From: Jan Kara <jack@suse.cz>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: lsf-pc <lsf-pc@lists.linux-foundation.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [Lsf-pc] [LSF/MM/BPF TOPIC] tracing the source of errors
Date: Wed, 7 Feb 2024 12:00:41 +0100 [thread overview]
Message-ID: <20240207110041.fwypjtzsgrcdhalv@quack3> (raw)
In-Reply-To: <CAJfpegtw0-88qLjy0QDLyYFZEM7PJCG3R-mBMa9s8TNSVZmJTA@mail.gmail.com>
On Wed 07-02-24 10:54:34, Miklos Szeredi via Lsf-pc 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.
Yes, having this available would be really useful at times. Sometimes I
had to resort to kprobes or good old printks.
> I would implement this with macros that record the place where a
> particular error has originated, and some way to query the last one
> (which wouldn't be 100% accurate, but good enough I guess).
The problem always has been how to implement this functionality in a
transparent way so the code does not become a mess. So if you have some
idea, I'd say go for it :)
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2024-02-07 11:00 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-07 9:54 [LSF/MM/BPF TOPIC] tracing the source of errors Miklos Szeredi
2024-02-07 11:00 ` Jan Kara [this message]
2024-02-07 11:23 ` [Lsf-pc] " Miklos Szeredi
2024-02-07 12:00 ` Matthew Wilcox
2024-02-07 12:19 ` Miklos Szeredi
2024-02-08 20:47 ` Gabriel Krisman Bertazi
2024-02-07 19:29 ` Eric Sandeen
2024-02-08 20:39 ` Gabriel Krisman Bertazi
2024-02-07 17:16 ` Darrick J. Wong
2024-02-07 21:37 ` Dave Chinner
2024-02-08 9:09 ` Miklos Szeredi
2024-02-09 2:27 ` Dave Chinner
2024-02-08 15:57 ` Matthew Wilcox
2024-02-09 1:55 ` Dave Chinner
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