linux-kernel - kernel/nsproxy.c:264:9: sparse: sparse: dereference of noderef expression

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Message-ID: <202512181002.T1MzUgAK-lkp@intel.com>
Date: Thu, 18 Dec 2025 11:06:35 +0800
From: kernel test robot <lkp@...el.com>
To: Christian Brauner <brauner@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: kernel/nsproxy.c:264:9: sparse: sparse: dereference of noderef
 expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ea1013c1539270e372fc99854bc6e4d94eaeff66
commit: 3a18f809184bc5a1cfad7cde5b8b026e2ff61587 ns: add active reference count
date:   6 weeks ago
config: i386-randconfig-061-20251218 (https://download.01.org/0day-ci/archive/20251218/202512181002.T1MzUgAK-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251218/202512181002.T1MzUgAK-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512181002.T1MzUgAK-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/nsproxy.c:264:9: sparse: sparse: no generic selection for 'struct user_namespace *const [noderef] __rcu user_ns'
   kernel/nsproxy.c:269:9: sparse: sparse: no generic selection for 'struct user_namespace *const [noderef] __rcu user_ns'
>> kernel/nsproxy.c:264:9: sparse: sparse: dereference of noderef expression
   kernel/nsproxy.c:269:9: sparse: sparse: dereference of noderef expression

vim +264 kernel/nsproxy.c

   261	
   262	void get_cred_namespaces(struct task_struct *tsk)
   263	{
 > 264		ns_ref_active_get(tsk->real_cred->user_ns);
   265	}
   266	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki