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X-CSE-ConnectionGUID: RTGCQBQCQVSHDliSAXngEw== X-CSE-MsgGUID: uQ6GHpVSSL2N8UYmlolWmA== X-IronPort-AV: E=McAfee;i="6800,10657,11904"; a="212481" X-IronPort-AV: E=Sophos;i="6.27,100,1787036400"; d="scan'208";a="212481" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa116.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2026 18:12:58 -0700 X-CSE-ConnectionGUID: 7656NU3GTc+jUBivSd/cfw== X-CSE-MsgGUID: 9WjpqR0LRyOJYmSSktPxAA== X-ExtLoop1: 1 Received: from dwoodwor-mobl2.amr.corp.intel.com (HELO [10.125.108.110]) ([10.125.108.110]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2026 18:12:58 -0700 Message-ID: <3e4f6c01-012b-4730-b34d-d8264772f770@intel.com> Date: Sun, 13 Sep 2026 18:12:57 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [GIT PULL] x86/urgent for 7.4-rc4 To: Linus Torvalds Cc: Dave Hansen , x86@kernel.org, linux-kernel@vger.kernel.org, Vernon Yang , Rick Edgecombe , Orson Peters References: <20260913225356.1033865-1-dave.hansen@linux.intel.com> <2a15ec49-7b83-4881-a9ec-a1193602eb4f@intel.com> Content-Language: en-US From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/13/26 18:04, Linus Torvalds wrote: > On Sun, 13 Sept 2026 at 17:18, Dave Hansen wrote: ... > This does not seem to be a bug in MADV_FREE at all, and isn't even > really related to MADV_FREE. I think MADV_FREE just happened to be a > way to trigger it. Ahh, I see your point. Agreed. It's really about mprotect() on a PMD versus the dirty bit. > I'd love for somebody to hit me with a clue hammer on how this all > happened, but I guess that's not required for the fix. Rick dug back in some old versions of the shadow stack patches to look for the origin: > https://lore.kernel.org/lkml/c15c2b17e110782d966751dbf3c487a6db837a87.camel@intel.com/ It does seem to just be cruft from old versions that snuck through as opposed to something intentional.