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 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
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