Hi Vincenzo,
First bad commit (maybe != root cause):
tree:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: b10b8ad862118bf42c28a98b0f067619aadcfb23
commit: 89b94df9dfb16fe29f9d2085b0a98116dc34d814 [4594/9623] arm64: mte: Kconfig entry
config: arm64-randconfig-s032-20200921 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce:
wget
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.2-201-g24bdaac6-dirty
git checkout 89b94df9dfb16fe29f9d2085b0a98116dc34d814
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
sparse warnings: (new ones prefixed by >>)
> arch/arm64/kernel/mte.c:297:38: sparse: sparse: incompatible
types in comparison expression (different address spaces):
> arch/arm64/kernel/mte.c:297:38: sparse: struct task_struct *
> arch/arm64/kernel/mte.c:297:38: sparse: struct task_struct [noderef] __rcu *
#
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi...
git remote add linux-next
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git fetch --no-tags linux-next master
git checkout 89b94df9dfb16fe29f9d2085b0a98116dc34d814
vim +297 arch/arm64/kernel/mte.c
18ddbaa02b7a64f Catalin Marinas 2020-03-30 282
18ddbaa02b7a64f Catalin Marinas 2020-03-30 283 /*
18ddbaa02b7a64f Catalin Marinas 2020-03-30 284 * Copy MTE tags in another process'
address space at 'addr' to/from tracer's
18ddbaa02b7a64f Catalin Marinas 2020-03-30 285 * iovec buffer. Return 0 on success.
Inspired by ptrace_access_vm().
18ddbaa02b7a64f Catalin Marinas 2020-03-30 286 */
18ddbaa02b7a64f Catalin Marinas 2020-03-30 287 static int access_remote_tags(struct
task_struct *tsk, unsigned long addr,
18ddbaa02b7a64f Catalin Marinas 2020-03-30 288 struct iovec *kiov, unsigned int
gup_flags)
18ddbaa02b7a64f Catalin Marinas 2020-03-30 289 {
18ddbaa02b7a64f Catalin Marinas 2020-03-30 290 struct mm_struct *mm;
18ddbaa02b7a64f Catalin Marinas 2020-03-30 291 int ret;
18ddbaa02b7a64f Catalin Marinas 2020-03-30 292
18ddbaa02b7a64f Catalin Marinas 2020-03-30 293 mm = get_task_mm(tsk);
18ddbaa02b7a64f Catalin Marinas 2020-03-30 294 if (!mm)
18ddbaa02b7a64f Catalin Marinas 2020-03-30 295 return -EPERM;
18ddbaa02b7a64f Catalin Marinas 2020-03-30 296
18ddbaa02b7a64f Catalin Marinas 2020-03-30 @297 if (!tsk->ptrace || (current !=
tsk->parent) ||
18ddbaa02b7a64f Catalin Marinas 2020-03-30 298 ((get_dumpable(mm) !=
SUID_DUMP_USER) &&
18ddbaa02b7a64f Catalin Marinas 2020-03-30 299 !ptracer_capable(tsk,
mm->user_ns))) {
18ddbaa02b7a64f Catalin Marinas 2020-03-30 300 mmput(mm);
18ddbaa02b7a64f Catalin Marinas 2020-03-30 301 return -EPERM;
18ddbaa02b7a64f Catalin Marinas 2020-03-30 302 }
18ddbaa02b7a64f Catalin Marinas 2020-03-30 303
18ddbaa02b7a64f Catalin Marinas 2020-03-30 304 ret = __access_remote_tags(mm, addr,
kiov, gup_flags);
18ddbaa02b7a64f Catalin Marinas 2020-03-30 305 mmput(mm);
18ddbaa02b7a64f Catalin Marinas 2020-03-30 306
18ddbaa02b7a64f Catalin Marinas 2020-03-30 307 return ret;
18ddbaa02b7a64f Catalin Marinas 2020-03-30 308 }
18ddbaa02b7a64f Catalin Marinas 2020-03-30 309
:::::: The code at line 297 was first introduced by commit
:::::: 18ddbaa02b7a64f4cf3e7e3d4b78b8b70481a17b arm64: mte: ptrace: Add
PTRACE_{PEEK,POKE}MTETAGS support
:::::: TO: Catalin Marinas <catalin.marinas(a)arm.com>
:::::: CC: Catalin Marinas <catalin.marinas(a)arm.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org