Date: Wed, 07 Nov 2007 12:55:19 +0200 From: Stefan Lambrev <stefan.lambrev@moneybookers.com> To: freebsd-current@freebsd.org Subject: Re: rtfree: 0xc741ee88 has 1 refs Message-ID: <47319997.6000503@moneybookers.com> In-Reply-To: <47317CDA.5060401@moneybookers.com> References: <472B1E89.5080006@moneybookers.com> <47303578.8060703@moneybookers.com> <4730AA30.7090607@intersonic.se> <473170E6.8020201@moneybookers.com> <47317CDA.5060401@moneybookers.com>
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Hi, I compiled kernel with all debug stuff in it, but I'm not sure what to do next :) I have serial console to the server so I boot with -dDh and enter debig mode. I can enter at debug mode at any time now, so any idea how to catch what trigger this rtfree ? :) I'm following steps from http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-online-ddb.html What info should I provide? Stefan Lambrev wrote: > Hi, > > Just to confirm that after reboot I'm seeing imediately rtfree: %P has > 1 refs. > > I'll recompile kernel with debug and will try to find out more. > > Stefan Lambrev wrote: >> Hi, >> >> Per olof Ljungmark wrote: >>> Stefan Lambrev wrote: >>>> Hi, >>>> >>>> Sorry to reply to myself, but I found that the problem exist only >>>> if the GW is carp interface, e.g. 10.1.1.1 sits on carp0 on default >>>> GW. >>>> I'm still testing how to reproduce this in my test lab and will >>>> fill a PR. >>>> >>>> Stefan Lambrev wrote: >>>>> Hi, >>>>> >>>>> I see rtfree: 0xc741ee88 has 1 refs with freebsd releng_7 (i386) >>>>> from today. >>>>> >>>>> I think it's easy reproducible. What I have is: >>>>> >>>>> releng_7 (10.1.1.2) -> default GW (10.1.1.1) >>>>> on default GW I have route to 10.10.1.1/24 -> 10.1.1.3 >>>>> >>>>> so everytime when 10.1.1.2 try to contact someone from >>>>> 10.10.1.1/24 I see: >>>>> rtfree: 0xc741ee88 has 1 refs >>>>> >>>>> if I add direct route on 10.1.1.2 to 10.10.1.1/24 through 10.1.1.3 >>>>> the message will go away. >>>>> >>>>> Should I ignore this msg for now, or should I expect kernel panic >>>>> soon? :) >>> >>> Just FYI, I see this on a few boxes including the 7-BETA2 I'm >>> writing this on. None of them has a carp interface though. What I >>> find interesting here is that none of them are able to run a SMP >>> kernel without crashing (no panic, they're just frozen completely). >>> >>> Perhaps it is a coincidence, I don't know, but I am very interested >>> in your findings and have testbeds if you need. >>> >>> --per >> In the begging I thought this is very easy reproducible, but it isn't :) >> In my situation the IP of the default GW sits on carp interface (the >> host have nothing to do with carp) >> and when the host receive icmp redirect messages they actually are >> send from the IP of the netwrok card of the GW (not the IP that sits >> on carp0) >> then the host things that those icmp type 5 are spoofed and just >> ignore them and do not add shorter route. >> In this situation after reboot the hosts start to moan about rtfree, >> so I played with routes and settings, added manually routes and now >> when I restore everything to previous state >> I do not see anymore rtfree warnings. So may be once the route is >> created manually and then removed, wrong call of rtfree is not >> triggered anymore. >> I'll reboot the host latter to see if this easy reproducible at least >> on reboot, and if it is, I'll compile debug kernel and will run >> backtrace. >> >> The other thing that bother me is that icmp redirects are not send >> from the carpIP, but from the real interface's IP? Isn't this a bug, >> or it is normal behavior? >> > -- Best Wishes, Stefan Lambrev ICQ# 24134177
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