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Tue, 22 Oct 2019 07:56:22 -0700 (PDT) Received: from uranus.localdomain ([5.18.199.94]) by smtp.gmail.com with ESMTPSA id k8sm9185096ljg.9.2019.10.22.07.56.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Oct 2019 07:56:21 -0700 (PDT) Received: by uranus.localdomain (Postfix, from userid 1000) id EAF9B460E3F; Tue, 22 Oct 2019 17:56:19 +0300 (MSK) Date: Tue, 22 Oct 2019 17:56:19 +0300 From: Cyrill Gorcunov To: LKML Cc: Ingo Molnar , Thomas Gleixner , Peter Zijlstra , linux-mm@kvack.org, Catalin Marinas Subject: Re: [BUG -tip] kmemleak and stacktrace cause page faul Message-ID: <20191022145619.GE12121@uranus.lan> References: <20191019114421.GK9698@uranus.lan> <20191022142325.GD12121@uranus.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191022142325.GD12121@uranus.lan> User-Agent: Mutt/1.12.1 (2019-06-15) 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: On Tue, Oct 22, 2019 at 05:23:25PM +0300, Cyrill Gorcunov wrote: > > I presume the kmemleak tries to save stack trace too early when estack_pages are not > yet filled. Indeed, at this stage of boot the percpu_setup_exception_stacks has not been called yet and estack_pages full of crap [ 0.157502] stk 0x1008 k 1 begin 0x0 end 0xd000 estack_pages 0xffffffff82014880 ep 0xffffffff82014888 [ 0.159395] estack_pages[0] = 0x0 [ 0.160046] estack_pages[1] = 0x5100000001000 [ 0.160881] estack_pages[2] = 0x0 [ 0.161530] estack_pages[3] = 0x6100000003000 [ 0.162343] estack_pages[4] = 0x0 [ 0.162962] estack_pages[5] = 0x0 [ 0.163523] estack_pages[6] = 0x0 [ 0.164065] estack_pages[7] = 0x8100000007000 [ 0.164978] estack_pages[8] = 0x0 [ 0.165624] estack_pages[9] = 0x9100000009000 [ 0.166448] estack_pages[10] = 0x0 [ 0.167064] estack_pages[11] = 0xa10000000b000 [ 0.168055] estack_pages[12] = 0x0 [ 0.168891] BUG: unable to handle page fault for address: 0000000000001ff0