tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git 20200605-blktrace-fixes-v4 head: 5198fc554bd362e6b4800af7fddd577e0558ed50 commit: 5198fc554bd362e6b4800af7fddd577e0558ed50 [8/8] blktrace: fix debugfs use after free config: i386-randconfig-s002-20200608 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-247-gcadbd124-dirty git checkout 5198fc554bd362e6b4800af7fddd577e0558ed50 # 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; All errors (new ones prefixed by >>, old ones prefixed by <<): 1540 | [__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error }, | ^~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1540:48: note: (near initialization for 'what2act[6].print') kernel/trace/blktrace.c:1541:44: error: initializer element is not constant 1541 | [__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic }, | ^~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1541:44: note: (near initialization for 'what2act[7].print') kernel/trace/blktrace.c:1542:49: error: initializer element is not constant 1542 | [__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error }, | ^~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1542:49: note: (near initialization for 'what2act[8].print') kernel/trace/blktrace.c:1543:43: error: initializer element is not constant 1543 | [__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug }, | ^~~~~~~~~~~~ kernel/trace/blktrace.c:1543:43: note: (near initialization for 'what2act[9].print') kernel/trace/blktrace.c:1544:50: error: initializer element is not constant 1544 | [__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug }, | ^~~~~~~~~~~~~~ kernel/trace/blktrace.c:1544:50: note: (near initialization for 'what2act[10].print') kernel/trace/blktrace.c:1545:55: error: initializer element is not constant 1545 | [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug }, | ^~~~~~~~~~~~~~ kernel/trace/blktrace.c:1545:55: note: (near initialization for 'what2act[11].print') kernel/trace/blktrace.c:1546:46: error: initializer element is not constant 1546 | [__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic }, | ^~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1546:46: note: (near initialization for 'what2act[12].print') kernel/trace/blktrace.c:1547:44: error: initializer element is not constant 1547 | [__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split }, | ^~~~~~~~~~~~~ kernel/trace/blktrace.c:1547:44: note: (near initialization for 'what2act[13].print') kernel/trace/blktrace.c:1548:46: error: initializer element is not constant 1548 | [__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic }, | ^~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1548:46: note: (near initialization for 'what2act[14].print') kernel/trace/blktrace.c:1549:44: error: initializer element is not constant 1549 | [__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap }, | ^~~~~~~~~~~~~ kernel/trace/blktrace.c:1549:44: note: (near initialization for 'what2act[15].print') kernel/trace/blktrace.c:1552:26: error: invalid storage class for function 'print_one_line' 1552 | static enum print_line_t print_one_line(struct trace_iterator *iter, | ^~~~~~~~~~~~~~ kernel/trace/blktrace.c:1585:26: error: invalid storage class for function 'blk_trace_event_print' 1585 | static enum print_line_t blk_trace_event_print(struct trace_iterator *iter, | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1591:13: error: invalid storage class for function 'blk_trace_synthesize_old_trace' 1591 | static void blk_trace_synthesize_old_trace(struct trace_iterator *iter) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1607:1: error: invalid storage class for function 'blk_trace_event_print_binary' 1607 | blk_trace_event_print_binary(struct trace_iterator *iter, int flags, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1615:26: error: invalid storage class for function 'blk_tracer_print_line' 1615 | static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1624:1: error: invalid storage class for function 'blk_tracer_set_flag' 1624 | blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | ^~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1638:11: error: initializer element is not constant 1638 | .init = blk_tracer_init, | ^~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1638:11: