linux-kernel - Re: [PATCH v5] eventfs: Remove eventfs_file and just use eventfs

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Date:   Thu, 23 Nov 2023 10:23:49 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Heiko Carstens <hca@...ux.ibm.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ajay Kaher <akaher@...are.com>, chinglinyu@...gle.com,
        lkp@...el.com, namit@...are.com, oe-lkp@...ts.linux.dev,
        amakhalov@...are.com, er.ajay.kaher@...il.com,
        srivatsa@...il.mit.edu, tkundu@...are.com, vsirnapalli@...are.com,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH v5] eventfs: Remove eventfs_file and just use
 eventfs_inode

On Thu, 23 Nov 2023 12:25:48 +0100
Heiko Carstens <hca@...ux.ibm.com> wrote:

> So, if it helps (this still happens with Linus' master branch):
> 
> create_dir_dentry() is called with a "struct eventfs_inode *ei" (second
> parameter), which points to a data structure where "is_freed" is 1. Then it
> looks like create_dir() returned "-EEXIST". And looking at the code this
> combination then must lead to d_invalidate() incorrectly being called with
> "-EEXIST" as dentry pointer.

I haven't looked too much at the error codes, let me do that on Monday
(it's currently Turkey weekend here in the US).

But could you test this branch:

  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git  trace/core

I have a bunch of fixes in that branch that may fix your issue. I just
finished testing it and plan on pushing it to Linus before the next rc
release.

Thanks!

-- Steve


> 
> Now, I have no idea how the code should work, but it is quite obvious that
> something is broken :)
> 
> Here the dump of the struct eventfs_inode that was passed to
> create_file_dentry() when the crash happened: