From: Oleg Nesterov <oleg@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: Jeff Layton <jlayton@redhat.com>,
"Myklebust, Trond" <Trond.Myklebust@netapp.com>,
Mandeep Singh Baines <msb@chromium.org>,
Ming Lei <ming.lei@canonical.com>,
"J. Bruce Fields" <bfields@fieldses.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>, Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: LOCKDEP: 3.9-rc1: mount.nfs/4272 still has locks held!
Date: Wed, 6 Mar 2013 19:16:08 +0100 [thread overview]
Message-ID: <20130306181608.GA18687@redhat.com> (raw)
In-Reply-To: <20130305234700.GE1227@htj.dyndns.org>
On 03/05, Tejun Heo wrote:
>
> Oleg, are you still opposed to the idea of making freezer share trap
> points with ptrace?
My memory can fool me, but iirc I wasn't actually opposed... I guess
you mean the previous discussion about vfork/ptrace/etc which I forgot
completely.
But I can recall the main problem with your idea (with me): I simply
wasn't able to understand it ;)
Likewise, I can't really understand the ideas discussed in this thread.
At least when it come to this particular problem, rpc_wait_bit_killable()
is not interruptible...
And how SIGFREEZE can help? If we want to interrupt the sleeps in NFS/RPC
layer we can simply add TASK_WAKEFREEZE (can be used with TASK_KILLABLE)
and change freeze_task() to do signal_wake_up_state(TASK_WAKEFREEZE).
But if we can do this, then it should be possible so simply make these
sleeps TASK_INTERRUPTIBLE ? But it seems that we can't just because we
can't always restart, so I am totally confused.
Oleg.
next prev parent reply other threads:[~2013-03-06 18:18 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-04 13:57 LOCKDEP: 3.9-rc1: mount.nfs/4272 still has locks held! Ming Lei
2013-03-04 14:14 ` Myklebust, Trond
2013-03-04 14:23 ` Jeff Layton
2013-03-04 19:55 ` Mandeep Singh Baines
2013-03-04 20:53 ` Oleg Nesterov
2013-03-04 22:08 ` Myklebust, Trond
2013-03-05 13:23 ` Jeff Layton
2013-03-05 17:46 ` Tejun Heo
2013-03-05 17:49 ` Tejun Heo
2013-03-05 19:03 ` Jeff Layton
2013-03-05 19:09 ` Tejun Heo
2013-03-05 23:39 ` Jeff Layton
2013-03-05 23:47 ` Tejun Heo
2013-03-06 18:16 ` Oleg Nesterov [this message]
2013-03-06 18:53 ` Tejun Heo
2013-03-06 21:00 ` Linus Torvalds
2013-03-06 21:24 ` Tejun Heo
2013-03-06 21:31 ` Linus Torvalds
2013-03-06 21:36 ` Tejun Heo
2013-03-06 21:40 ` Tejun Heo
2013-03-13 15:17 ` Jeff Layton
2013-03-31 0:07 ` Paul Walmsley
2013-03-07 11:41 ` Jeff Layton
2013-03-07 15:25 ` Tejun Heo
2013-03-07 15:55 ` Linus Torvalds
2013-03-07 15:59 ` Myklebust, Trond
2013-03-07 16:25 ` Linus Torvalds
2013-03-07 16:45 ` Myklebust, Trond
2013-03-07 17:03 ` Linus Torvalds
2013-03-07 17:16 ` Myklebust, Trond
2013-03-07 21:43 ` Jeff Layton
2013-03-08 14:01 ` Ingo Molnar
2013-03-07 20:55 ` Rafael J. Wysocki
2013-03-07 16:00 ` Tejun Heo
2013-03-06 18:17 ` Oleg Nesterov
2013-03-06 18:40 ` Jeff Layton
2013-03-06 18:45 ` Tejun Heo
2013-03-06 1:10 ` Myklebust, Trond
2013-03-06 1:14 ` Tejun Heo
2013-03-06 1:28 ` Tejun Heo
2013-03-06 12:00 ` Jeff Layton
2013-03-05 23:11 ` J. Bruce Fields
2013-03-06 0:02 ` Rafael J. Wysocki
2013-03-06 0:30 ` [PATCH] lockdep: make lock held while freezing check optional Mandeep Singh Baines
2013-03-07 12:03 ` Maarten Lankhorst
2013-03-06 0:59 ` LOCKDEP: 3.9-rc1: mount.nfs/4272 still has locks held! Mandeep Singh Baines
2013-03-06 1:05 ` J. Bruce Fields
2013-03-06 1:16 ` Tejun Heo
2013-03-06 3:11 ` Mandeep Singh Baines
2013-03-06 9:09 ` Ingo Molnar
2013-03-06 12:06 ` Jeff Layton
2013-03-06 15:59 ` Mandeep Singh Baines
2013-03-06 18:23 ` Jeff Layton
2013-03-06 18:37 ` Myklebust, Trond
2013-03-06 20:15 ` Mandeep Singh Baines
2013-03-04 14:40 ` Ming Lei
2013-03-04 15:04 ` Jeff Layton
2013-03-04 15:33 ` Ming Lei
2013-03-04 15:53 ` Myklebust, Trond
2013-03-04 20:09 ` Mandeep Singh Baines
2013-03-04 20:10 ` Mandeep Singh Baines
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