note: (near initialization for 'blk_tracer.init') kernel/trace/blktrace.c:1639:12: error: initializer element is not constant 1639 | .reset = blk_tracer_reset, | ^~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1639:12: note: (near initialization for 'blk_tracer.reset') kernel/trace/blktrace.c:1640:12: error: initializer element is not constant 1640 | .start = blk_tracer_start, | ^~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1640:12: note: (near initialization for 'blk_tracer.start') kernel/trace/blktrace.c:1641:11: error: initializer element is not constant 1641 | .stop = blk_tracer_stop, | ^~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1641:11: note: (near initialization for 'blk_tracer.stop') kernel/trace/blktrace.c:1642:18: error: initializer element is not constant 1642 | .print_header = blk_tracer_print_header, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1642:18: note: (near initialization for 'blk_tracer.print_header') kernel/trace/blktrace.c:1643:16: error: initializer element is not constant 1643 | .print_line = blk_tracer_print_line, | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1643:16: note: (near initialization for 'blk_tracer.print_line') kernel/trace/blktrace.c:1645:14: error: initializer element is not constant 1645 | .set_flag = blk_tracer_set_flag, | ^~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1645:14: note: (near initialization for 'blk_tracer.set_flag') kernel/trace/blktrace.c:1649:12: error: initializer element is not constant 1649 | .trace = blk_trace_event_print, | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1649:12: note: (near initialization for 'trace_blk_event_funcs.trace') kernel/trace/blktrace.c:1650:13: error: initializer element is not constant 1650 | .binary = blk_trace_event_print_binary, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1650:13: note: (near initialization for 'trace_blk_event_funcs.binary') kernel/trace/blktrace.c:1658:19: error: invalid storage class for function 'init_blk_tracer' 1658 | static int __init init_blk_tracer(void) | ^~~~~~~~~~~~~~~ In file included from include/linux/export.h:43, from include/linux/linkage.h:7, from include/linux/kernel.h:8, from kernel/trace/blktrace.c:9: 302 | __PASTE(__addressable_##sym, __LINE__) = (void *)&sym; | ^ include/linux/init.h:189:2: note: in expansion of macro '__ADDRESSABLE' 189 | __ADDRESSABLE(fn) | ^~~~~~~~~~~~~ include/linux/init.h:200:35: note: in expansion of macro '___define_initcall' 200 | #define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id) | ^~~~~~~~~~~~~~~~~~ include/linux/init.h:229:30: note: in expansion of macro '__define_initcall' 229 | #define device_initcall(fn) __define_initcall(fn, 6) | ^~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1674:1: note: in expansion of macro 'device_initcall' 1674 | device_initcall(init_blk_tracer); | ^~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1676:12: error: invalid storage class for function 'blk_trace_remove_queue' 1676 | static int blk_trace_remove_queue(struct request_queue *q) | ^~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1676:1: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement] 1676 | static int blk_trace_remove_queue(struct request_queue *q) | ^~~~~~ kernel/trace/blktrace.c:1694:12: error: invalid storage class for function 'blk_trace_setup_queue' 1694 | static int blk_trace_setup_queue(struct request_queue *q, | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1726:16: error: invalid storage class for function 'sysfs_blk_trace_attr_show' 1726 | static ssize_t sysfs_blk_trace_attr_show(struct device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1729:16: error: invalid storage class for function 'sysfs_blk_trace_attr_store' 1729 | static ssize_t sysfs_blk_trace_attr_store(struct device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kobject.h:20, from include/linux/device.h:17, from include/linux/genhd.h:36, from include/linux/blkdev.h:11, from kernel/trace/blktrace.c:10: kernel/trace/blktrace.c:1734:7: error: 'sysfs_blk_trace_attr_show' undeclared (first use in this function) 1734 | sysfs_blk_trace_attr_show, | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/sysfs.h:104:10: note: in definition of