Hi, url: https://github.com/0day-ci/linux/commits/glittao-gmail-com/kunit-add-a-KUnit-test-for-SLUB-debugging-functionality/20210330-200635 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1e43c377a79f9189fea8f2711b399d4e8b4e609b config: i386-randconfig-m021-20210330 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> smatch warnings: mm/slub.c:744 object_err() warn: should this be a bitwise op? mm/slub.c:759 slab_err() warn: should this be a bitwise op? mm/slub.c:807 check_bytes_and_report() warn: should this be a bitwise op? vim +744 mm/slub.c 75c66def8d8152 Andrey Ryabinin 2015-02-13 741 void object_err(struct kmem_cache *s, struct page *page, 81819f0fc8285a Christoph Lameter 2007-05-06 742 u8 *object, char *reason) 81819f0fc8285a Christoph Lameter 2007-05-06 743 { 98f544695d3d3b Oliver Glitta 2021-03-30 @744 if (!(s->flags && SLAB_SILENT_ERRORS)) { ^^ & was intended instead of && 3dc5063786b273 Christoph Lameter 2008-04-23 745 slab_bug(s, "%s", reason); 2492268472e7d3 Christoph Lameter 2007-07-17 746 print_trailer(s, page, object); 81819f0fc8285a Christoph Lameter 2007-05-06 747 } 98f544695d3d3b Oliver Glitta 2021-03-30 748 } 81819f0fc8285a Christoph Lameter 2007-05-06 749 a38965bf941b7c Mathieu Malaterre 2018-06-07 750 static __printf(3, 4) void slab_err(struct kmem_cache *s, struct page *page, d0e0ac9772f8ec Chen Gang 2013-07-15 751 const char *fmt, ...) 81819f0fc8285a Christoph Lameter 2007-05-06 752 { 81819f0fc8285a Christoph Lameter 2007-05-06 753 va_list args; 81819f0fc8285a Christoph Lameter 2007-05-06 754 char buf[100]; 81819f0fc8285a Christoph Lameter 2007-05-06 755 2492268472e7d3 Christoph Lameter 2007-07-17 756 va_start(args, fmt); 2492268472e7d3 Christoph Lameter 2007-07-17 757 vsnprintf(buf, sizeof(buf), fmt, args); 81819f0fc8285a Christoph Lameter 2007-05-06 758 va_end(args); 98f544695d3d3b Oliver Glitta 2021-03-30 @759 if (!(s->flags && SLAB_SILENT_ERRORS)) { ^^^^^^^^^^^^^^^^^^^^^ 3dc5063786b273 Christoph Lameter 2008-04-23 760 slab_bug(s, "%s", buf); 2492268472e7d3 Christoph Lameter 2007-07-17 761 print_page_info(page); 81819f0fc8285a Christoph Lameter 2007-05-06 762 dump_stack(); 81819f0fc8285a Christoph Lameter 2007-05-06 763 } 98f544695d3d3b Oliver Glitta 2021-03-30 764 } 81819f0fc8285a Christoph Lameter 2007-05-06 765 f7cb1933621bce Christoph Lameter 2010-09-29 766 static void init_object(struct kmem_cache *s, void *object, u8 val) 81819f0fc8285a Christoph Lameter 2007-05-06 767 { aa1ef4d7b3f67f Andrey Konovalov 2020-12-22 768 u8 *p = kasan_reset_tag(object); 81819f0fc8285a Christoph Lameter 2007-05-06 769 d86bd1bece6fc4 Joonsoo Kim 2016-03-15 770 if (s->flags & SLAB_RED_ZONE) d86bd1bece6fc4 Joonsoo Kim 2016-03-15 771 memset(p - s->red_left_pad, val, s->red_left_pad); d86bd1bece6fc4 Joonsoo Kim 2016-03-15 772 81819f0fc8285a Christoph Lameter 2007-05-06 773 if (s->flags & __OBJECT_POISON) { 3b0efdfa1e7193 Christoph Lameter 2012-06-13 774 memset(p, POISON_FREE, s->object_size - 1); 3b0efdfa1e7193 Christoph Lameter 2012-06-13 775 p[s->object_size - 1] = POISON_END; 81819f0fc8285a