linux-kernel - Re: [-next regression] TCP window full with EPOLLWAKEUP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <201205201423.08334.rjw@sisk.pl>
Date:	Sun, 20 May 2012 14:23:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	NeilBrown <neilb@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [-next regression] TCP window full with EPOLLWAKEUP

On Sunday, May 20, 2012, Jiri Slaby wrote:
> Hi,
> 
> a bisection shows that with the following commit from -next:
> commit 4d7e30d98939a0340022ccd49325a3d70f7e0238
> Author: Arve Hjønnevåg <arve@...roid.com>
> Date:   Tue May 1 21:33:34 2012 +0200
> 
>     epoll: Add a flag, EPOLLWAKEUP, to prevent suspend while epoll
> events are ready
> 
> ====
> 
> one of mono programs I use stops receiving data from the network.
> Wireshark shows that the TCP window of a connection is filled. This
> means the program does not read the data fast enough after requesting
> the data.
> 
> If I revert that commit on the top of -next (20120518), everything works
> as expected.

Hmm.  I suppose that the failing program doesn't set EPOLLWAKEUP by mistake,
does it?

Rafael
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/