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[130.111.218.23]) by smtp.gmail.com with ESMTPSA id h37-v6sm10484709qtc.68.2018.05.04.07.35.53 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 04 May 2018 07:35:54 -0700 (PDT) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Fri, 4 May 2018 10:35:53 -0400 (EDT) X-X-Sender: vince@macbook-air To: Josh Poimboeuf cc: Peter Zijlstra , Ingo Molnar , linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo , Thomas Gleixner , Andy Lutomirski Subject: Re: perf: fuzzer causes stack going in wrong direction warnings In-Reply-To: <20180502205009.codkvscnh4j4hm6b@treble> Message-ID: References: <20180109160551.GK3040@hirez.programming.kicks-ass.net> <20180109170716.bqmexpmywwr4bwuv@treble> <20180111052538.2qhj6oxnc24xumhk@treble> <20180111192112.d35nkotzklicd27c@treble> <20180501135850.enx4waqd5d7yowlj@treble> <20180501220458.p3rgwzh3jcqt4jmm@treble> <20180502205009.codkvscnh4j4hm6b@treble> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2 May 2018, Josh Poimboeuf wrote: > After looking closer, I realized that at least some of these warnings > are due to bad unwind hints in the entry code. Can you try this patch > instead of the last one? with just this new patch applied I still get warnings such as this: [ 469.436218] WARNING: can't dereference registers at 00000000886d9235 for ip apic_timer_interrupt+0xa/0x20 [ 790.499655] WARNING: stack recursion on stack type 2 [ 790.907092] WARNING: stack going in the wrong direction? ip=native_sched_clock+0x9/0x90 [ 3632.876656] WARNING: can't dereference iret registers at 000000001754e5aa for ip nmi_restore+0x16/0x2b [ 3650.161250] WARNING: missing regs for base reg R10 at ip native_sched_clock+0xd/0x90 Vince