Christoph Lameter 2007-05-06 776 } 81819f0fc8285a Christoph Lameter 2007-05-06 777 81819f0fc8285a Christoph Lameter 2007-05-06 778 if (s->flags & SLAB_RED_ZONE) 3b0efdfa1e7193 Christoph Lameter 2012-06-13 779 memset(p + s->object_size, val, s->inuse - s->object_size); 81819f0fc8285a Christoph Lameter 2007-05-06 780 } 81819f0fc8285a Christoph Lameter 2007-05-06 781 2492268472e7d3 Christoph Lameter 2007-07-17 782 static void restore_bytes(struct kmem_cache *s, char *message, u8 data, 2492268472e7d3 Christoph Lameter 2007-07-17 783 void *from, void *to) 2492268472e7d3 Christoph Lameter 2007-07-17 784 { 2492268472e7d3 Christoph Lameter 2007-07-17 785 slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data); 2492268472e7d3 Christoph Lameter 2007-07-17 786 memset(from, data, to - from); 2492268472e7d3 Christoph Lameter 2007-07-17 787 } 2492268472e7d3 Christoph Lameter 2007-07-17 788 2492268472e7d3 Christoph Lameter 2007-07-17 789 static int check_bytes_and_report(struct kmem_cache *s, struct page *page, 2492268472e7d3 Christoph Lameter 2007-07-17 790 u8 *object, char *what, 2492268472e7d3 Christoph Lameter 2007-07-17 791 u8 *start, unsigned int value, unsigned int bytes) 2492268472e7d3 Christoph Lameter 2007-07-17 792 { 2492268472e7d3 Christoph Lameter 2007-07-17 793 u8 *fault; 2492268472e7d3 Christoph Lameter 2007-07-17 794 u8 *end; e1b70dd1e6429f Miles Chen 2019-11-30 795 u8 *addr = page_address(page); 2492268472e7d3 Christoph Lameter 2007-07-17 796 a79316c6178ca4 Andrey Ryabinin 2015-02-13 797 metadata_access_enable(); aa1ef4d7b3f67f Andrey Konovalov 2020-12-22 798 fault = memchr_inv(kasan_reset_tag(start), value, bytes); a79316c6178ca4 Andrey Ryabinin 2015-02-13 799 metadata_access_disable(); 2492268472e7d3 Christoph Lameter 2007-07-17 800 if (!fault) 81819f0fc8285a Christoph Lameter 2007-05-06 801 return 1; 2492268472e7d3 Christoph Lameter 2007-07-17 802 2492268472e7d3 Christoph Lameter 2007-07-17 803 end = start + bytes; 2492268472e7d3 Christoph Lameter 2007-07-17 804 while (end > fault && end[-1] == value) 2492268472e7d3 Christoph Lameter 2007-07-17 805 end--; 2492268472e7d3 Christoph Lameter 2007-07-17 806 98f544695d3d3b Oliver Glitta 2021-03-30 @807 if (!(s->flags && SLAB_SILENT_ERRORS)) { ^^^^^^^^^^^^^^^^^^^^^ 2492268472e7d3 Christoph Lameter 2007-07-17 808 slab_bug(s, "%s overwritten", what); e1b70dd1e6429f Miles Chen 2019-11-30 809 pr_err("INFO: 0x%p-0x%p @offset=%tu. First byte 0x%x instead of 0x%x\n", e1b70dd1e6429f Miles Chen 2019-11-30 810 fault, end - 1, fault - addr, e1b70dd1e6429f Miles Chen 2019-11-30 811 fault[0], value); 2492268472e7d3 Christoph Lameter 2007-07-17 812 print_trailer(s, page, object); 98f544695d3d3b Oliver Glitta 2021-03-30 813 } 2492268472e7d3 Christoph Lameter 2007-07-17 814 2492268472e7d3 Christoph Lameter 2007-07-17 815 restore_bytes(s, what, value, fault, end); 2492268472e7d3 Christoph Lameter 2007-07-17 816 return 0; 81819f0fc8285a Christoph Lameter 2007-05-06 817 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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