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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