netdev - Re: [RFC] random SYN drops causing connect() delays

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]

Date:	Mon, 12 Apr 2010 04:39:03 -0400
From:	Thomas Graf <tgraf@...radead.org>
To:	netdev@...r.kernel.org
Subject: Re: [RFC] random SYN drops causing connect() delays

On Mon, Apr 12, 2010 at 04:06:33AM -0400, Thomas Graf wrote:
>  - While the issue is appearing, the acceptq seems to be overflowing. Both
>    LISTENOVERFLOWS and LISTENDROPS are increasing although not by the exact
>    number of delay occurences. inetdiag reports sk_max_ack_backlog to be 0
>    therefore one possibility that comes to mind is that sk_ack_backlog
>    underflows due to a race.

Forget about the underflow thought, inetdiag was reporting falsely.
sk_max_ack_backlog is set to 128 as it should and the listen overflow
happens normally. Still the fact remains that while the issue is appearing
listen overflows are counted.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html