linux-kernel - kernel/trace/bpf_trace.c:3619:52: sparse: sparse: cast removes address space '_

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Message-ID: <202601131740.6C3BdBaB-lkp@intel.com>
Date: Tue, 13 Jan 2026 17:17:20 +0800
From: kernel test robot <lkp@...el.com>
To: Mykyta Yatsenko <yatsenko@...a.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 Alexei Starovoitov <ast@...nel.org>,
 Andrii Nakryiko <andrii@...nel.org>
Subject: kernel/trace/bpf_trace.c:3619:52: sparse: sparse: cast
 removes address space '__user' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b71e635feefc852405b14620a7fc58c4c80c0f73
commit: a498ee7576de24b4b0916ce56cf2686e261a29f7 bpf: Implement dynptr copy kfuncs
date:   8 months ago
config: i386-randconfig-063-20260113 (https://download.01.org/0day-ci/archive/20260113/202601131740.6C3BdBaB-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/20260113/202601131740.6C3BdBaB-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/202601131740.6C3BdBaB-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/trace/bpf_trace.c:835:41: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __user *[addressable] [assigned] [usertype] sival_ptr @@     got void * @@
   kernel/trace/bpf_trace.c:835:41: sparse:     expected void [noderef] __user *[addressable] [assigned] [usertype] sival_ptr
   kernel/trace/bpf_trace.c:835:41: sparse:     got void *
>> kernel/trace/bpf_trace.c:3619:52: sparse: sparse: cast removes address space '__user' of expression
   kernel/trace/bpf_trace.c:3633:56: sparse: sparse: cast removes address space '__user' of expression
   kernel/trace/bpf_trace.c:3647:52: sparse: sparse: cast removes address space '__user' of expression
   kernel/trace/bpf_trace.c:3654:56: sparse: sparse: cast removes address space '__user' of expression
   kernel/trace/bpf_trace.c:3662:52: sparse: sparse: cast removes address space '__user' of expression
   kernel/trace/bpf_trace.c:3670:56: sparse: sparse: cast removes address space '__user' of expression
   kernel/trace/bpf_trace.c: note: in included file (through include/linux/rbtree.h, include/linux/mm_types.h, include/linux/mmzone.h, ...):
   include/linux/rcupdate.h:871:25: sparse: sparse: context imbalance in 'uprobe_prog_run' - unexpected unlock

vim +/__user +3619 kernel/trace/bpf_trace.c

  3615	
  3616	__bpf_kfunc int bpf_probe_read_user_dynptr(struct bpf_dynptr *dptr, u32 off,
  3617						   u32 size, const void __user *unsafe_ptr__ign)
  3618	{
> 3619		return __bpf_dynptr_copy(dptr, off, size, (const void *)unsafe_ptr__ign,
  3620					 copy_user_data_nofault, NULL);
  3621	}
  3622	

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