Hi Szymon, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on fuse/for-next] [also build test WARNING on v4.14-rc8 next-20171109] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Szymon-Lukasz/fuse-return-ECONNABORTED-on-dev-fuse-read-after-abort/20171110-013308 base: https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__ sparse warnings: (new ones prefixed by >>) vim +409 fs/fuse/cuse.c 151060ac1 Tejun Heo 2009-04-14 299 151060ac1 Tejun Heo 2009-04-14 300 /** 151060ac1 Tejun Heo 2009-04-14 301 * cuse_process_init_reply - finish initializing CUSE channel 151060ac1 Tejun Heo 2009-04-14 302 * 151060ac1 Tejun Heo 2009-04-14 303 * This function creates the character device and sets up all the 151060ac1 Tejun Heo 2009-04-14 304 * required data structures for it. Please read the comment at the 151060ac1 Tejun Heo 2009-04-14 305 * top of this file for high level overview. 151060ac1 Tejun Heo 2009-04-14 306 */ 151060ac1 Tejun Heo 2009-04-14 307 static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 151060ac1 Tejun Heo 2009-04-14 308 { 30783587b David Herrmann 2012-11-17 309 struct cuse_conn *cc = fc_to_cc(fc), *pos; 07d5f69b4 Miklos Szeredi 2011-03-21 310 struct cuse_init_out *arg = req->out.args[0].value; 151060ac1 Tejun Heo 2009-04-14 311 struct page *page = req->pages[0]; 151060ac1 Tejun Heo 2009-04-14 312 struct cuse_devinfo devinfo = { }; 151060ac1 Tejun Heo 2009-04-14 313 struct device *dev; 151060ac1 Tejun Heo 2009-04-14 314 struct cdev *cdev; 151060ac1 Tejun Heo 2009-04-14 315 dev_t devt; 30783587b David Herrmann 2012-11-17 316 int rc, i; 151060ac1 Tejun Heo 2009-04-14 317 151060ac1 Tejun Heo 2009-04-14 318 if (req->out.h.error || 151060ac1 Tejun Heo 2009-04-14 319 arg->major != FUSE_KERNEL_VERSION || arg->minor < 11) { 151060ac1 Tejun Heo 2009-04-14 320 goto err; 151060ac1 Tejun Heo 2009-04-14 321 } 151060ac1 Tejun Heo 2009-04-14 322 151060ac1 Tejun Heo 2009-04-14 323 fc->minor = arg->minor; 151060ac1 Tejun Heo 2009-04-14 324 fc->max_read = max_t(unsigned, arg->max_read, 4096); 151060ac1 Tejun Heo 2009-04-14 325 fc->max_write = max_t(unsigned, arg->max_write, 4096); 151060ac1 Tejun Heo 2009-04-14 326 151060ac1 Tejun Heo 2009-04-14 327 /* parse init reply */ 151060ac1 Tejun Heo 2009-04-14 328 cc->unrestricted_ioctl = arg->flags & CUSE_UNRESTRICTED_IOCTL; 151060ac1 Tejun Heo 2009-04-14 329 151060ac1 Tejun Heo 2009-04-14 330 rc = cuse_parse_devinfo(page_address(page), req->out.args[1].size, 151060ac1 Tejun Heo 2009-04-14 331 &devinfo); 151060ac1 Tejun Heo 2009-04-14 332 if (rc) 151060ac1 Tejun Heo 2009-04-14 333 goto err; 151060ac1 Tejun Heo 2009-04-14 334 151060ac1 Tejun Heo 2009-04-14 335 /* determine and reserve devt */ 151060ac1 Tejun Heo 2009-04-14 336 devt = MKDEV(arg->dev_major, arg->dev_minor); 151060ac1 Tejun Heo 2009-04-14 337 if (!MAJOR(devt)) 151060ac1 Tejun Heo 2009-04-14 338 rc = alloc_chrdev_region(&devt, MINOR(devt), 1, devinfo.name); 151060ac1 Tejun Heo 2009-04-14 339 else 151060ac1 Tejun Heo 2009-04-14 340 rc = register_chrdev_region(devt, 1, devinfo.name); 151060ac1 Tejun Heo 2009-04-14 341 if (rc) { 151060ac1 Tejun Heo 2009-04-14 342 printk(KERN_ERR "CUSE: failed to register chrdev region\n"); 151060ac1 Tejun Heo 2009-04-14 343 goto err; 151060ac1 Tejun Heo 2009-04-14 344 } 151060ac1 Tejun Heo 2009-04-14 345 151060ac1 Tejun Heo 2009-04-14 346 /* devt determined, create device */ 151060ac1 Tejun Heo 2009-04-14 347 rc = -ENOMEM; 151060ac1 Tejun Heo 2009-04-14 348 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 151060ac1 Tejun Heo 2009-04-14 349 if (!dev) 151060ac1 Tejun Heo 2009-04-14 350 goto err_region; 151060ac1 Tejun