LKML Archive on
help / color / mirror / Atom feed
From: Cedric Le Goater <>
To: "Serge E. Hallyn" <>
	"Eric W. Biederman" <>,
	Oleg Nesterov <>,
	Daniel Hokka Zakrisson <>,,,,
	Linux Containers <>
Subject: Re: [PATCH] namespaces: fix race at task exit
Date: Thu, 25 Jan 2007 16:20:23 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Serge E. Hallyn wrote:
> In do_exit(), the exit_task_namespaces() was placed after
> exit_notify() because exit_notify ends up using the pid
> namespace both to access the reaper, and for detaching the
> pid.  However, this placement allows an nfs server to reap
> the task before exit_task_namespaces() completes.
> This patch moves the exit_task_namespaces() into release_task,
> below release_thread() which puts the pids(), and just above
> the call_rcu(delayed_put_task_struct).  I believe this should
> solve both problems.
> Signed-off-by: Serge E. Hallyn <>

I've run some tests on x86 and x86_64: mounted a NFS share after 
having unshare(CLONE_NEWNS) and I didn't reproduce the bug Daniel 
had found. 

it looks safe.


  reply	other threads:[~2007-01-25 15:20 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-25 15:05 Serge E. Hallyn
2007-01-25 15:20 ` Cedric Le Goater [this message]
2007-01-25 16:29 ` Eric W. Biederman
2007-01-25 17:35   ` Serge E. Hallyn
2007-01-25 20:36     ` Serge E. Hallyn
2007-01-25 16:39 ` Oleg Nesterov
2007-01-25 17:36   ` Serge E. Hallyn

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:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \ \
    --subject='Re: [PATCH] namespaces: fix race at task exit' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

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).