From: kernel test robot <lkp@intel.com>
To: Eric Dumazet <edumazet@google.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: oe-kbuild-all@lists.linux.dev, Simon Horman <horms@kernel.org>,
netdev@vger.kernel.org, eric.dumazet@gmail.com,
Eric Dumazet <edumazet@google.com>,
syzbot+a5a07d2f6a71972dc5ed@syzkaller.appspotmail.com
Subject: Re: [PATCH net] igmp: convert struct ip_sf_list to RCU
Date: Thu, 27 Aug 2026 16:13:25 +0800 [thread overview]
Message-ID: <202608271655.mXCyurGJ-lkp@intel.com> (raw)
In-Reply-To: <20260826115913.3381537-1-edumazet@google.com>
Hi Eric,
kernel test robot noticed the following build warnings:
[auto build test WARNING on net/main]
url: https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/igmp-convert-struct-ip_sf_list-to-RCU/20260826-115913
base: net/main
patch link: https://lore.kernel.org/r/20260826115913.3381537-1-edumazet%40google.com
patch subject: [PATCH net] igmp: convert struct ip_sf_list to RCU
config: i386-randconfig-062-20260827 (https://download.01.org/0day-ci/archive/20260827/202608271655.mXCyurGJ-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260827/202608271655.mXCyurGJ-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608271655.mXCyurGJ-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
net/ipv4/igmp.c: note: in included file (through include/linux/igmp.h):
include/uapi/linux/igmp.h:60:32: sparse: sparse: array of flexible structures
>> net/ipv4/igmp.c:3114:13: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ip_sf_list *psf @@ got struct ip_sf_list [noderef] __rcu *sf_next @@
net/ipv4/igmp.c:3114:13: sparse: expected struct ip_sf_list *psf
net/ipv4/igmp.c:3114:13: sparse: got struct ip_sf_list [noderef] __rcu *sf_next
>> net/ipv4/igmp.c:3130:21: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ip_sf_list *psf @@ got struct ip_sf_list [noderef] __rcu *sources @@
net/ipv4/igmp.c:3130:21: sparse: expected struct ip_sf_list *psf
net/ipv4/igmp.c:3130:21: sparse: got struct ip_sf_list [noderef] __rcu *sources
net/ipv4/igmp.c:3098:29: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ip_sf_list *psf @@ got struct ip_sf_list [noderef] __rcu *sources @@
net/ipv4/igmp.c:3098:29: sparse: expected struct ip_sf_list *psf
net/ipv4/igmp.c:3098:29: sparse: got struct ip_sf_list [noderef] __rcu *sources
net/ipv4/igmp.c:3098:29: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ip_sf_list *psf @@ got struct ip_sf_list [noderef] __rcu *sources @@
net/ipv4/igmp.c:3098:29: sparse: expected struct ip_sf_list *psf
net/ipv4/igmp.c:3098:29: sparse: got struct ip_sf_list [noderef] __rcu *sources
vim +3114 net/ipv4/igmp.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 3109
^1da177e4c3f41 Linus Torvalds 2005-04-16 3110 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
^1da177e4c3f41 Linus Torvalds 2005-04-16 3111 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 3112 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
^1da177e4c3f41 Linus Torvalds 2005-04-16 3113
^1da177e4c3f41 Linus Torvalds 2005-04-16 @3114 psf = psf->sf_next;
^1da177e4c3f41 Linus Torvalds 2005-04-16 3115 while (!psf) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 3116 spin_unlock_bh(&state->im->lock);
^1da177e4c3f41 Linus Torvalds 2005-04-16 3117 state->im = state->im->next;
^1da177e4c3f41 Linus Torvalds 2005-04-16 3118 while (!state->im) {
6baff15037693c Eric Dumazet 2009-11-11 3119 state->dev = next_net_device_rcu(state->dev);
^1da177e4c3f41 Linus Torvalds 2005-04-16 3120 if (!state->dev) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 3121 state->idev = NULL;
^1da177e4c3f41 Linus Torvalds 2005-04-16 3122 goto out;
^1da177e4c3f41 Linus Torvalds 2005-04-16 3123 }
6baff15037693c Eric Dumazet 2009-11-11 3124 state->idev = __in_dev_get_rcu(state->dev);
^1da177e4c3f41 Linus Torvalds 2005-04-16 3125 if (!state->idev)
^1da177e4c3f41 Linus Torvalds 2005-04-16 3126 continue;
1d7138de878d1d Eric Dumazet 2010-11-12 3127 state->im = rcu_dereference(state->idev->mc_list);
^1da177e4c3f41 Linus Torvalds 2005-04-16 3128 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 3129 spin_lock_bh(&state->im->lock);
^1da177e4c3f41 Linus Torvalds 2005-04-16 @3130 psf = state->im->sources;
^1da177e4c3f41 Linus Torvalds 2005-04-16 3131 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 3132 out:
^1da177e4c3f41 Linus Torvalds 2005-04-16 3133 return psf;
^1da177e4c3f41 Linus Torvalds 2005-04-16 3134 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 3135
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2026-08-27 8:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-26 11:59 [PATCH net] igmp: convert struct ip_sf_list to RCU Eric Dumazet
2026-08-27 8:13 ` kernel test robot [this message]
2026-08-27 8:54 ` Eric Dumazet
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