From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] 2.4.25: BUG(): Use guard page instead of page 0
Date: Thu, 19 Feb 2004 01:14:59 +0000 [thread overview]
Message-ID: <16436.3603.827198.821944@napali.hpl.hp.com> (raw)
In-Reply-To: <20040218221302.GA87364@dragonfly.csd.sgi.com>
>>>>> On Wed, 18 Feb 2004 14:13:03 -0800, Jason Uhlenkott <jasonuhl@sgi.com> said:
Jason> The ia64 BUG macro deliberately writes to address 0 in order to
Jason> trigger a page fault and an Oops. This won't work if the process has
Jason> mapped something into page zero: We'll just print the "kernel BUG"
Jason> message and continue (after having stomped on whatever user memory was
Jason> at address 0).
Jason> A solution is to write to the guard page in region 5, which is
Jason> guaranteed to trigger a page fault.
The 2.6 kernel uses __builtin_trap(), which is even better (when available).
--david
next prev parent reply other threads:[~2004-02-19 1:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-18 22:13 [PATCH] 2.4.25: BUG(): Use guard page instead of page 0 Jason Uhlenkott
2004-02-19 1:14 ` David Mosberger [this message]
2004-03-04 23:25 ` Bjorn Helgaas
2004-03-04 23:41 ` Keith Owens
2004-03-04 23:57 ` Bjorn Helgaas
2004-03-05 0:05 ` David Mosberger
2004-03-05 0:06 ` David Mosberger
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=16436.3603.827198.821944@napali.hpl.hp.com \
--to=davidm@napali.hpl.hp.com \
--cc=linux-ia64@vger.kernel.org \
/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