Date: Thu, 7 Mar 2013 10:20:01 GMT From: "Charbon, Julien" <jcharbon@verisign.com> To: freebsd-net@FreeBSD.org Subject: Re: kern/176446: [netinet] [patch] Concurrency in ixgbe driving out-of-order packet process and spurious RST Message-ID: <201303071020.r27AK1k7040961@freefall.freebsd.org>
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The following reply was made to PR kern/176446; it has been noted by GNATS.
From: "Charbon, Julien" <jcharbon@verisign.com>
To: John Baldwin <jhb@freebsd.org>
Cc: bug-followup@freebsd.org,
"De La Gueronniere, Marc" <mdelagueronniere@verisign.com>
Subject: Re: kern/176446: [netinet] [patch] Concurrency in ixgbe driving out-of-order
packet process and spurious RST
Date: Thu, 07 Mar 2013 11:11:25 +0100
On 2/28/13 8:10 PM, Charbon, Julien wrote:
> On 2/28/13 4:57 PM, John Baldwin wrote:
>> Can you try the fixes from http://svnweb.freebsd.org/base?view=revision&revision=240968?
>
> Actually, Marc (I CC'ed him) did find the r240968 fix for concurrency
> between ixgbe_msix_que() and ixgbe_handle_que(), and made a backport for
> release-8.3.0 (see patch [1] below). However, the issue was still
> reproducible, then Marc found another place for concurrency from
> ixgbe_local_timer() and fix it (see patch [2]). But it was still not
> enough, and he found a last place for concurrency due to
> ixgbe_rearm_queues() call (see patch [3]). We all these patches
> applied, we were not able to reproduce this issue.
Just for the record: As expected this issue is reproducible on
9.1-RELEASE:
# uname -a
FreeBSD atlas 9.1-RELEASE FreeBSD 9.1-RELEASE #1 r247851M: Wed Mar 6
11:17:43 UTC 2013
jcharbon@atlas:/usr/obj/app/jcharbon/9.1.0/sys/GENERIC amd64
Enable TCP debug log:
# sysctl net.inet.tcp.log_debug=1
Load enough a TCP service and due to ixgbe race conditions between
ixgbe_msix_que() and ixgbe_handle_que(), you will get:
Mar 7 10:01:04 atlas kernel: TCP: [192.168.100.21]:12918 to
[192.168.100.152]:8080; syncache_socket: in_pcbconnect failed with error 48
Mar 7 10:01:04 atlas kernel: TCP: [192.168.100.21]:12918 to
[192.168.100.152]:8080 tcpflags 0x10<ACK>; tcp_input: Listen socket:
Socket allocation failed due to limits or memory shortage, sending RST
Mar 7 10:01:04 atlas kernel: TCP: [192.168.100.21]:12918 to
[192.168.100.152]:8080 tcpflags 0x4<RST>; syncache_chkrst: Spurious RST
without matching syncache entry (possibly syncookie only), segment ignored
We will provide our current fix patch for 9.1-RELEASE.
--
Julien
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