01-13 15:27 ` Peter Zijlstra
2026-01-12 0:49 ` Philip Li [this message]
-- strict thread matches above, loose matches on Subject: below --
2025-12-06 10:09 kernel test robot
2025-08-25 4:45 kernel test robot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aWRFL4nDyNBIF032@rli9-mobl \
--to=philip.li@intel.com \
--cc=edumazet@google.com \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lkp@intel.com \
--cc=maze@google.com \
--cc=oe-kbuild-all@lists.linux.dev \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox