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[209.85.208.52]) by smtp.gmail.com with ESMTPSA id dk20-20020a170906f0d400b00992ab0262c9sm3783881ejb.147.2023.07.22.09.37.14 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 22 Jul 2023 09:37:14 -0700 (PDT) Received: by mail-ed1-f52.google.com with SMTP id 4fb4d7f45d1cf-51e6113437cso4015882a12.2 for ; Sat, 22 Jul 2023 09:37:14 -0700 (PDT) X-Received: by 2002:a05:6402:1a54:b0:516:af22:bcc6 with SMTP id bf20-20020a0564021a5400b00516af22bcc6mr4569899edb.21.1690043834077; Sat, 22 Jul 2023 09:37:14 -0700 (PDT) MIME-Version: 1.0 References: <20230721160528.800311148@linuxfoundation.org> In-Reply-To: From: Linus Torvalds Date: Sat, 22 Jul 2023 09:36:57 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 6.4 000/292] 6.4.5-rc1 review To: Naresh Kamboju , Muchun Song , Alexander Potapenko Cc: Marco Elver , Roman Gushchin , Andrew Morton , Linux-MM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 996DA1C0002 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 8fkyz9ryp8wdbxpi3jetcqkfbcwqsjag X-HE-Tag: 1690043837-750720 X-HE-Meta: U2FsdGVkX184SrXCjoUYBN1G421Uyqv0eeimF5/FWuXqhlF8LAJYQM8eiu0IZoLPUaaHlfw2/Bv9BTmOQIsm5N7dn690kjzxjKornmwUILN8IvP7TaSfQsyycS3bIDifIvuX3+NgYlGezh9qlAWE3j5A2R+MyZBAP/zK5WVOvry8jlXF/5gC1TF0CkWDAYEAQxlTC0Jd/+vtXMNe3kpkIcqA9dGS5zSEPR1ySy1fs/zOmqm072JNLnKQJhNk1qpEEbrm44BVHSwWrU6kuvTANuEQL7uDGt/WzXaOCv+9jV11soidwld5IiZ2GLADSBE+aVSgob+VLNCTsZzsCT+AX/oHLarWBzCA8rr8sc0mqMuPfMnVeSXgG2RN8bWQAuZkc9odp44N2b1gkjOXLcIOP2LY8AjGskOYrSH8aJ+gM8oPO2zOIBPFrTcZdH0sHfskQEMEJdci5Wf/bcMNAnsR4fvseif4OD19ODZIcW1eJ7gG5d8JYy9UjbbsL7371ZhQxqfddb9GbubGF4QapjjIIxd6PstL+UNksvX5So/9GEkgY8d3P17pMo3aVI6U14x4OmHhDnNZSYdwfCxD/g1CDnXjmhyZWxyFIV4t4EAUoyhorBBsq6ua5wA5l7sHZvkD/oOfbFJtc0DNAg908UVV4Hx15o8ervkImXQMh1kIYbc/+cSkoGGGXUEKYhFqbJrpK2zyTTAKsN2t1fK/FwSE+ZUq+xdqg3XYs1+hGBAjNnw1legCV4mSxLxOHQEgYLAwuGZOi8Y7bvEd6JW2E2A7x+Av7JBo70k1njzqJGLoplsTNzpJKBXxFcAAerdQQo0awYAy9158zGcHFdRVe3tZbPWbOIZ5RZnWmlZCeFAzoPpK3Hs3gbEAhcBscIcaqQet8TfBNg6jHr3oneDcZOlJO7CiGOtBTRYQ+3KEgnBsj2KN0geabWHC5uz6z9p8eBx+vXjpyXE0/X457U9QXMn vfkKVbTy 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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: [ Removed the stable reviewers, bringing in the kfence people ] See https://lore.kernel.org/lkml/CA+G9fYvgy22wiY=3Dc3wLOrCM6o33636abhtEynXhJk= qxJh4ca0A@mail.gmail.com/ for the original report. The warning was introduced in 8f0b36497303 ("mm: kfence: fix objcgs vector allocation"), and Google doesn't find any other cases of this. Anybody? Linus On Sat, 22 Jul 2023 at 01:06, Naresh Kamboju wr= ote: > > Results from Linaro=E2=80=99s test farm. > No regressions on arm64, arm, x86_64, and i386. > > Tested-by: Linux Kernel Functional Testing > > NOTE: > The following kernel warning was noticed while booting qemu-arm64 > with these configs enabled on stable rc 6.4.5-rc1. > > CONFIG_ARM64_64K_PAGES=3Dy > CONFIG_KFENCE=3Dy > > This crash is not easily reproducible. > > boot logs: > -------- > [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x000f0510] > [ 0.000000] Linux version 6.4.5-rc1 (tuxmake@tuxmake) > (aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils > for Debian) 2.40) #1 SMP PREEMPT @1689957802 > [ 0.000000] random: crng init done > [ 0.000000] Machine model: linux,dummy-virt > ... > [ 0.006821] kfence: initialized - using 33554432 bytes for 255 > objects at 0x(____ptrval____)-0x(____ptrval____) > ... > [ 7.726994] ------------[ cut here ]------------ > [ 7.727704] WARNING: CPU: 1 PID: 1 at mm/kfence/core.c:1097 > __kfence_free+0x84/0xc8 ... > [ 7.746478] Call trace: > [ 7.746776] __kfence_free+0x84/0xc8 > [ 7.747134] __slab_free+0x490/0x508 > [ 7.748063] __kmem_cache_free+0x2b4/0x2d0 > [ 7.748377] kfree+0x78/0x140 > [ 7.748638] single_release+0x40/0x60 > [ 7.750664] __fput+0x78/0x260 > [ 7.751065] ____fput+0x18/0x30 > [ 7.752086] task_work_run+0x80/0xe0 > [ 7.753122] do_notify_resume+0x200/0x1398 > [ 7.754292] el0_svc+0xec/0x100 > [ 7.754573] el0t_64_sync_handler+0xf4/0x120 > [ 7.755559] el0t_64_sync+0x190/0x198