tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.10 head: 9ced6633127bd25a94939777d9ecda54800859fc commit: 107abcc47e3a96c38ab38e48dbd55f19c0a1c257 [64/74] io_uring: inline io_read()'s iovec freeing config: parisc-randconfig-r004-20210318 (attached as .config) compiler: hppa-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 107abcc47e3a96c38ab38e48dbd55f19c0a1c257 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 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_read': 3462 | goto out_free; | ^~~~ fs/io_uring.c:3427:3: error: label 'copy_iov' used but not defined 3427 | goto copy_iov; | ^~~~ fs/io_uring.c: In function 'io_close': fs/io_uring.c:4266:22: error: 'IO_WQ_WORK_NO_CANCEL' undeclared (first use in this function); did you mean 'IO_WQ_WORK_CANCEL'? 4266 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; | ^~~~~~~~~~~~~~~~~~~~ | IO_WQ_WORK_CANCEL fs/io_uring.c:4266:22: note: each undeclared identifier is reported only once for each function it appears in fs/io_uring.c: In function 'io_wq_submit_work': fs/io_uring.c:6091:3: error: implicit declaration of function 'io_req_task_work_add_fallback'; did you mean 'io_req_task_work_add'? [-Werror=implicit-function-declaration] 6091 | io_req_task_work_add_fallback(req, io_req_task_cancel); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | io_req_task_work_add fs/io_uring.c:6092:3: error: 'return' with no value, in function returning non-void [-Werror=return-type] 6092 | return; | ^~~~~~ fs/io_uring.c:6077:27: note: declared here 6077 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) | ^~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/out_free +3462 fs/io_uring.c f67676d160c6ee Jens Axboe 2019-12-02 3397 a1d7c393c4711a Jens Axboe 2020-06-22 3398 static int io_read(struct io_kiocb *req, bool force_nonblock, a1d7c393c4711a Jens Axboe 2020-06-22 3399 struct io_comp_state *cs) 2b188cc1bb857a Jens Axboe 2019-01-07 3400 { 2b188cc1bb857a Jens Axboe 2019-01-07 3401 struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; 9adbd45d6d32ff Jens Axboe 2019-12-20 3402 struct kiocb *kiocb = &req->rw.kiocb; ff6165b2d7f66f Jens Axboe 2020-08-13 3403 struct iov_iter __iter, *iter = &__iter; e8c2bc1fb6c949 Jens Axboe 2020-08-15 3404 struct io_async_rw *rw = req->async_data; 227c0c9673d867 Jens Axboe 2020-08-13 3405 ssize_t io_size, ret, ret2; f5cac8b156e8b7 Jens Axboe 2020-09-14 3406 bool no_async; ff6165b2d7f66f Jens Axboe 2020-08-13 3407 e8c2bc1fb6c949 Jens Axboe 2020-08-15 3408 if (rw) e8c2bc1fb6c949 Jens Axboe 2020-08-15 3409 iter = &rw->iter; 2b188cc1bb857a Jens Axboe 2019-01-07 3410 ff6165b2d7f66f Jens Axboe 2020-08-13 3411 ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); f67676d160c6ee Jens Axboe 2019-12-02 3412 if (ret < 0) 2b188cc1bb857a Jens Axboe 2019-01-07 3413 return ret; 758adcb5e98092 Pavel Begunkov 2020-11-07 3414 io_size = iov_iter_count(iter); fa15bafb71fd7a