Re: [PATCH] slub: kunit catch kmem_cache_alloc failed
From: kernel test robot
Date: Fri May 06 2022 - 07:46:31 EST
Hi Paran,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linus/master]
[also build test WARNING on v5.18-rc5 next-20220506]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/intel-lab-lkp/linux/commits/Paran-Lee/slub-kunit-catch-kmem_cache_alloc-failed/20220506-125540
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe27d189e3f42e31d3c8223d5daed7285e334c5e
config: hexagon-randconfig-r014-20220505 (https://download.01.org/0day-ci/archive/20220506/202205061914.zGa4ozYg-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 5e004fb787698440a387750db7f8028e7cb14cfc)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/4827e156a14ba66c648125c98967c96178ca024d
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Paran-Lee/slub-kunit-catch-kmem_cache_alloc-failed/20220506-125540
git checkout 4827e156a14ba66c648125c98967c96178ca024d
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash lib/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
>> lib/slub_kunit.c:40:16: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
unsigned long tmp;
^
1 warning generated.
vim +40 lib/slub_kunit.c
1f9f78b1b376f8 Oliver Glitta 2021-06-28 28
1f9f78b1b376f8 Oliver Glitta 2021-06-28 29 #ifndef CONFIG_KASAN
1f9f78b1b376f8 Oliver Glitta 2021-06-28 30 static void test_next_pointer(struct kunit *test)
1f9f78b1b376f8 Oliver Glitta 2021-06-28 31 {
1f9f78b1b376f8 Oliver Glitta 2021-06-28 32 struct kmem_cache *s = kmem_cache_create("TestSlub_next_ptr_free", 64, 0,
1f9f78b1b376f8 Oliver Glitta 2021-06-28 33 SLAB_POISON, NULL);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 34 u8 *p = kmem_cache_alloc(s, GFP_KERNEL);
4827e156a14ba6 Paran Lee 2022-05-06 35 if (!p) {
4827e156a14ba6 Paran Lee 2022-05-06 36 kunit_err(test, "Allocation failed: %s\n", __func__);
4827e156a14ba6 Paran Lee 2022-05-06 37 kmem_cache_destroy(s);
4827e156a14ba6 Paran Lee 2022-05-06 38 return;
4827e156a14ba6 Paran Lee 2022-05-06 39 }
1f9f78b1b376f8 Oliver Glitta 2021-06-28 @40 unsigned long tmp;
1f9f78b1b376f8 Oliver Glitta 2021-06-28 41 unsigned long *ptr_addr;
1f9f78b1b376f8 Oliver Glitta 2021-06-28 42
1f9f78b1b376f8 Oliver Glitta 2021-06-28 43 kmem_cache_free(s, p);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 44
1f9f78b1b376f8 Oliver Glitta 2021-06-28 45 ptr_addr = (unsigned long *)(p + s->offset);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 46 tmp = *ptr_addr;
1f9f78b1b376f8 Oliver Glitta 2021-06-28 47 p[s->offset] = 0x12;
1f9f78b1b376f8 Oliver Glitta 2021-06-28 48
1f9f78b1b376f8 Oliver Glitta 2021-06-28 49 /*
1f9f78b1b376f8 Oliver Glitta 2021-06-28 50 * Expecting three errors.
1f9f78b1b376f8 Oliver Glitta 2021-06-28 51 * One for the corrupted freechain and the other one for the wrong
1f9f78b1b376f8 Oliver Glitta 2021-06-28 52 * count of objects in use. The third error is fixing broken cache.
1f9f78b1b376f8 Oliver Glitta 2021-06-28 53 */
1f9f78b1b376f8 Oliver Glitta 2021-06-28 54 validate_slab_cache(s);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 55 KUNIT_EXPECT_EQ(test, 3, slab_errors);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 56
1f9f78b1b376f8 Oliver Glitta 2021-06-28 57 /*
1f9f78b1b376f8 Oliver Glitta 2021-06-28 58 * Try to repair corrupted freepointer.
1f9f78b1b376f8 Oliver Glitta 2021-06-28 59 * Still expecting two errors. The first for the wrong count
1f9f78b1b376f8 Oliver Glitta 2021-06-28 60 * of objects in use.
1f9f78b1b376f8 Oliver Glitta 2021-06-28 61 * The second error is for fixing broken cache.
1f9f78b1b376f8 Oliver Glitta 2021-06-28 62 */
1f9f78b1b376f8 Oliver Glitta 2021-06-28 63 *ptr_addr = tmp;
1f9f78b1b376f8 Oliver Glitta 2021-06-28 64 slab_errors = 0;
1f9f78b1b376f8 Oliver Glitta 2021-06-28 65
1f9f78b1b376f8 Oliver Glitta 2021-06-28 66 validate_slab_cache(s);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 67 KUNIT_EXPECT_EQ(test, 2, slab_errors);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 68
1f9f78b1b376f8 Oliver Glitta 2021-06-28 69 /*
1f9f78b1b376f8 Oliver Glitta 2021-06-28 70 * Previous validation repaired the count of objects in use.
1f9f78b1b376f8 Oliver Glitta 2021-06-28 71 * Now expecting no error.
1f9f78b1b376f8 Oliver Glitta 2021-06-28 72 */
1f9f78b1b376f8 Oliver Glitta 2021-06-28 73 slab_errors = 0;
1f9f78b1b376f8 Oliver Glitta 2021-06-28 74 validate_slab_cache(s);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 75 KUNIT_EXPECT_EQ(test, 0, slab_errors);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 76
1f9f78b1b376f8 Oliver Glitta 2021-06-28 77 kmem_cache_destroy(s);
1f9f78b1b376f8 Oliver Glitta 2021-06-28 78 }
1f9f78b1b376f8 Oliver Glitta 2021-06-28 79
--
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