Date: Fri, 11 Sep 2009 10:37:56 -0700 From: Pyun YongHyeon <pyunyh@gmail.com> To: Pieter de Goeje <pieter@degoeje.nl> Cc: freebsd-current@freebsd.org Subject: Re: BETA3: network processes hang in keglimit (unkillable) Message-ID: <20090911173756.GA1100@michelle.cdnetworks.com> In-Reply-To: <200909111924.10927.pieter@degoeje.nl> References: <200909111924.10927.pieter@degoeje.nl>
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On Fri, Sep 11, 2009 at 07:24:10PM +0200, Pieter de Goeje wrote: > I just experienced a complete loss of network, where every network related > process would sleep on "keglimit". I was unable to recover from this > situation. I tried killing the processes with SIGKILL, but it didn't work, > and I tried to bring the network interface (em) down and up again, which also > didn't work. A reboot "solved" the problem. The machine was handling some > major traffic, both TCP and UDP. > > Apparently the system was waiting on some resource to free up, but what could > it be? How can this situation be avoided in the future? > > uname: 8.0-BETA3 FreeBSD 8.0-BETA3 #1: Sun Aug 30 01:23:36 CEST 2009 amd64 > Both em(4) and igb(4) had mbuf leak bug which was recently fixed by Jack. Check mbuf statistics with "netstat -m" and see whether you've reached mbuf resource limit(see 4K jumbo cluster counter). The leak can be easily seen on UDP traffic, especially NFS over UDP.
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