Heo 2009-04-14 351 151060ac1 Tejun Heo 2009-04-14 352 device_initialize(dev); 151060ac1 Tejun Heo 2009-04-14 353 dev_set_uevent_suppress(dev, 1); 151060ac1 Tejun Heo 2009-04-14 354 dev->class = cuse_class; 151060ac1 Tejun Heo 2009-04-14 355 dev->devt = devt; 151060ac1 Tejun Heo 2009-04-14 356 dev->release = cuse_gendev_release; 151060ac1 Tejun Heo 2009-04-14 357 dev_set_drvdata(dev, cc); 151060ac1 Tejun Heo 2009-04-14 358 dev_set_name(dev, "%s", devinfo.name); 151060ac1 Tejun Heo 2009-04-14 359 30783587b David Herrmann 2012-11-17 360 mutex_lock(&cuse_lock); 30783587b David Herrmann 2012-11-17 361 30783587b David Herrmann 2012-11-17 362 /* make sure the device-name is unique */ 30783587b David Herrmann 2012-11-17 363 for (i = 0; i < CUSE_CONNTBL_LEN; ++i) { 30783587b David Herrmann 2012-11-17 364 list_for_each_entry(pos, &cuse_conntbl[i], list) 30783587b David Herrmann 2012-11-17 365 if (!strcmp(dev_name(pos->dev), dev_name(dev))) 30783587b David Herrmann 2012-11-17 366 goto err_unlock; 30783587b David Herrmann 2012-11-17 367 } 30783587b David Herrmann 2012-11-17 368 151060ac1 Tejun Heo 2009-04-14 369 rc = device_add(dev); 151060ac1 Tejun Heo 2009-04-14 370 if (rc) 30783587b David Herrmann 2012-11-17 371 goto err_unlock; 151060ac1 Tejun Heo 2009-04-14 372 151060ac1 Tejun Heo 2009-04-14 373 /* register cdev */ 151060ac1 Tejun Heo 2009-04-14 374 rc = -ENOMEM; 151060ac1 Tejun Heo 2009-04-14 375 cdev = cdev_alloc(); 151060ac1 Tejun Heo 2009-04-14 376 if (!cdev) 30783587b David Herrmann 2012-11-17 377 goto err_unlock; 151060ac1 Tejun Heo 2009-04-14 378 151060ac1 Tejun Heo 2009-04-14 379 cdev->owner = THIS_MODULE; 151060ac1 Tejun Heo 2009-04-14 380 cdev->ops = &cuse_frontend_fops; 151060ac1 Tejun Heo 2009-04-14 381 151060ac1 Tejun Heo 2009-04-14 382 rc = cdev_add(cdev, devt, 1); 151060ac1 Tejun Heo 2009-04-14 383 if (rc) 151060ac1 Tejun Heo 2009-04-14 384 goto err_cdev; 151060ac1 Tejun Heo 2009-04-14 385 151060ac1 Tejun Heo 2009-04-14 386 cc->dev = dev; 151060ac1 Tejun Heo 2009-04-14 387 cc->cdev = cdev; 151060ac1 Tejun Heo 2009-04-14 388 151060ac1 Tejun Heo 2009-04-14 389 /* make the device available */ 151060ac1 Tejun Heo 2009-04-14 390 list_add(&cc->list, cuse_conntbl_head(devt)); 8ce03fd76 David Herrmann 2012-11-17 391 mutex_unlock(&cuse_lock); 151060ac1 Tejun Heo 2009-04-14 392 151060ac1 Tejun Heo 2009-04-14 393 /* announce device availability */ 151060ac1 Tejun Heo 2009-04-14 394 dev_set_uevent_suppress(dev, 0); 151060ac1 Tejun Heo 2009-04-14 395 kobject_uevent(&dev->kobj, KOBJ_ADD); 151060ac1 Tejun Heo 2009-04-14 396 out: 07d5f69b4 Miklos Szeredi 2011-03-21 397 kfree(arg); 151060ac1 Tejun Heo 2009-04-14 398 __free_page(page); 151060ac1 Tejun Heo 2009-04-14 399 return; 151060ac1 Tejun Heo 2009-04-14 400 151060ac1 Tejun Heo 2009-04-14 401 err_cdev: 151060ac1 Tejun Heo 2009-04-14 402 cdev_del(cdev); 30783587b David Herrmann 2012-11-17 403 err_unlock: 30783587b David Herrmann 2012-11-17 404 mutex_unlock(&cuse_lock); 151060ac1 Tejun Heo 2009-04-14 405 put_device(dev); 151060ac1 Tejun Heo 2009-04-14 406 err_region: 151060ac1 Tejun Heo 2009-04-14 407 unregister_chrdev_region(devt, 1); 151060ac1 Tejun Heo 2009-04-14 408 err: 580640ba5 Miklos Szeredi 2014-12-12 @409 fuse_abort_conn(fc); 151060ac1 Tejun Heo 2009-04-14 410 goto out; 151060ac1 Tejun Heo 2009-04-14 411 } 151060ac1 Tejun Heo 2009-04-14 412 :::::: The code at line 409 was first introduced by commit :::::: 580640ba5d331eb5631a5de46941c98f5ed90886 fuse: flush requests on umount :::::: TO: Miklos Szeredi <mszeredi@xxxxxxx> :::::: CC: Miklos Szeredi <mszeredi@xxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
