tree: https://android.googlesource.com/kernel/common android-3.18 head: e1ada1f8a51f0236f1fe313d134ed401a7bc80f9 commit: acdf2e7c8becbd8453a28b3c9daaf152b6dbe33e [95/206] blktrace: Protect q->blk_trace with RCU config: i386-randconfig-s002-20200612 (attached as .config) compiler: gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010 reproduce: # apt-get install sparse # sparse version: v0.6.1-250-g42323db3-dirty git checkout acdf2e7c8becbd8453a28b3c9daaf152b6dbe33e # save the attached .config to linux build tree make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) kernel/trace/blktrace.c:315:12: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct blk_trace *bt @@ got struct blk_trace [noderef] <asn:4> *[assigned] __ret @@ kernel/trace/blktrace.c:315:12: sparse: expected struct blk_trace *bt kernel/trace/blktrace.c:315:12: sparse: got struct blk_trace [noderef] <asn:4> *[assigned] __ret kernel/trace/blktrace.c:536:18: sparse: got struct blk_trace *[assigned] bt kernel/trace/blktrace.c:536:16: sparse: got struct blk_trace [noderef] <asn:4> *[assigned] __ret kernel/trace/blktrace.c:538:24: sparse: expected struct blk_trace [noderef] <asn:4> *__ret kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1218:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1225:32: sparse: sparse: incorrect type in initializer (different base types) @@ expected unsigned long long [usertype] sector_from @@ got restricted __be64 const [usertype] sector_from @@ kernel/trace/blktrace.c:1225:32: sparse: expected unsigned long long [usertype] sector_from kernel/trace/blktrace.c:1225:32: sparse: got restricted __be64 const [usertype] sector_from kernel/trace/blktrace.c:1227:24: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __be32 [usertype] device_from @@ got unsigned int @@ kernel/trace/blktrace.c:1227:24: sparse: expected restricted __be32 [usertype] device_from kernel/trace/blktrace.c:1227:24: sparse: got unsigned int kernel/trace/blktrace.c:1228:24: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __be32 [usertype] device_to @@ got unsigned int @@ kernel/trace/blktrace.c:1228:24: sparse: expected restricted __be32 [usertype] device_to kernel/trace/blktrace.c:1228:24: sparse: got unsigned int kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1229:24: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __be64 [usertype] sector_from @@ got unsigned long long @@ kernel/trace/blktrace.c:1229:24: sparse: expected restricted __be64 [usertype] sector_from kernel/trace/blktrace.c:1229:24: sparse: got unsigned long long kernel/trace/blktrace.c:1350:33: sparse: sparse: restricted __be32 degrades to integer kernel/trace/blktrace.c:1350:55: sparse: sparse: restricted __be32 degrades to integer kernel/trace/blktrace.c:1351:34: sparse: sparse: cast from restricted __be64 kernel/trace/blktrace.c:1576:12: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct blk_trace *bt @@ got struct blk_trace [noderef] <asn:4> *[assigned] __ret @@ kernel/trace/blktrace.c:1576:12: sparse: expected struct blk_trace *bt kernel/trace/blktrace.c:1576:12: sparse: got struct blk_trace [noderef] <asn:4> *[assigned] __ret kernel/trace/blktrace.c:1614:18: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct blk_trace [noderef] <asn:4> *__ret @@ got struct blk_trace *[assigned] bt @@ kernel/trace/blktrace.c:1614:18: sparse: expected struct blk_trace [noderef] <asn:4> *__ret kernel/trace/blktrace.c:1614:18: sparse: got struct blk_trace *[assigned] bt kernel/trace/blktrace.c:1614:16: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct blk_trace *old_bt @@ got struct blk_trace [noderef] <asn:4> *[assigned] __ret @@ kernel/trace/blktrace.c:1614:16: sparse: expected struct blk_trace *old_bt kernel/trace/blktrace.c:1614:16: sparse: got struct blk_trace [noderef] <asn:4> *[assigned] __ret kernel/trace/blktrace.c:1616:23: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct blk_trace [noderef] <asn:4> *__ret @@ got struct blk_trace *old_bt @@ kernel/trace/blktrace.c:1616:23: sparse: expected struct blk_trace [noderef] <asn:4> *__ret kernel/trace/blktrace.c:1616:23: sparse: got struct blk_trace *old_bt In file included from include/linux/blkdev.h:4:0, from kernel/trace/blktrace.c:19: include/linux/sched.h:1067:42: warning: type qualifiers ignored on function return type [-Wignored-qualifiers] const struct sched_group_energy * const(*sched_domain_energy_f)(int cpu); ^ In file included from include/linux/blkdev.h:14:0, from