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[49.181.38.249]) by smtp.gmail.com with ESMTPSA id r5-20020a632b05000000b005d8e280c879sm2137667pgr.84.2024.02.07.13.37.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Feb 2024 13:37:32 -0800 (PST) Received: from dave by dread.disaster.area with local (Exim 4.96) (envelope-from ) id 1rXpbl-003Rb1-23; Thu, 08 Feb 2024 08:37:29 +1100 Date: Thu, 8 Feb 2024 08:37:29 +1100 From: Dave Chinner To: Miklos Szeredi Cc: lsf-pc , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [LSF/MM/BPF TOPIC] tracing the source of errors Message-ID: References: Precedence: bulk X-Mailing-List: linux-fsdevel@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: On Wed, Feb 07, 2024 at 10:54:34AM +0100, Miklos Szeredi wrote: > [I'm not planning to attend LSF this year, but I thought this topic > might be of interest to those who will.] > > The errno thing is really ancient and yet quite usable. But when > trying to find out where a particular EINVAL is coming from, that's > often mission impossible. > > Would it make sense to add infrastructure to allow tracing the source > of errors? E.g. > > strace --errno-trace ls -l foo > ... > statx(AT_FDCWD, "foo", ...) = -1 ENOENT [fs/namei.c:1852] > ... > > Don't know about others, but this issue comes up quite often for me. ftrace using the function_graph tracer will emit the return values of the functions if you use it with the 'funcgraph-retval' option. Seems like a solved problem? -Dave. -- Dave Chinner david@fromorbit.com