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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: hi, Vlastimil Babka and Jann Horn, On Mon, Aug 26, 2024 at 10:27:29PM +0200, Vlastimil Babka wrote: > On 8/26/24 22:18, Jann Horn wrote: > > Hi! > > > > On Sun, Aug 25, 2024 at 11:45 AM kernel test robot > > wrote: > >> Hello, > >> > >> kernel test robot noticed "BUG:KASAN:slab-use-after-free_in_kmem_cache_rcu_uaf" on: > >> > >> commit: 3a34e8ea62cdeba64a66fa4489059c59ba4ec285 ("slub: Introduce CONFIG_SLUB_RCU_DEBUG") > >> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master > >> > >> [test failed on linux-next/master c79c85875f1af04040fe4492ed94ce37ad729c4d] > >> > >> in testcase: kunit > >> version: > >> with following parameters: > >> > >> group: group-00 > >> > >> > >> > >> compiler: gcc-12 > >> test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz (Cascade Lake) with 128G memory > >> > >> (please refer to attached dmesg/kmsg for entire log/backtrace) > >> > >> > >> > >> If you fix the issue in a separate patch/commit (i.e. not just a new version of > >> the same patch/commit), kindly add following tags > >> | Reported-by: kernel test robot > >> | Closes: https://lore.kernel.org/oe-lkp/202408251741.4ce3b34e-oliver.sang@intel.com > >> > >> > >> The kernel config and materials to reproduce are available at: > >> https://download.01.org/0day-ci/archive/20240825/202408251741.4ce3b34e-oliver.sang@intel.com > > > > Oh, this is a weird one... > > As I replied I think lkp simply reacts to the BUG: in dmesg and doesn't > filter it out as an expected test output. got it. we will follow to filter out expected test output. > > > Do you happen to have either the vmlinux ELF file that this issue > > happened with, or a version of the bug report that's been run through > > scripts/decode_stacktrace.sh, so that we can tell whether the reported > > slab-use-after-free is on line 1029 (which would mean that either ASAN > > is not tracking the state of the object correctly or the object is > > The reported freed stack suggests the object was already freed by rcu, so we > should be past the rcu_read_unlock(); > > > freed earlier than it should) or line 1039 (which would mean the > > KUNIT_EXPECT_KASAN_FAIL() is not working at it should)? > > There's also "ok 38 kmem_cache_rcu_uaf" in the log so the kunit test macro > is satisfied. thanks a lot for information!