tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20200605-blktrace-fixes-v4 head: 1800ec543cd3a52ecb7ef550f81ad866710a2067 commit: 1800ec543cd3a52ecb7ef550f81ad866710a2067 [8/8] blktrace: fix debugfs use after free config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e429cffd4f228f70c1d9df0e5d77c08590dd9766) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 1800ec543cd3a52ecb7ef550f81ad866710a2067 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): { ^ kernel/trace/blktrace.c:627:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:642:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:673:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:715:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:740:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:786:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:799:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:820:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:845:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:867:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:874:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:882:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:889:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:907:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:925:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:932:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:940:1: error: function definition is not allowed here { ^ kernel/trace/blktrace.c:948:1: error: function definition is not allowed here { ^ fatal error: too many errors emitted, stopping now [-ferror-limit=] 20 errors generated. vim +605 kernel/trace/blktrace.c 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 602 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 603 static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 604 struct block_device *bdev, char __user *arg) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 @605 { 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 606 struct blk_user_trace_setup buts; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 607 int ret; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 608 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 609 ret = copy_from_user(&buts, arg, sizeof(buts)); 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 610 if (ret) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 611 return -EFAULT; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 612 d0deef5b14af7d kernel/trace/blktrace.c Shawn Du 2009-04-14 613 ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 614 if (ret) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 615 return ret; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 616 9a8c28c8311e30 kernel/trace/blktrace.c Dmitry Monakhov 2010-02-27 617 if (copy_to_user(arg, &buts, sizeof(buts))) { 2967acbb257a6a kernel/trace/blktrace.c Jens Axboe 2017-11-19 618 __blk_trace_remove(q); 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 619 return -EFAULT; 9a8c28c8311e30 kernel/trace/blktrace.c Dmitry Monakhov 2010-02-27 620 } 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 621 return 0; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 622 } 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 623 :::::: The code at line 605 was first introduced by commit :::::: 171044d449611c6e5040b37210ff6aba47f33ee4 compat_ioctl: handle blk_trace ioctls :::::: TO: Arnd Bergmann <arnd(a)arndb.de&gt; :::::: CC: Jens Axboe <axboe(a)carl.home.kernel.dk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org