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Wed, 23 Oct 2019 06:53:23 -0700 (PDT) Received: from uranus.localdomain ([5.18.199.94]) by smtp.gmail.com with ESMTPSA id q14sm9550178ljc.7.2019.10.23.06.53.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Oct 2019 06:53:21 -0700 (PDT) Received: by uranus.localdomain (Postfix, from userid 1000) id C14FB4610AC; Wed, 23 Oct 2019 16:53:20 +0300 (MSK) Date: Wed, 23 Oct 2019 16:53:20 +0300 From: Cyrill Gorcunov To: Thomas Gleixner Cc: LKML , Ingo Molnar , Peter Zijlstra , linux-mm@kvack.org, Catalin Marinas Subject: Re: [BUG -tip] kmemleak and stacktrace cause page faul Message-ID: <20191023135320.GJ12121@uranus.lan> References: <20191019114421.GK9698@uranus.lan> <20191022142325.GD12121@uranus.lan> <20191022145619.GE12121@uranus.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Oct 23, 2019 at 03:47:57PM +0200, Thomas Gleixner wrote: > > And you are right this happens because cea_exception_stacks is not yet > initialized which makes begin = 0 and therefore point into nirvana. > > So the fix is trivial. Great! Thanks a lot for sych detailed analysis! I'll test the patch.