From: Eric Wong <normalperson@yhbt.net>
To: sleepy.penguin@librelist.org
Subject: Re: [sleepy.penguin] [PATCH] epoll: avoid EPOLL_CTL_MOD race condition
Date: Thu, 17 Jan 2013 21:35:59 +0000 [thread overview]
Message-ID: <20130117213559.GA12465@dcvr.yhbt.net> (raw)
In-Reply-To: <20130103041904.GA29931@dcvr.yhbt.net>
Eric Wong <normalperson@yhbt.net> wrote:
> Until everybody updates to a version of the Linux kernel with
> this fix, we need to enable a workaround for older kernels using
> EPOLL_CTL_DEL + EPOLL_CTL_ADD to emulate EPOLL_CTL_MOD behavior.
>
> This race condition is fixed in Linux upstream
> commit 128dd1759d96ad36c379240f8b9463e8acfd37a1 and included in
> Linux v3.8-rc2 and later.
Linux 3.7.3, 3.4.26, 3.2.37, 3.0.59 all have this fix already.
Linux 3.5.7.3 will also have this.
> This fix will likely be backported to stable and vendor kernels,
> so we'll whitelist them as we learn of them.
I've reverted this workaround (and pushed to master @
git://bogomips.org/sleepy_penguin.git )
commit b3fa14976bc41c2daad0b8a6afd74a8212dcb97b
Author: Eric Wong <normalperson@yhbt.net>
Date: Thu Jan 17 21:30:30 2013 +0000
Revert "epoll: avoid EPOLL_CTL_MOD race condition"
This reverts commit 02e5a91b24983d96b342c007661966495ccdb619.
This workaround may have unintended side-effects for apps using
EPOLL_CTL_DEL.
--
Eric Wong
prev parent reply other threads:[~2013-01-17 21:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-03 4:19 [sleepy.penguin] [PATCH] epoll: avoid EPOLL_CTL_MOD race condition Eric Wong
2013-01-17 21:35 ` Eric Wong [this message]
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