kernel/trace/blktrace.c:19: include/linux/pagemap.h: In function 'fault_in_multipages_readable': include/linux/pagemap.h:633:16: warning: variable 'c' set but not used [-Wunused-but-set-variable] volatile char c; ^ vim +536 kernel/trace/blktrace.c 9908c30997b8a7 kernel/trace/blktrace.c Li Zefan 2009-04-14 444 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 445 /* 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 446 * Setup everything required to start tracing 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 447 */ 6da127ad0918f9 block/blktrace.c Christof Schmitt 2008-01-11 448 int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, d0deef5b14af7d kernel/trace/blktrace.c Shawn Du 2009-04-14 449 struct block_device *bdev, 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 450 struct blk_user_trace_setup *buts) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 451 { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 452 struct blk_trace *old_bt, *bt = NULL; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 453 struct dentry *dir = NULL; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 454 int ret, i; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 455 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 456 if (!buts->buf_size || !buts->buf_nr) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 457 return -EINVAL; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 458 0497b345e7d067 block/blktrace.c Jens Axboe 2008-10-01 459 strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); 0497b345e7d067 block/blktrace.c Jens Axboe 2008-10-01 460 buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 461 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 462 /* 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 463 * some device names have larger paths - convert the slashes 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 464 * to underscores for this to work as expected 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 465 */ 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 466 for (i = 0; i < strlen(buts->name); i++) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 467 if (buts->name[i] == '/') 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 468 buts->name[i] = '_'; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 469 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 470 bt = kzalloc(sizeof(*bt), GFP_KERNEL); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 471 if (!bt) ad5dd5493a55e4 kernel/trace/blktrace.c Li Zefan 2009-03-27 472 return -ENOMEM; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 473 ad5dd5493a55e4 kernel/trace/blktrace.c Li Zefan 2009-03-27 474 ret = -ENOMEM; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 475 bt->sequence = alloc_percpu(unsigned long); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 476 if (!bt->sequence) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 477 goto err; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 478 313e458f81ec38 block/blktrace.c Rusty Russell 2009-02-20 479 bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char)); 64565911cdb57c block/blktrace.c Jens Axboe 2008-05-28 480 if (!bt->msg_data) 64565911cdb57c block/blktrace.c Jens Axboe 2008-05-28 481 goto err; 64565911cdb57c block/blktrace.c Jens Axboe 2008-05-28 482 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 483 ret = -ENOENT; f48fc4d32e24c0 block/blktrace.c Jens Axboe 2009-01-05 484 b5230b56ee6cae kernel/trace/blktrace.c Li Zefan 2009-03-25 485 mutex_lock(&blk_tree_mutex); f48fc4d32e24c0 block/blktrace.c Jens Axboe 2009-01-05 486 if (!blk_tree_root) { f48fc4d32e24c0 block/blktrace.c Jens Axboe 2009-01-05 487 blk_tree_root = debugfs_create_dir("block", NULL); b5230b56ee6cae kernel/trace/blktrace.c Li Zefan 2009-03-25 488 if (!blk_tree_root) { b5230b56ee6cae kernel/trace/blktrace.c Li Zefan 2009-03-25 489 mutex_unlock(&blk_tree_mutex); 1a17662ea03367 kernel/trace/blktrace.c Li Zefan 2009-03-20 490 goto err; f48fc4d32e24c0 block/blktrace.c Jens Axboe 2009-01-05 491 } b5230b56ee6cae kernel/trace/blktrace.c Li Zefan 2009-03-25 492 } b5230b56ee6cae kernel/trace/blktrace.c Li Zefan 2009-03-25 493 mutex_unlock(&blk_tree_mutex); f48fc4d32e24c0 block/blktrace.c Jens Axboe 2009-01-05 494 f48fc4d32e24c0 block/blktrace.c Jens Axboe 2009-01-05 495 dir = debugfs_create_dir(buts->name, blk_tree_root); f48fc4d32e24c0 block/blktrace.c Jens Axboe 2009-01-05 496 