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[130.111.218.23]) by smtp.gmail.com with ESMTPSA id d88sm9020495qkj.25.2018.05.01.06.29.41 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 01 May 2018 06:29:41 -0700 (PDT) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Tue, 1 May 2018 09:29:38 -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: perf: fuzzer causes stack going in wrong direction warnings In-Reply-To: <20180111192112.d35nkotzklicd27c@treble> Message-ID: References: <20180109132602.GA2369@hirez.programming.kicks-ass.net> <20180109151253.GK6176@hirez.programming.kicks-ass.net> <20180109153341.GL6176@hirez.programming.kicks-ass.net> <20180109160551.GK3040@hirez.programming.kicks-ass.net> <20180109170716.bqmexpmywwr4bwuv@treble> <20180111052538.2qhj6oxnc24xumhk@treble> <20180111192112.d35nkotzklicd27c@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 Hello I reported this back in January, but I think it got lost since everyone was busy with other more pressing matters. But in any case, the perf_fuzzer still can trigger these type of messages and just wanted to see if they were a cause for concern, or just noise. [66620.496076] WARNING: can't dereference registers at 0000000051f78a40 for ip interrupt_entry+0xba/0xc0 [66620.506117] WARNING: stack recursion on stack type 4 [67126.898984] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xd/0x90 [67148.214712] WARNING: can't dereference iret registers at 00000000c8f3c864 for ip error_exit+0x20/0x20 Vince