vmlinux.o: error: objtool: folio_zero_user+0x85e: unknown CFA base reg -1

vmlinux.o: error: objtool: folio_zero_user+0x85e: unknown CFA base reg -1

[kernel test robot]

:::::: 
:::::: Manual check reason: "only suspicious fbc files changed"
:::::: 

BCC: lkp@intel.com
CC: llvm@lists.linux.dev
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Josh Poimboeuf <jpoimboe@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   89a312991dc6e638a36adc43ccb91dbc25504c04
commit: 1fd1dc41724319406b0aff221a352a400b0ddfc5 objtool: Fix ERROR_INSN() error message
date:   6 months ago
:::::: branch date: 32 hours ago
:::::: commit date: 6 months ago
config: x86_64-buildonly-randconfig-004-20260829 (https://download.01.org/0day-ci/archive/20260903/202609031256.d7zjEQWu-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260903/202609031256.d7zjEQWu-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
| Fixes: 1fd1dc417243 ("objtool: Fix ERROR_INSN() error message")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202609031256.d7zjEQWu-lkp@intel.com/

All errors (new ones prefixed by >>):

   vmlinux.o: warning: objtool: ___bpf_prog_run+0x20c: sibling call from callable instruction with modified stack frame
   vmlinux.o: warning: objtool: folio_zero_user+0x897: undefined stack state
>> vmlinux.o: error: objtool: folio_zero_user+0x85e: unknown CFA base reg -1

--
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https://github.com/intel/lkp-tests/wiki