tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y head: 4f68020fef1c6cf1b680ffb6481ac41379283ea3 commit: 7a35c8cbf2522e4f45d266dca95dacc71cf412ed [9865/9999] blktrace: Protect q->blk_trace with RCU config: arc-randconfig-s031-20201111 (attached as .config) compiler: arceb-elf-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-107-gaf3512a6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.14.y git checkout 7a35c8cbf2522e4f45d266dca95dacc71cf412ed # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arc 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:360:12: sparse: expected struct blk_trace *bt kernel/trace/blktrace.c:1025:50: sparse: sparse: incorrect type in argument 7 (different base types) @@ expected int error @@ got restricted blk_status_t [usertype] bi_status @@ kernel/trace/blktrace.c:1025:50: sparse: expected int error kernel/trace/blktrace.c:1025:50: sparse: got restricted blk_status_t [usertype] bi_status kernel/trace/blktrace.c:1063:68: sparse: sparse: incorrect type in argument 7 (different base types) @@ expected int error @@ got restricted blk_status_t [usertype] bi_status @@ kernel/trace/blktrace.c:1063:68: sparse: expected int error kernel/trace/blktrace.c:1063:68: sparse: got restricted blk_status_t [usertype] bi_status kernel/trace/blktrace.c:1286:16: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1293:32: 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:1293:32: sparse: expected unsigned long long [usertype] sector_from kernel/trace/blktrace.c:1293:32: sparse: got restricted __be64 const [usertype] sector_from kernel/trace/blktrace.c:1295:24: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __be32 [usertype] device_from @@ got unsigned int [usertype] @@ kernel/trace/blktrace.c:1295:24: sparse: expected restricted __be32 [usertype] device_from kernel/trace/blktrace.c:1295:24: sparse: got unsigned int [usertype] kernel/trace/blktrace.c:1296:24: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __be32 [usertype] device_to @@ got unsigned int [usertype] @@ kernel/trace/blktrace.c:1296:24: sparse: expected restricted __be32 [usertype] device_to kernel/trace/blktrace.c:1296:24: sparse: got unsigned int [usertype] kernel/trace/blktrace.c:1297:26: sparse: sparse: cast to restricted __be64 kernel/trace/blktrace.c:1297:24: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __be64 [usertype] sector_from @@ got unsigned long long [usertype] @@ kernel/trace/blktrace.c:1297:24: sparse: expected restricted __be64 [usertype] sector_from kernel/trace/blktrace.c:1297:24: sparse: got unsigned long long [usertype] kernel/trace/blktrace.c:1430:26: sparse: sparse: restricted __be32 degrades to integer kernel/trace/blktrace.c:1430:48: sparse: sparse: restricted __be32 degrades to integer kernel/trace/blktrace.c:1431:27: sparse: sparse: cast from restricted __be64 kernel/trace/blktrace.c:1655:12: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct blk_trace *bt @@ got struct blk_trace [noderef] <asn:4> *[assigned] old_val @@ kernel/trace/blktrace.c:1655:12: sparse: expected struct blk_trace *bt kernel/trace/blktrace.c:1655:12: sparse: got struct blk_trace [noderef] <asn:4> *[assigned] old_val In file included from include/linux/workqueue.h:9, from include/linux/rhashtable.h:26, from include/linux/ipc.h:7, from include/uapi/linux/sem.h:5, from include/linux/sem.h:9, from include/linux/sched.h:15, from include/linux/blkdev.h:5, from kernel/trace/blktrace.c:19: include/linux/timer.h: In function 'timer_setup': include/linux/timer.h:179:23: warning: cast between incompatible function types from 'void (*)(struct timer_list *)' to 'void (*)(long unsigned int)' [-Wcast-function-type] 179 | __setup_timer(timer, (TIMER_FUNC_TYPE)callback, | ^ include/linux/timer.h:144:25: note: in definition of macro '__setup_timer' 144 | (_timer)->function = (_fn); 44- | ^~~ kernel/trace/blktrace.c: In function '__trace_note_message': kernel/trace/blktrace.c:158:63: warning: parameter 'blkcg' set but not used [-Wunused-but-set-parameter] 158 | void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg, | ~~~~~~~~~~~~~~^~~~~ kernel/trace/blktrace.c: In function 'blk_trace_ioctl': kernel/trace/blktrace.c:740:9: warning: this statement may fall through [-Wimplicit-fallthrough=] 740 | start = 1; | ~~~~~~^~~ kernel/trace/blktrace.c:741:2: note: here 741 | case BLKTRACESTOP: | ^~~~ vim +360 kernel/trace/blktrace.c 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 355 b390c22c0bc7582 kernel/trace/blktrace.c Jens Axboe 2017-11-05 356 static int __blk_trace_remove(struct request_queue *q) 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 357 { 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 358 struct blk_trace *bt; 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 359 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 @360 bt = xchg(&q->blk_trace, NULL); 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 361 if (!bt) 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 362 return -EINVAL; 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 363 5554720482a6317 kernel/trace/blktrace.c Li Zefan 2009-03-25 364 if (bt->trace_state != Blktrace_running) 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 365 blk_trace_cleanup(bt); 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 366 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 367 return 0; 2056a782f8e7e65 block/blktrace.c Jens Axboe 2006-03-23 368 } b390c22c0bc7582 kernel/trace/blktrace.c Jens Axboe 2017-11-05 369 :::::: The code at line 360 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