[kbuild-all] Re: [ebiederm-user-namespace:signal-for-v5.17 4/12] arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to next function show_opcodes()

On 12/15/21 12:48, Eric W. Biederman wrote: > Rong Chen <rong.a.chen(a)intel.com&gt; writes: > >> On 12/15/21 01:29, Eric W. Biederman wrote: >>> kernel test robot <lkp(a)intel.com&gt; writes: >>> >>>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git signal-for-v5.17 >>>> head: 6b1248798eb6f6d5285db214299996ecc5dc1e6b >>>> commit: 0e25498f8cd43c1b5aa327f373dd094e9a006da7 [4/12] exit: Add and use make_task_dead. >>>> config: x86_64-randconfig-a011-20211213 (https://download.01.org/0day-ci/archive/20211214/202112140949.Uq5sFKR1-lk...) >>>> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 >>>> reproduce (this is a W=1 build): >>>> # https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.g... >>>> git remote add ebiederm-user-namespace https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git >>>> git fetch --no-tags ebiederm-user-namespace signal-for-v5.17 >>>> git checkout 0e25498f8cd43c1b5aa327f373dd094e9a006da7 >>>> # save the config file to linux build tree >>>> mkdir build_dir >>>> make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/ kernel/ lib/kunit/ >>>> >>>> If you fix the issue, kindly add following tag as appropriate >>>> Reported-by: kernel test robot <lkp(a)intel.com&gt; >>>> >>>> All warnings (new ones prefixed by >>): >>>> >>>>>> lib/kunit/kunit-example-test.o: warning: objtool: .text.unlikely: unexpected end of section >>>> -- >>>>>> arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to next function show_opcodes() >>> I am confused. This change patches objtool to rename >>> rewind_stack_and_do_exit to rewind_stack_and_make_dead in the list >>> global_noreturns in tools/objtool/check.c >>> >>> There is no other change to oops_end other than that renaming. >>> >>> Did the robot somehow mange to run an old version of objtool while >>> building and this get this error? >>> >>> I tried and I am not currently able to reproduce this error. Do you >>> have any additional pointers on how I might reproduce this? >> Hi Eric, >> >> The reproduce step in report based on a full build, I can reproduce >> the warnings with the below command: >> >>   make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash > Any chance you could do "make arch/x86/kernel/dumpstack.s" and send it > to me? $ make O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/dumpstack.s make[1]: Entering directory '/mnt/memdrive/linux/build_dir'   GEN     Makefile   CALL    ../scripts/checksyscalls.sh   CALL    ../scripts/atomic/check-atomics.sh   DESCEND objtool   CC      arch/x86/kernel/dumpstack.s make[1]: Leaving directory '/mnt/memdrive/linux/build_dir' $ make O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/ make[1]: Entering directory '/mnt/memdrive/linux/build_dir'   GEN     Makefile   CALL    ../scripts/checksyscalls.sh   CALL    ../scripts/atomic/check-atomics.sh   DESCEND objtool   CC      arch/x86/kernel/dumpstack.o arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to next function show_opcodes()   AR      arch/x86/kernel/built-in.a make[1]: Leaving directory '/mnt/memdrive/linux/build_dir'