Date: Thu, 25 Feb 2021 21:00:21 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Michael Tuexen <tuexen@freebsd.org> Cc: "Scheffenegger, Richard" <Richard.Scheffenegger@netapp.com>, "net@FreeBSD.org" <net@freebsd.org> Subject: Re: panic: sackhint bytes rtx >= 0 Message-ID: <e65fe000-4e9f-e8c7-7d3f-7c78ab1a436d@FreeBSD.org> In-Reply-To: <58AED4F6-FBA4-46D5-98D4-DD31BD9A946B@freebsd.org> References: <960081ac-2839-a226-3142-5a4666eb54ad@FreeBSD.org> <8BB910F9-B828-49A2-8941-4F6C6419D8EA@freebsd.org> <SN4PR0601MB37288873BB2967AC78B26C8986809@SN4PR0601MB3728.namprd06.prod.outlook.com> <c03e903f-5386-4c7b-ee95-b558791d6e35@FreeBSD.org> <58AED4F6-FBA4-46D5-98D4-DD31BD9A946B@freebsd.org>
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On 25/02/2021 20:20, Michael Tuexen wrote: >> On 25. Feb 2021, at 19:08, Andriy Gapon <avg@FreeBSD.org> wrote: >> >> On 24/02/2021 00:40, Scheffenegger, Richard wrote: >>> Hi Andriy, >>> >>> I guess I am currently the person who has the most recent knowledge about that >>> part of the base stack… >>> >>> Do you happen to have more (preceding) information about this, or a way to >>> reproduce this? >> Unfortunately, no. It "just happened". >> There was no unusual activity at the time of the crash. >> At least, from a user / administrator perspective. > So you did not use specific TCP stacks or congestion control modules? Correct. The default stack and congestion control (if any). >>> Are you running any special stack (RACK, BBR) which may have switched back to >>> the base stack in the middle of a loss recovery (I suspected at one point that >>> this may cause issues, potentially)? >> I do not have any customizations to the network stack, everything at defaults. >> >>> Or was something done with the ipfw that may have temporarily impacted a tcp >>> session? >> I use pf as a firewall. I did not touch it at the time of the crash. > Does pf change the packets? Not sure. If only this rule: scrub in all fragment reassemble All others are just block and pass (no NAT even). -- Andriy Gapon
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