macro '__ATTR' 104 | .show = _show, | ^~~~~ kernel/trace/blktrace.c:1733:2: note: in expansion of macro 'DEVICE_ATTR' 1733 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, | ^~~~~~~~~~~ kernel/trace/blktrace.c:1737:8: note: in expansion of macro 'BLK_TRACE_DEVICE_ATTR' 1737 | static BLK_TRACE_DEVICE_ATTR(enable); | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1734:7: note: each undeclared identifier is reported only once for each function it appears in 1734 | sysfs_blk_trace_attr_show, | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/sysfs.h:104:10: note: in definition of macro '__ATTR' 104 | .show = _show, | ^~~~~ kernel/trace/blktrace.c:1733:2: note: in expansion of macro 'DEVICE_ATTR' 1733 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, | ^~~~~~~~~~~ kernel/trace/blktrace.c:1737:8: note: in expansion of macro 'BLK_TRACE_DEVICE_ATTR' 1737 | static BLK_TRACE_DEVICE_ATTR(enable); | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1734:7: error: initialization of 'ssize_t (*)(struct device *, struct device_attribute *, char *)' {aka 'int (*)(struct device *, struct device_attribute *, char *)'} from incompatible pointer type 'const struct <anonymous> *' [-Werror=incompatible-pointer-types] 1734 | sysfs_blk_trace_attr_show, | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/sysfs.h:104:10: note: in definition of macro '__ATTR' 104 | .show = _show, | ^~~~~ kernel/trace/blktrace.c:1733:2: note: in expansion of macro 'DEVICE_ATTR' 1733 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, | ^~~~~~~~~~~ kernel/trace/blktrace.c:1737:8: note: in expansion of macro 'BLK_TRACE_DEVICE_ATTR' 1737 | static BLK_TRACE_DEVICE_ATTR(enable); | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1734:7: note: (near initialization for 'dev_attr_enable.show') 1734 | sysfs_blk_trace_attr_show, | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/sysfs.h:104:10: note: in definition of macro '__ATTR' 104 | .show = _show, | ^~~~~ kernel/trace/blktrace.c:1733:2: note: in expansion of macro 'DEVICE_ATTR' 1733 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, | ^~~~~~~~~~~ kernel/trace/blktrace.c:1737:8: note: in expansion of macro 'BLK_TRACE_DEVICE_ATTR' 1737 | static BLK_TRACE_DEVICE_ATTR(enable); | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1734:7: error: initializer element is not constant 1734 | sysfs_blk_trace_attr_show, | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/sysfs.h:104:10: note: in definition of macro '__ATTR' 104 | .show = _show, | ^~~~~ kernel/trace/blktrace.c:1733:2: note: in expansion of macro 'DEVICE_ATTR' 1733 | DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, | ^~~~~~~~~~~ kernel/trace/blktrace.c:1737:8: note: in expansion of macro 'BLK_TRACE_DEVICE_ATTR' 1737 | static BLK_TRACE_DEVICE_ATTR(enable); | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1734:7: note: (near initialization for 'dev_attr_enable.show') 1734 | sysfs_blk_trace_attr_show, | ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/sysfs.h:104:10: note: in definition of macro '__ATTR' 104 | .show = _show, | ^~~~~ vim +302 include/linux/compiler.h ^1da177e4c3f41 Linus Torvalds 2005-04-16 293 7290d58095712a Ard Biesheuvel 2018-08-21 294 /* 7290d58095712a Ard Biesheuvel 2018-08-21 295 * Force the compiler to emit 'sym' as a symbol, so that we can reference 7290d58095712a Ard Biesheuvel 2018-08-21 296 * it from inline assembler. Necessary in case 'sym' could be inlined 7290d58095712a Ard Biesheuvel 2018-08-21 297 * otherwise, or eliminated entirely due to lack of references that are 7290d58095712a Ard Biesheuvel 2018-08-21 298 * visible to the compiler. 7290d58095712a Ard Biesheuvel 2018-08-21 299 */ 7290d58095712a Ard Biesheuvel 2018-08-21 300 #define __ADDRESSABLE(sym) \ bfafddd8de426d Nick Desaulniers 2019-08-28 301 static void * __section(.discard.addressable) __used \ 7290d58095712a Ard Biesheuvel 2018-08-21 @302 __PASTE(__addressable_##sym, __LINE__) = (void *)&sym; 7290d58095712a Ard Biesheuvel 2018-08-21 303 :::::: The code at line 302 was first introduced by commit :::::: 7290d58095712a89f845e1bca05334796dd49ed2 module: use relative references for __ksymtab entries :::::: TO: Ard Biesheuvel <ard.biesheuvel(a)linaro.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org