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[37.188.182.96]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab6760fc485sm112075266b.160.2025.01.24.03.23.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jan 2025 03:23:39 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Fri, 24 Jan 2025 12:23:35 +0100 To: Martin KaFai Lau Cc: Ilya Leoshkevich , bpf Subject: Re: [TEST FAILURE] bpf: s390: missed/kprobe_recursion Message-ID: References: <3c841f0a-772a-406c-9888-f8e71826daff@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3c841f0a-772a-406c-9888-f8e71826daff@linux.dev> On Thu, Jan 23, 2025 at 02:32:38PM -0800, Martin KaFai Lau wrote: > Hi Jiri, > > The "missed/kprobe_recursion" fails consistently on s390. It seems to start > failing after the recent bpf and bpf-next tree ffwd. > > An example: > https://github.com/kernel-patches/bpf/actions/runs/12934431612/job/36076956920 > > Can you help to take a look? > > afaict, it only happens on s390 so far, so cc IIya if there is any recent > change that may ring the bell. hi, I need to check more but I wonder it's the: 7495e179b478 s390/tracing: Enable HAVE_FTRACE_GRAPH_FUNC which seems to add recursion check and bail out before we have a chance to trigger it in bpf code jirka