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owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jan 23, 2026 at 03:21:19PM +0800, kernel test robot wrote: > > > Hello, > > kernel test robot noticed "BUG_kmalloc-#:Padding_overwritten.#-#@offset=" on: > > commit: 4fad56bdb6b4c4bc0ea2d919df1ae4eef7b69919 ("mm/slab: save memory by allocating slabobj_ext array from leftover") > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git > > [test failed on linux-next/master e3b32dcb9f23e3c3927ef3eec6a5842a988fb574] > > in testcase: boot > > config: x86_64-randconfig-012-20260121 > compiler: clang-20 > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G > > (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/202601231457.f7b31e09-lkp@intel.com > > > > [ 3.646661][ T0] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** > [ 3.647660][ T0] ********************************************************** > [ 3.648834][ T0] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 > [ 3.651537][ T0] Kernel/User page tables isolation: enabled > [ 3.653242][ T0] ============================================================================= > [ 3.655191][ T0] BUG kmalloc-192 (Tainted: G T ): Padding overwritten. 0xffff88810006c028-0xffff88810006bfff @offset=8232 > [ 3.657925][ T0] ----------------------------------------------------------------------------- > [ 3.657925][ T0] > [ 3.660319][ T0] Padding ffff88810006c028: 00 00 00 00 00 00 00 00 30 c0 06 00 81 88 ff ff ........0....... > [ 3.662476][ T0] Padding ffff88810006c038: 30 c0 06 00 81 88 ff ff 00 00 00 00 00 00 00 00 0............... > [ 3.664649][ T0] Padding ffff88810006c048: 48 c0 06 00 81 88 ff ff 48 c0 06 00 81 88 ff ff H.......H....... > > > The kernel config and materials to reproduce are available at: > https://download.01.org/0day-ci/archive/20260123/202601231457.f7b31e09-lkp@intel.com Thanks for the report! It was very helpful to reproduce the bug. after some printk() debugging, I discovered that the slab being reported allocated the slabobj_ext array via kmalloc. So I added a warning to confirm that the array was allocated from the same slab we're allocating the array for: @@ -2145,6 +2164,12 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, return -ENOMEM; } + unsigned long start = (unsigned long)slab_address(slab); + unsigned long end = start + slab_size(slab); + unsigned long val = (unsigned long)vec; + + WARN_ON_ONCE(val >= start && val < end); and it was hit: WARNING: mm/slub.c:2171 at alloc_slab_obj_exts+0x18a/0x1e0, CPU#0: swapper/0 [...] Call Trace: __alloc_tagging_slab_alloc_hook+0xac/0x220 __kmalloc_cache_noprof+0x196/0x470 ? __kmalloc_cache_noprof+0x200/0x470 ? shrinker_alloc+0xa9/0x3b0 shrinker_alloc+0xa9/0x3b0 vmalloc_init+0x616/0x8f0 [...] I sent a fix to prevent this and confirmed that the fix resolved the reported issue. https://lore.kernel.org/linux-mm/20260124104614.9739-1-harry.yoo@oracle.com/ Thanks! -- Cheers, Harry / Hyeonggon