tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.10 head: 9ced6633127bd25a94939777d9ecda54800859fc commit: 0b80f78d907debe5f8ba3cef42b659b89352310a [45/74] io_uring/io-wq: kill off now unused IO_WQ_WORK_NO_CANCEL config: nios2-defconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.10 git checkout 0b80f78d907debe5f8ba3cef42b659b89352310a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 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 >>): fs/io_uring.c: In function 'io_prep_async_work': fs/io_uring.c:1431:22: warning: variable 'id' set but not used [-Wunused-but-set-variable] 1431 | struct io_identity *id; | ^~ fs/io_uring.c: In function 'io_close': 4281 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; | ^~~~~~~~~~~~~~~~~~~~ | IO_WQ_WORK_CANCEL fs/io_uring.c:4281:22: note: each undeclared identifier is reported only once for each function it appears in vim +4281 fs/io_uring.c b5dba59e0cf7e2 Jens Axboe 2019-12-11 4264 229a7b63507a3e Jens Axboe 2020-06-22 4265 static int io_close(struct io_kiocb *req, bool force_nonblock, 229a7b63507a3e Jens Axboe 2020-06-22 4266 struct io_comp_state *cs) b5dba59e0cf7e2 Jens Axboe 2019-12-11 4267 { 3af73b286ccee4 Pavel Begunkov 2020-06-08 4268 struct io_close *close = &req->close; b5dba59e0cf7e2 Jens Axboe 2019-12-11 4269 int ret; b5dba59e0cf7e2 Jens Axboe 2019-12-11 4270 3af73b286ccee4 Pavel Begunkov 2020-06-08 4271 /* might be already done during nonblock submission */ 3af73b286ccee4 Pavel Begunkov 2020-06-08 4272 if (!close->put_file) { 3af73b286ccee4 Pavel Begunkov 2020-06-08 4273 ret = __close_fd_get_file(close->fd, &close->put_file); b5dba59e0cf7e2 Jens Axboe 2019-12-11 4274 if (ret < 0) 0bf0eefdab52d9 Pavel Begunkov 2020-05-26 4275 return (ret == -ENOENT) ? -EBADF : ret; 3af73b286ccee4 Pavel Begunkov 2020-06-08 4276 } b5dba59e0cf7e2 Jens Axboe 2019-12-11 4277 b5dba59e0cf7e2 Jens Axboe 2019-12-11 4278 /* if the file has a flush method, be safe and punt to async */ 3af73b286ccee4 Pavel Begunkov 2020-06-08 4279 if (close->put_file->f_op->flush && force_nonblock) { f3ac7a5996d7cd Jens Axboe 2021-01-19 4280 /* not safe to cancel at this point */ f3ac7a5996d7cd Jens Axboe 2021-01-19 @4281 req->work.flags |= IO_WQ_WORK_NO_CANCEL; 24c74678634b3c Pavel Begunkov 2020-06-21 4282 /* was never set, but play safe */ 24c74678634b3c Pavel Begunkov 2020-06-21 4283 req->flags &= ~REQ_F_NOWAIT; 0bf0eefdab52d9 Pavel Begunkov 2020-05-26 4284 /* avoid grabbing files - we don't need the files */ 24c74678634b3c Pavel Begunkov 2020-06-21 4285 req->flags |= REQ_F_NO_FILE_TABLE; 0bf0eefdab52d9 Pavel Begunkov 2020-05-26 4286 return -EAGAIN; b5dba59e0cf7e2 Jens Axboe 2019-12-11 4287 } b5dba59e0cf7e2 Jens Axboe 2019-12-11 4288 3af73b286ccee4 Pavel Begunkov 2020-06-08 4289 /* No ->flush() or already async, safely close from here */ 98447d65b4a7a5 Jens Axboe 2020-10-14 4290 ret = filp_close(close->put_file, req->work.identity->files); 3af73b286ccee4 Pavel Begunkov 2020-06-08 4291 if (ret < 0) 3af73b286ccee4 Pavel Begunkov 2020-06-08 4292 req_set_fail_links(req); 3af73b286ccee4 Pavel Begunkov 2020-06-08 4293 fput(close->put_file); 3af73b286ccee4 Pavel Begunkov 2020-06-08 4294 close->put_file = NULL; 229a7b63507a3e Jens Axboe 2020-06-22 4295 __io_req_complete(req, ret, 0, cs); a2100672f3b2af Pavel Begunkov 2020-03-02 4296 return 0; a2100672f3b2af Pavel Begunkov 2020-03-02 4297 } a2100672f3b2af Pavel Begunkov 2020-03-02 4298 :::::: The code at line 4281 was first introduced by commit :::::: f3ac7a5996d7cd739664c5f71cab4f8da03937e7 io_uring: fix SQPOLL IORING_OP_CLOSE cancelation state :::::: TO: Jens Axboe <axboe(a)kernel.dk&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org