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 497 if (!dir) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 498 goto err; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 499 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 500 bt->dir = dir; 6da127ad0918f9 block/blktrace.c Christof Schmitt 2008-01-11 501 bt->dev = dev; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 502 atomic_set(&bt->dropped, 0); a404d5576bbe58 kernel/trace/blktrace.c Jan Kara 2013-09-17 503 INIT_LIST_HEAD(&bt->running_list); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 504 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 505 ret = -EIO; 939b366977d29b block/blktrace.c Arnaldo Carvalho de Melo 2009-02-03 506 bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, 939b366977d29b block/blktrace.c Arnaldo Carvalho de Melo 2009-02-03 507 &blk_dropped_fops); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 508 if (!bt->dropped_file) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 509 goto err; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 510 02c62304e6af60 block/blktrace.c Alan D. Brunelle 2008-06-11 511 bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); 02c62304e6af60 block/blktrace.c Alan D. Brunelle 2008-06-11 512 if (!bt->msg_file) 02c62304e6af60 block/blktrace.c Alan D. Brunelle 2008-06-11 513 goto err; 02c62304e6af60 block/blktrace.c Alan D. Brunelle 2008-06-11 514 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 515 bt->rchan = relay_open("trace", dir, buts->buf_size, 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 516 buts->buf_nr, &blk_relay_callbacks, bt); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 517 if (!bt->rchan) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 518 goto err; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 519 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 520 bt->act_mask = buts->act_mask; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 521 if (!bt->act_mask) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 522 bt->act_mask = (u16) -1; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 523 9908c30997b8a7 kernel/trace/blktrace.c Li Zefan 2009-04-14 524 blk_trace_setup_lba(bt, bdev); d0deef5b14af7d kernel/trace/blktrace.c Shawn Du 2009-04-14 525 d0deef5b14af7d kernel/trace/blktrace.c Shawn Du 2009-04-14 526 /* overwrite with user settings */ d0deef5b14af7d kernel/trace/blktrace.c Shawn Du 2009-04-14 527 if (buts->start_lba) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 528 bt->start_lba = buts->start_lba; d0deef5b14af7d kernel/trace/blktrace.c Shawn Du 2009-04-14 529 if (buts->end_lba) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 530 bt->end_lba = buts->end_lba; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 531 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 532 bt->pid = buts->pid; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 533 bt->trace_state = Blktrace_setup; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 534 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 535 ret = -EBUSY; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 @536 old_bt = xchg(&q->blk_trace, bt); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 537 if (old_bt) { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 @538 (void) xchg(&q->blk_trace, old_bt); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 539 goto err; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 540 } 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 541 17ba97e347bec9 kernel/trace/blktrace.c Li Zefan 2009-03-27 542 if (atomic_inc_return(&blk_probes_ref) == 1) cbe28296eb1ac4 kernel/trace/blktrace.c Li Zefan 2009-03-20 543 blk_register_tracepoints(); cbe28296eb1ac4 kernel/trace/blktrace.c Li Zefan 2009-03-20 544 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 545 return 0; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 546 err: ad5dd5493a55e4 kernel/trace/blktrace.c Li Zefan 2009-03-27 547 blk_trace_free(bt); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 548 return ret; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 549 } 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 550 :::::: The code at line 536 was first introduced by commit :::::: 2056a782f8e7e65fd4bfd027506b4ce1c5e9ccd4 [PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23 :::::: TO: Jens Axboe <axboe(a)suse.de&gt; :::::: CC: Jens Axboe <axboe(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org