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yJckcuv5oIUIUQXkhBrQxo8RhIVgtUHbOzoPLIgSBAXFiZL9UtDwHM9SVEYcfSxVmen8SOoMaLCWCEZY= 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, On Mon, Oct 13, 2025 at 04:58:28PM +0200, Vlastimil Babka wrote: > On 10/10/25 10:39, kernel test robot wrote: > > > > > > Hello, > > > > kernel test robot noticed "BUG_kmalloc-#(Not_tainted):Freepointer_corrupt" on: > > > > commit: af92793e52c3a99b828ed4bdd277fd3e11c18d08 ("slab: Introduce kmalloc_nolock() and kfree_nolock().") > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > > > [test failed on linus/master ec714e371f22f716a04e6ecb2a24988c92b26911] > > [test failed on linux-next/master 0b2f041c47acb45db82b4e847af6e17eb66cd32d] > > [test failed on fix commit 83d59d81b20c09c256099d1c15d7da21969581bd] > > > > in testcase: trinity > > version: trinity-i386-abe9de86-1_20230429 > > with following parameters: > > > > runtime: 300s > > group: group-01 > > nr_groups: 5 > > > > > > > > config: i386-randconfig-012-20251004 > > compiler: gcc-14 > > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > > > (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/202510101652.7921fdc6-lkp@intel.com > > Does this fix it? yes, this fixed the issue we reported. thanks Tested-by: kernel test robot > ----8<---- > From 5f467c4e630a7a8e5ba024d31065413bddf22cec Mon Sep 17 00:00:00 2001 > From: Vlastimil Babka > Date: Mon, 13 Oct 2025 16:56:28 +0200 > Subject: [PATCH] slab: fix clearing freelist in free_deferred_objects() > > Signed-off-by: Vlastimil Babka > --- > mm/slub.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/mm/slub.c b/mm/slub.c > index f9f7f3942074..080d27fe253f 100644 > --- a/mm/slub.c > +++ b/mm/slub.c > @@ -6377,15 +6377,16 @@ static void free_deferred_objects(struct irq_work *work) > slab = virt_to_slab(x); > s = slab->slab_cache; > > + > + /* Point 'x' back to the beginning of allocated object */ > + x -= s->offset; > /* > * We used freepointer in 'x' to link 'x' into df->objects. > * Clear it to NULL to avoid false positive detection > * of "Freepointer corruption". > */ > - *(void **)x = NULL; > + set_freepointer(s, x, NULL); > > - /* Point 'x' back to the beginning of allocated object */ > - x -= s->offset; > __slab_free(s, slab, x, x, 1, _THIS_IP_); > } > > -- > 2.51.0 > >