From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Jiri Kosina <jkosina@suse.com>
Cc: ksummit-discuss@lists.linuxfoundation.org
Subject: Re: [Ksummit-discuss] [CORE TOPIC] live patching
Date: Thu, 09 Jul 2015 19:05:51 +0900 [thread overview]
Message-ID: <559E477F.2040801@jp.fujitsu.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1507091155450.10183@pobox.suse.cz>
On 2015/07/09 18:56, Jiri Kosina wrote:
> On Thu, 9 Jul 2015, Kamezawa Hiroyuki wrote:
>
>> I'm sorr if this is off-topic.
>>
>> I think the problem of "freezer v.s. FUSE" will happen if we neet to
>> stop user proceesses. AFAIK, the problem is a deadlock that fuse daemon
>> freezes even while its client wating for a reply.
>>
>> example)
>> client -> page-fault -> GUP -> fuse daemon -> gethostbyname() -> nscd.8
>>
>> We can't detect this kind of dependency if we need to freeze userland.
>
> Freezing of userspace is happening every time system goes through
> hibernation.
>
yes. so, we need to find a way for fixing deadlock or avoiding it.
AFAIK, Hibernation+FUSE problem has been being reported since several years ago.
I think there are some workaround to stop using FUSE before hibernation by
hand or script or systemd but it seems not to be an option for live patching.
Thanks,
-Kame
next prev parent reply other threads:[~2015-07-09 10:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-07 20:42 [Ksummit-discuss] [CORE TOPIC] live patching Jiri Kosina
2015-07-08 16:13 ` Masami Hiramatsu
2015-07-08 21:21 ` Jiri Kosina
2015-07-09 3:26 ` Kamezawa Hiroyuki
2015-07-09 9:56 ` Jiri Kosina
2015-07-09 10:05 ` Kamezawa Hiroyuki [this message]
2015-10-12 17:13 ` Theodore Ts'o
2015-10-13 9:29 ` Jiri Kosina
2015-10-16 19:34 ` Jiri Kosina
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=559E477F.2040801@jp.fujitsu.com \
--to=kamezawa.hiroyu@jp.fujitsu.com \
--cc=jkosina@suse.com \
--cc=ksummit-discuss@lists.linuxfoundation.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.