Pavel Begunkov 2020-08-01 3415 req->result = io_size; 227c0c9673d867 Jens Axboe 2020-08-13 3416 ret = 0; 2b188cc1bb857a Jens Axboe 2019-01-07 3417 fd6c2e4c063d64 Jens Axboe 2019-12-18 3418 /* Ensure we clear previously set non-block flag */ fd6c2e4c063d64 Jens Axboe 2019-12-18 3419 if (!force_nonblock) 29de5f6a350778 Jens Axboe 2020-02-20 3420 kiocb->ki_flags &= ~IOCB_NOWAIT; a88fc400212fc1 Pavel Begunkov 2020-09-30 3421 else a88fc400212fc1 Pavel Begunkov 2020-09-30 3422 kiocb->ki_flags |= IOCB_NOWAIT; a88fc400212fc1 Pavel Begunkov 2020-09-30 3423 24c74678634b3c Pavel Begunkov 2020-06-21 3424 /* If the file doesn't support async, just async punt */ f5cac8b156e8b7 Jens Axboe 2020-09-14 3425 no_async = force_nonblock && !io_file_supports_async(req->file, READ); f5cac8b156e8b7 Jens Axboe 2020-09-14 3426 if (no_async) f67676d160c6ee Jens Axboe 2019-12-02 3427 goto copy_iov; 9e645e1105ca60 Jens Axboe 2019-05-10 3428 758adcb5e98092 Pavel Begunkov 2020-11-07 3429 ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); 107abcc47e3a96 Pavel Begunkov 2021-02-04 3430 if (unlikely(ret)) { 107abcc47e3a96 Pavel Begunkov 2021-02-04 3431 kfree(iovec); 107abcc47e3a96 Pavel Begunkov 2021-02-04 3432 return ret; 107abcc47e3a96 Pavel Begunkov 2021-02-04 3433 } 2b188cc1bb857a Jens Axboe 2019-01-07 3434 227c0c9673d867 Jens Axboe 2020-08-13 3435 ret = io_iter_do_read(req, iter); 32960613b7c335 Jens Axboe 2019-09-23 3436 d964a45ff1644d Pavel Begunkov 2021-02-01 3437 if (ret == -EIOCBQUEUED) { 107abcc47e3a96 Pavel Begunkov 2021-02-04 3438 /* it's faster to check here then delegate to kfree */ 107abcc47e3a96 Pavel Begunkov 2021-02-04 3439 if (iovec) 107abcc47e3a96 Pavel Begunkov 2021-02-04 3440 kfree(iovec); 107abcc47e3a96 Pavel Begunkov 2021-02-04 3441 return 0; 227c0c9673d867 Jens Axboe 2020-08-13 3442 } else if (ret == -EAGAIN) { eefdf30f3dcb5c Jens Axboe 2020-08-27 3443 /* IOPOLL retry should happen for io-wq threads */ eefdf30f3dcb5c Jens Axboe 2020-08-27 3444 if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) f91daf565b0e27 Jens Axboe 2020-08-15 3445 goto done; 355afaeb578aba Jens Axboe 2020-09-02 3446 /* no retry on NONBLOCK marked file */ 355afaeb578aba Jens Axboe 2020-09-02 3447 if (req->file->f_flags & O_NONBLOCK) 355afaeb578aba Jens Axboe 2020-09-02 3448 goto done; 842163154b87b0 Jens Axboe 2020-08-24 3449 /* some cases will consume bytes even on error returns */ 758adcb5e98092 Pavel Begunkov 2020-11-07 3450 iov_iter_revert(iter, io_size - iov_iter_count(iter)); f38c7e3abfba9a Jens Axboe 2020-09-25 3451 ret = 0; 82b6fe19520be5 Pavel Begunkov 2021-02-04 3452 } else if (ret <= 0 || ret == io_size || !force_nonblock || 82b6fe19520be5 Pavel Begunkov 2021-02-04 3453 (req->file->f_flags & O_NONBLOCK) || 82b6fe19520be5 Pavel Begunkov 2021-02-04 3454 !