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Mon, 13 Oct 2025 14:58:28 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id d6SoKpQT7WhHNwAAD6G6ig (envelope-from ); Mon, 13 Oct 2025 14:58:28 +0000 Message-ID: <692b6230-db0c-4369-85f0-539aa1c072bb@suse.cz> Date: Mon, 13 Oct 2025 16:58:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [slab] af92793e52: BUG_kmalloc-#(Not_tainted):Freepointer_corrupt Content-Language: en-US To: kernel test robot , Alexei Starovoitov Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Harry Yoo , kasan-dev@googlegroups.com, cgroups@vger.kernel.org, linux-mm@kvack.org References: <202510101652.7921fdc6-lkp@intel.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <202510101652.7921fdc6-lkp@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspam-User: X-Rspamd-Queue-Id: 806B78000A X-Rspamd-Server: rspam02 X-Stat-Signature: r44f9y4kg9t4w8ar3hjnstsxp6honyf6 X-HE-Tag: 1760367510-476297 X-HE-Meta: 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 gfDw8LE+ g7OmnS+89ylyfjI+g40/uucl7cbvP+gKVyGElpHLw1JQFMDJs98sjUnsIvz5jYMc4wfr4MNIZMcpUCnv+KJVUeLVhOxBgyKaNUcJqDxRj4w+LkA5me8gUXFNrN+1jnHN6P9rspCmOk9sxVC3JdbAt72pB/Pu5n+GNUMs137buEyQkjvai8Sd6JhYugOMw8YQI0Cq42tmE2WaIWsrdPM8bC4XdcBA3Lw46WUU8RvlDmDqtoE0+CbhbRlGHi0o3a3+0A5NaYD0Un1CLtmiuxSQgHgMvgIvOKjnJp4P9iLN6hmrM3Gi2A1t1HN7096xshEG+lGm/f5r/YzmN5EGhDotR2zS4FcDYSejVamM8WSLn//gOJAEqJehz2o1wAsPFbA3q1GgV 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: 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? ----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