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[209.85.220.65]) by mx.google.com with SMTPS id 73sor13921031plf.73.2019.02.07.07.34.19 for (Google Transport Security); Thu, 07 Feb 2019 07:34:19 -0800 (PST) Received-SPF: pass (google.com: domain of andreyknvl@google.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=LqyOFZTg; spf=pass (google.com: domain of andreyknvl@google.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=andreyknvl@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8zLBuc0sBo52O4bloIqQvrcyfDP4dPfYY5yzFr1WIjY=; b=LqyOFZTgpwimtcg6h/ifQ1jy7jMNg8xS54lUMHN7OO8i2ohbAmeK8nOG++3dGbHUih cEurY7rJCDqAhQWAPQ63GToV8NK+KhKPEY50YNZOeqRDVZILlwdorLPv+WrxIK406uwa cRgP2cpu4+NCeOxdYKeXESNmumtxrSxsy+Yo/ucpmHz2xEIXN1hHkuBfqKGCbozJmTca ujQW5p+PQNeWO+tKk07FLT9zc4fSLR7LfvKBtmjt7Hecd8OX3vzz9bMzcPQLziS1XB9E lgKaPET3teay1WoaYU9CMZP+PVsboqyv6H7cRVbhRrk8Y6MwP1zPAW89crO3RM0psxi+ bh+Q== X-Google-Smtp-Source: AHgI3IZdDWszJGx7zQzLD8P5tmlbNuB2twIL3Lxhj+0O61Ipu9AXNAoqooq6906pDqScfxcNWeTRRnzsnSOCjIn2ank= X-Received: by 2002:a17:902:8303:: with SMTP id bd3mr9087825plb.10.1549553659042; Thu, 07 Feb 2019 07:34:19 -0800 (PST) MIME-Version: 1.0 References: <89b343eb-16ff-1020-2efc-55ca58fafae7@lca.pw> In-Reply-To: <89b343eb-16ff-1020-2efc-55ca58fafae7@lca.pw> From: Andrey Konovalov Date: Thu, 7 Feb 2019 16:34:06 +0100 Message-ID: Subject: Re: CONFIG_KASAN_SW_TAGS=y NULL pointer dereference at freelist_dereference() To: Qian Cai Cc: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , kasan-dev , Linux ARM , Linux-MM Content-Type: multipart/mixed; boundary="00000000000068e02505814f9370" 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: --00000000000068e02505814f9370 Content-Type: text/plain; charset="UTF-8" On Thu, Feb 7, 2019 at 2:27 PM Qian Cai wrote: > > > > On 2/7/19 7:58 AM, Andrey Konovalov wrote: > > On Thu, Feb 7, 2019 at 5:04 AM Qian Cai wrote: > >> > >> The kernel was compiled by clang-7.0.1 on a ThunderX2 server, and it fails to > >> boot. CONFIG_KASAN_GENERIC=y works fine. > > > > Hi Qian, > > > > Could you share the kernel commit id and .config that you use? > > v5.0-rc5 > > https://git.sr.ht/~cai/linux-debug/tree/master/config > > # cat /proc/cmdline > page_poison=on crashkernel=768M earlycon page_owner=on numa_balancing=enable > slub_debug=- Reproduced, looks like a conflict with CONFIG_SLAB_FREELIST_HARDENED. Could you try the attached patch? --00000000000068e02505814f9370 Content-Type: text/x-patch; charset="US-ASCII"; name="kasan-hardened-freelist-fix.patch" Content-Disposition: attachment; filename="kasan-hardened-freelist-fix.patch" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_jrus7qij0 ZGlmZiAtLWdpdCBhL21tL3NsdWIuYyBiL21tL3NsdWIuYwppbmRleCAxZTNkMGVjNGUyMDAuLjVm Yjc1MDdlYjhkMSAxMDA2NDQKLS0tIGEvbW0vc2x1Yi5jCisrKyBiL21tL3NsdWIuYwpAQCAtMjQ5 LDcgKzI0OSw4IEBAIHN0YXRpYyBpbmxpbmUgdm9pZCAqZnJlZWxpc3RfcHRyKGNvbnN0IHN0cnVj dCBrbWVtX2NhY2hlICpzLCB2b2lkICpwdHIsCiAJCQkJIHVuc2lnbmVkIGxvbmcgcHRyX2FkZHIp CiB7CiAjaWZkZWYgQ09ORklHX1NMQUJfRlJFRUxJU1RfSEFSREVORUQKLQlyZXR1cm4gKHZvaWQg KikoKHVuc2lnbmVkIGxvbmcpcHRyIF4gcy0+cmFuZG9tIF4gcHRyX2FkZHIpOworCXJldHVybiAo dm9pZCAqKSgodW5zaWduZWQgbG9uZylwdHIgXiBzLT5yYW5kb20gXgorCQkJKHVuc2lnbmVkIGxv bmcpa2FzYW5fcmVzZXRfdGFnKCh2b2lkICopcHRyX2FkZHIpKTsKICNlbHNlCiAJcmV0dXJuIHB0 cjsKICNlbmRpZgo= --00000000000068e02505814f9370--