(req->flags & REQ_F_ISREG)) { 82b6fe19520be5 Pavel Begunkov 2021-02-04 3455 /* read all, failed, already did sync or don't want to retry */ 00d23d516e2e79 Jens Axboe 2020-08-25 3456 goto done; 75a2698c924a90 Pavel Begunkov 2021-02-04 3457 } 75a2698c924a90 Pavel Begunkov 2021-02-04 3458 227c0c9673d867 Jens Axboe 2020-08-13 3459 ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); 227c0c9673d867 Jens Axboe 2020-08-13 3460 if (ret2) { 227c0c9673d867 Jens Axboe 2020-08-13 3461 ret = ret2; 227c0c9673d867 Jens Axboe 2020-08-13 @3462 goto out_free; f67676d160c6ee Jens Axboe 2019-12-02 3463 } f5cac8b156e8b7 Jens Axboe 2020-09-14 3464 if (no_async) f5cac8b156e8b7 Jens Axboe 2020-09-14 3465 return -EAGAIN; e8c2bc1fb6c949 Jens Axboe 2020-08-15 3466 rw = req->async_data; 227c0c9673d867 Jens Axboe 2020-08-13 3467 /* now use our persistent iterator, if we aren't already */ e8c2bc1fb6c949 Jens Axboe 2020-08-15 3468 iter = &rw->iter; 227c0c9673d867 Jens Axboe 2020-08-13 3469 retry: 82b6fe19520be5 Pavel Begunkov 2021-02-04 3470 io_size -= ret; e8c2bc1fb6c949 Jens Axboe 2020-08-15 3471 rw->bytes_done += ret; 227c0c9673d867 Jens Axboe 2020-08-13 3472 /* if we can retry, do so with the callbacks armed */ 227c0c9673d867 Jens Axboe 2020-08-13 3473 if (!io_rw_should_retry(req)) { bcf5a06304d69a Jens Axboe 2020-05-22 3474 kiocb->ki_flags &= ~IOCB_WAITQ; f67676d160c6ee Jens Axboe 2019-12-02 3475 return -EAGAIN; 2b188cc1bb857a Jens Axboe 2019-01-07 3476 } 227c0c9673d867 Jens Axboe 2020-08-13 3477 227c0c9673d867 Jens Axboe 2020-08-13 3478 /* 227c0c9673d867 Jens Axboe 2020-08-13 3479 * Now retry read with the IOCB_WAITQ parts set in the iocb. If we 227c0c9673d867 Jens Axboe 2020-08-13 3480 * get -EIOCBQUEUED, then we'll get a notification when the desired 227c0c9673d867 Jens Axboe 2020-08-13 3481 * page gets unlocked. We can also get a partial read here, and if we 227c0c9673d867 Jens Axboe 2020-08-13 3482 * do, then just retry at the new offset. 227c0c9673d867 Jens Axboe 2020-08-13 3483 */ 227c0c9673d867 Jens Axboe 2020-08-13 3484 ret = io_iter_do_read(req, iter); 107abcc47e3a96 Pavel Begunkov 2021-02-04 3485 if (ret == -EIOCBQUEUED) 107abcc47e3a96 Pavel Begunkov 2021-02-04 3486 return 0; 227c0c9673d867 Jens Axboe 2020-08-13 3487 /* we got some bytes, but not all. retry. */ 107abcc47e3a96 Pavel Begunkov 2021-02-04 3488 if (ret > 0 && ret < io_size) 227c0c9673d867 Jens Axboe 2020-08-13 3489 goto retry; 227c0c9673d867 Jens Axboe 2020-08-13 3490 done: 227c0c9673d867 Jens Axboe 2020-08-13 3491 kiocb_done(kiocb, ret, cs); 107abcc47e3a96 Pavel Begunkov 2021-02-04 3492 return 0; 2b188cc1bb857a Jens Axboe 2019-01-07 3493 } 2b188cc1bb857a Jens Axboe 2019-01-07 3494 :::::: The code at line 3462 was first introduced by commit :::::: 227c0c9673d86732995474d277f84e08ee763e46 io_uring: internally retry short reads :::::: TO: Jens Axboe <axboe(a)kernel.dk&gt; :::::: CC: Jens Axboe <axboe(a)kernel.dk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org