From: Oleg Nesterov <oleg@redhat.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Arjan van de Ven <arjan@linux.intel.com>,
Rusty Russell <rusty@rustcorp.com.au>, Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: + kmod-avoid-deadlock-by-recursive-kmod-call.patch added to -mm tree
Date: Thu, 26 Jan 2012 18:56:12 +0100 [thread overview]
Message-ID: <20120126175612.GA24011@redhat.com> (raw)
> @@ -449,6 +460,16 @@ int call_usermodehelper_exec(struct subp
> retval = -EBUSY;
> goto out;
> }
> + /*
> + * Worker thread must not wait for khelper thread at below
> + * wait_for_completion() if the thread was created with CLONE_VFORK
> + * flag, for khelper thread is already waiting for the thread at
> + * wait_for_completion() in do_fork().
> + */
> + if (wait != UMH_NO_WAIT && current == kmod_thread_locker) {
> + retval = -EBUSY;
> + goto out;
> + }
So, this is because khelper_wq's max_active == 1.
Can't we simply kill khelper_wq and use system_unbound_wq instead?
Oleg.
next reply other threads:[~2012-01-26 19:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-26 17:56 Oleg Nesterov [this message]
2012-01-27 2:55 ` + kmod-avoid-deadlock-by-recursive-kmod-call.patch added to -mm tree Rusty Russell
2012-01-27 14:32 ` Oleg Nesterov
2012-01-29 0:49 ` Rusty Russell
2012-01-29 16:31 ` Oleg Nesterov
2012-01-29 23:26 ` Rusty Russell
2012-01-30 0:25 ` Tejun Heo
2012-01-30 13:03 ` Oleg Nesterov
2012-01-30 17:28 ` Tejun Heo
2012-02-03 18:00 ` Oleg Nesterov
2012-02-03 19:26 ` Tejun Heo
2012-02-04 12:56 ` + kmod-avoid-deadlock-by-recursive-kmod-call.patch added to-mm tree Tetsuo Handa
2012-02-06 17:19 ` Oleg Nesterov
2012-01-30 12:38 ` + kmod-avoid-deadlock-by-recursive-kmod-call.patch added to -mm tree Oleg Nesterov
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