From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Igor Mammedov <imammedo@redhat.com>
Cc: Jiang Liu <liuj97@gmail.com>,
linux-kernel@vger.kernel.org, mingo@kernel.org, pjt@google.com,
tglx@linutronix.de, seto.hidetoshi@jp.fujitsu.com
Subject: Re: [PATCH] sched_groups are expected to be circular linked list, make it so right after allocation
Date: Wed, 09 May 2012 13:52:10 +0200 [thread overview]
Message-ID: <1336564330.2527.23.camel@twins> (raw)
In-Reply-To: <4FAA588B.5010404@redhat.com>
On Wed, 2012-05-09 at 13:44 +0200, Igor Mammedov wrote:
> This patch fixes only build_sched_groups path, but there is another fail path
> that results in below OOPS.
> build_overlap_sched_groups() may exit without setting groups and later it will crash
> init_sched_groups_power as well.
if that allocation fails? Or is there another fail path?
> But I just don't know how to fix it, so I've just
> posted partial fix that reduces crash frequency.
> And I have to admit that
> cpu_active_mask and siblings map are busted but we either should not exit from builder
> funcs with NULL group or BUG there if it is impossible to come-up with sane group
> for insane domain span.
I'm perfectly OK with taking the machine down, provided we can output
useful messages as to what is broken first..
next prev parent reply other threads:[~2012-05-09 11:52 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-09 10:38 [PATCH] sched_groups are expected to be circular linked list, make it so right after allocation Igor Mammedov
2012-05-09 10:21 ` Jiang Liu
2012-05-09 11:44 ` Igor Mammedov
2012-05-09 11:52 ` Peter Zijlstra [this message]
2012-05-09 11:58 ` Igor Mammedov
2012-05-09 12:21 ` Peter Zijlstra
2012-05-09 12:22 ` Peter Zijlstra
2012-05-09 12:35 ` Igor Mammedov
2012-05-09 12:30 ` Peter Zijlstra
2012-05-09 13:27 ` [RFC][PATCH] printk: Add %pb to print bitmaps Peter Zijlstra
2012-05-09 13:29 ` Peter Zijlstra
2012-05-09 13:36 ` Ingo Molnar
2012-05-09 13:44 ` Peter Zijlstra
2012-05-09 13:59 ` Peter Zijlstra
2012-05-09 14:15 ` Ingo Molnar
2012-05-09 14:24 ` Peter Zijlstra
2012-05-09 15:32 ` Peter Zijlstra
2012-05-09 15:41 ` Ingo Molnar
2012-05-09 16:06 ` Peter Zijlstra
2012-05-09 16:39 ` Joe Perches
2012-05-09 17:22 ` Ingo Molnar
2012-05-09 17:24 ` Ingo Molnar
2012-05-09 17:25 ` Peter Zijlstra
2012-05-09 17:31 ` Ingo Molnar
2012-05-09 14:19 ` Joe Perches
2012-05-09 15:34 ` Ingo Molnar
2012-05-09 17:15 ` Linus Torvalds
2012-05-09 17:22 ` Peter Zijlstra
2012-05-09 17:26 ` Ingo Molnar
2012-05-09 17:30 ` Peter Zijlstra
2012-05-09 19:07 ` Andrew Morton
2012-05-09 20:58 ` Peter Zijlstra
2012-05-10 7:45 ` Ingo Molnar
2012-05-10 13:26 ` [PATCH] sched_groups are expected to be circular linked list, make it so right after allocation Igor Mammedov
2012-05-10 13:45 ` Peter Zijlstra
2012-05-10 17:01 ` Igor Mammedov
2012-05-10 17:33 ` Peter Zijlstra
2012-05-09 10:35 ` [tip:sched/urgent] sched: Fix KVM and ia64 boot crash due to sched_groups circular linked list assumption tip-bot for Igor Mammedov
2012-05-09 11:41 ` [PATCH] sched_groups are expected to be circular linked list, make it so right after allocation Peter Zijlstra
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=1336564330.2527.23.camel@twins \
--to=a.p.zijlstra@chello.nl \
--cc=imammedo@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=liuj97@gmail.com \
--cc=mingo@kernel.org \
--cc=pjt@google.com \
--cc=seto.hidetoshi@jp.fujitsu.com \
--cc=tglx@linutronix.de \
/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