tree: https://github.com/ammarfaizi2/linux-block axboe/linux-block/for-next head: 9c63ffcf47865ad2d20e09d6d6531c4611674cf1 commit: 1a75fac9a0f920a13418c88e4deaa9aa005381f5 [2/27] io_uring: avoid ring quiesce while registering/unregistering eventfd config: arm-randconfig-c002-20220213 (https://download.01.org/0day-ci/archive/20220214/202202140741.cSdNc5dQ-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ea071884b0cc7210b3cc5fe858f0e892a779a23b) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/ammarfaizi2/linux-block/commit/1a75fac9a0f920a13418c88... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block axboe/linux-block/for-next git checkout 1a75fac9a0f920a13418c88e4deaa9aa005381f5 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the ammarfaizi2-block/axboe/linux-block/for-next HEAD 9c63ffcf47865ad2d20e09d6d6531c4611674cf1 builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): return ret; ^~~ fs/io_uring.c:9384:13: note: initialize the variable 'ret' to silence this warning int fd, ret; ^ = 0 1 error generated. vim +/ret +9406 fs/io_uring.c 9379 9380 static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) 9381 { 9382 struct io_ev_fd *ev_fd; 9383 __s32 __user *fds = arg; 9384 int fd, ret; 9385 9386 ev_fd = rcu_dereference_protected(ctx->io_ev_fd, 9387 lockdep_is_held(&ctx->uring_lock)); 9388 if (ev_fd) 9389 return -EBUSY; 9390 9391 if (copy_from_user(&fd, fds, sizeof(*fds))) 9392 return -EFAULT; 9393 9394 ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL); 9395 if (!ev_fd) 9396 return -ENOMEM; 9397 9398 ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd); 9399 if (IS_ERR(ev_fd->cq_ev_fd)) { 9400 ret = PTR_ERR(ev_fd->cq_ev_fd); 9401 kfree(ev_fd); 9402 return ret; 9403 } 9404 9405 rcu_assign_pointer(ctx->io_ev_fd, ev_fd); 9407 } 9408 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org