linux-kernel - Re: [PATCHv3 02/10] ext4: Fix ext4_fc

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Message-ID: <20220317143846.7148d0cb@gandalf.local.home>
Date:   Thu, 17 Mar 2022 14:38:46 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sven Schnelle <svens@...ux.ibm.com>
Cc:     Ritesh Harjani <riteshh@...ux.ibm.com>, linux-ext4@...r.kernel.org,
        Jan Kara <jack@...e.cz>, "Theodore Ts'o" <tytso@....edu>,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...nel.org, hca@...ux.ibm.com
Subject: Re: [PATCHv3 02/10] ext4: Fix ext4_fc_stats trace point

On Thu, 17 Mar 2022 17:11:42 +0100
Sven Schnelle <svens@...ux.ibm.com> wrote:


> Looking at the oops output again made me realizes that the snprintf
> tries to write into pages that are mapped RO. Talking to Heiko he
> mentioned that s390 maps rodata/text RO when setting up the initial
> mapping while x86 has a RW mapping in the beginning and changes that
> later to RO. I haven't verified that, but that might be a reason why it
> works on x86.
> 

Yes, I discovered this too. I'm currently looking to see how to fix it.

-- Steve