From: "Theodore Ts'o" <tytso@mit.edu>
To: Andreas Dilger <adilger@dilger.ca>
Cc: "Nam Cao" <namcao@linutronix.de>,
"Björn Töpel" <bjorn@kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Christian Brauner" <brauner@kernel.org>,
"Jan Kara" <jack@suse.cz>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linux-riscv@lists.infradead.org,
"Ext4 Developers List" <linux-ext4@vger.kernel.org>,
"Conor Dooley" <conor@kernel.org>
Subject: Re: riscv32 EXT4 splat, 6.8 regression?
Date: Sat, 13 Apr 2024 22:04:57 -0400 [thread overview]
Message-ID: <20240414020457.GI187181@mit.edu> (raw)
In-Reply-To: <22E65CA5-A2C0-44A3-AB01-7514916A18FC@dilger.ca>
On Sat, Apr 13, 2024 at 07:46:03PM -0600, Andreas Dilger wrote:
> This looks like a straight-forward mathematical substitution of "dlimit"
> with "search_buf + buf_size" and rearranging of the terms to make the
> while loop offset "zero based" rather than "address based" and would
> avoid overflow if "search_buf" was within one 4kB block of overflow:
>
> dlimit = search_buf + buf_size = 0xfffff000 + 0x1000 = 0x00000000
Umm... maybe, but does riscv32 actually have a memory map where a
kernel page would actually have an address in high memory like that?
That seems.... unusual.
If we have a reliable reproduction, can someone actually printk the
address or test to see if this theory is correct?
- Ted
next prev parent reply other threads:[~2024-04-14 2:05 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 14:57 riscv32 EXT4 splat, 6.8 regression? Björn Töpel
2024-04-12 15:43 ` Theodore Ts'o
2024-04-12 16:59 ` Björn Töpel
2024-04-13 4:35 ` Theodore Ts'o
2024-04-13 10:01 ` Conor Dooley
2024-04-13 14:43 ` Nam Cao
2024-04-14 0:24 ` Theodore Ts'o
2024-04-14 1:46 ` Andreas Dilger
2024-04-14 2:04 ` Theodore Ts'o [this message]
2024-04-14 2:18 ` Al Viro
2024-04-14 2:15 ` Al Viro
2024-04-14 4:16 ` Andreas Dilger
2024-04-14 14:08 ` Björn Töpel
2024-04-15 13:04 ` Christian Brauner
2024-04-15 16:04 ` Björn Töpel
2024-04-16 6:44 ` Nam Cao
2024-04-16 8:25 ` Christian Brauner
2024-04-16 11:02 ` Björn Töpel
2024-04-16 14:24 ` Mike Rapoport
2024-04-16 15:17 ` Nam Cao
2024-04-16 15:30 ` Nam Cao
2024-04-16 15:56 ` Björn Töpel
2024-04-16 16:19 ` Nam Cao
2024-04-16 16:31 ` Mike Rapoport
2024-04-16 17:00 ` Matthew Wilcox
2024-04-16 18:34 ` Mike Rapoport
2024-04-16 22:36 ` Nam Cao
2024-04-17 15:31 ` Theodore Ts'o
2024-04-17 18:06 ` Nam Cao
2024-04-17 19:34 ` Mike Rapoport
2024-04-17 22:09 ` Andreas Dilger
2024-04-18 9:17 ` Nam Cao
2024-04-16 18:05 ` Björn Töpel
2024-04-16 18:09 ` Nam Cao
2024-04-16 16:19 ` Mike Rapoport
2024-04-16 16:31 ` Matthew Wilcox
2024-04-16 18:18 ` Mike Rapoport
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240414020457.GI187181@mit.edu \
--to=tytso@mit.edu \
--cc=adilger@dilger.ca \
--cc=bjorn@kernel.org \
--cc=brauner@kernel.org \
--cc=conor@kernel.org \
--cc=jack@suse.cz \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=namcao@linutronix.de \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).