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Message-ID: <20260110221508.GF3634291@ZenIV>
Date: Sat, 10 Jan 2026 22:15:08 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: kernel test robot <lkp@...el.com>
Cc: Eric Dumazet <edumazet@...gle.com>, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
Maciej Żenczykowski <maze@...gle.com>
Subject: Re: include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
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?
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
>
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