Date: Tue, 04 Aug 2009 16:17:36 +0100 From: Lawrence Stewart <lstewart@freebsd.org> To: Kamigishi Rei <spambox@haruhiism.net> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: [follow-up] FreeBSD/amd64 r195146 to r195848, fatal trap 12 under network load Message-ID: <4A785110.9060705@freebsd.org> In-Reply-To: <4A724BA1.7050303@haruhiism.net> References: <4A6F0A35.7050809@haruhiism.net> <4A724BA1.7050303@haruhiism.net>
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Kamigishi Rei wrote: > Kamigishi Rei wrote: >> Revisions mentioned are those which were tested by me; r195849+ has >> the corruption padded somewhere else so it might produce a panic with >> a different set of options. For reference, my test kernel uses a >> GENERIC config from May 09 snapshot without WITNESS and with >> IPFIREWALL, IPFIREWALL_DEFAULT_TO_ACCEPT and DEVICE_POLLING enabled. > r195981 (latest checkout) traps with the *GENERIC* kernel (with WITNESS > enabled). Same backtrace, same cause, and UP systems are not affected > again. > Apparently, my diagnostics patch from the previous message seems to pad > the corruption somewhere, so I can't use it to check lo_witness or other > fields of nws_mtx at the time when mtx_lock gets corrupted. > > Trap can be triggered with "ping -f -s 65507 localhost", iperf (just > "iperf -c localhost" works for me), or by generating some high-speed > network throughput (even a mysql query over localhost will do as we have > a race here). Running ping will mostly trigger the trap inside > swi_net(); iperf - inside netisr_queue_internal(). > > I will be grateful if someone could provide me some information on how > to further debug it. Currently, I suspect that there's something about > handling modspace (incorrect dereference somewhere, or something like > that). For the benefit of the list, we've finally got this reproduced on a netperf cluster node after much gnashing of teeth. Stay tuned for updates. Cheers, Lawrence
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