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Mon, 26 Aug 2024 20:27:29 +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 n7gYEzHlzGZkRwAAD6G6ig (envelope-from ); Mon, 26 Aug 2024 20:27:29 +0000 Message-ID: <4fbe9507-13b9-4af5-88c3-63379835f386@suse.cz> Date: Mon, 26 Aug 2024 22:27:29 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [linux-next:master] [slub] 3a34e8ea62: BUG:KASAN:slab-use-after-free_in_kmem_cache_rcu_uaf Content-Language: en-US To: Jann Horn , kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Andrey Konovalov , Marco Elver , kasan-dev@googlegroups.com References: <202408251741.4ce3b34e-oliver.sang@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+fMgqZkBQJkBREIBQkRadznAAoJECJPp+fMgqZkNxIQ ALZRqwdUGzqL2aeSavbum/VF/+td+nZfuH0xeWiO2w8mG0+nPd5j9ujYeHcUP1edE7uQrjOC Gs9sm8+W1xYnbClMJTsXiAV88D2btFUdU1mCXURAL9wWZ8Jsmz5ZH2V6AUszvNezsS/VIT87 AmTtj31TLDGwdxaZTSYLwAOOOtyqafOEq+gJB30RxTRE3h3G1zpO7OM9K6ysLdAlwAGYWgJJ V4JqGsQ/lyEtxxFpUCjb5Pztp7cQxhlkil0oBYHkudiG8j1U3DG8iC6rnB4yJaLphKx57NuQ PIY0Bccg+r9gIQ4XeSK2PQhdXdy3UWBr913ZQ9AI2usid3s5vabo4iBvpJNFLgUmxFnr73SJ KsRh/2OBsg1XXF/wRQGBO9vRuJUAbnaIVcmGOUogdBVS9Sun/Sy4GNA++KtFZK95U7J417/J Hub2xV6Ehc7UGW6fIvIQmzJ3zaTEfuriU1P8ayfddrAgZb25JnOW7L1zdYL8rXiezOyYZ8Fm ZyXjzWdO0RpxcUEp6GsJr11Bc4F3aae9OZtwtLL/jxc7y6pUugB00PodgnQ6CMcfR/HjXlae h2VS3zl9+tQWHu6s1R58t5BuMS2FNA58wU/IazImc/ZQA+slDBfhRDGYlExjg19UXWe/gMcl De3P1kxYPgZdGE2eZpRLIbt+rYnqQKy8UxlszsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZAUSmwUJDK5EZgAKCRAiT6fnzIKmZOJGEACOKABgo9wJXsbWhGWYO7mD 8R8mUyJHqbvaz+yTLnvRwfe/VwafFfDMx5GYVYzMY9TWpA8psFTKTUIIQmx2scYsRBUwm5VI EurRWKqENcDRjyo+ol59j0FViYysjQQeobXBDDE31t5SBg++veI6tXfpco/UiKEsDswL1WAr tEAZaruo7254TyH+gydURl2wJuzo/aZ7Y7PpqaODbYv727Dvm5eX64HCyyAH0s6sOCyGF5/p eIhrOn24oBf67KtdAN3H9JoFNUVTYJc1VJU3R1JtVdgwEdr+NEciEfYl0O19VpLE/PZxP4wX PWnhf5WjdoNI1Xec+RcJ5p/pSel0jnvBX8L2cmniYnmI883NhtGZsEWj++wyKiS4NranDFlA HdDM3b4lUth1pTtABKQ1YuTvehj7EfoWD3bv9kuGZGPrAeFNiHPdOT7DaXKeHpW9homgtBxj 8aX/UkSvEGJKUEbFL9cVa5tzyialGkSiZJNkWgeHe+jEcfRT6pJZOJidSCdzvJpbdJmm+eED w9XOLH1IIWh7RURU7G1iOfEfmImFeC3cbbS73LQEFGe1urxvIH5K/7vX+FkNcr9ujwWuPE9b 1C2o4i/yZPLXIVy387EjA6GZMqvQUFuSTs/GeBcv0NjIQi8867H3uLjz+mQy63fAitsDwLmR EP+ylKVEKb0Q2A== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 201F518000E X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: u3eyn9w7igunf3mkqcitticffy88oujr X-HE-Tag: 1724704050-647729 X-HE-Meta: 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 bSJZd0cS y3956trEI6Fb0gNBjByk3YGYqZkZIxk2VdokwjXaakp8aX+C9V85q8bY8hRthKyaT72mw2LrH0ZCglKMLPSMjCnQVTDe4gtAOhyjx/qLIdO9V6Hh+kX0p/6vb4aQTbirgsn7A7WVkGHG2FH4eQJp6g4JP8fve1bISeBwLuHu8agFBVGToAaNySspq4a2qBpn0tlP7gtYfXeLYmM/Uow0uc369CZr0TC/NTBnxpwI57g4X7iHp2O2UHaJnSKUQ24JFnrhPK8jA676sxu0vhhed9G1P7BG0JZIgh/6Lsk/XL5p0Hv7lqOMMZum8QuB3bZAAdqwkctW3DSlI+lFUUD1jmKBmFx5rOYZl66e7aQtnQTaWMkj514KaacCRl9znpmFT0OqIETsPvD00KUYJDkAOOsH9a4bEco7NLGJ146krDucKkvHAaeM7dmURcU11L5p+vKtRbJqfQSCmp//YdDrYGZjxfvfYK4gl6Pra 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 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. > 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.