Date: Wed, 27 Apr 2005 21:53:04 +0200 (CEST) From: Sten Spans <sten@blinkenlights.nl> To: Andrew Belashov <bel@orel.ru> Cc: freebsd-sparc64@FreeBSD.org Subject: Re: sparc64/80410: netgraph is causing crash with mpd on sparc64 Message-ID: <Pine.SOC.4.61.0504272139440.22696@tea.blinkenlights.nl> In-Reply-To: <200504271552.j3RFqCgv077122@white.orel.ru> References: <200504271552.j3RFqCgv077122@white.orel.ru>
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On Wed, 27 Apr 2005, Andrew Belashov wrote: > >> Description: > mpd does not work on FreeBSD/sparc64. Kernel panic with "memory address > not aligned" trap message. > >> How-To-Repeat: > Configure and run mpd for VPN over pptp. After connect to VPN, > start nmap scanner. Kernel right away crashed. I have coredump: > Finding unaligned ( or rather not 64bit aligned ) mbufs is the new cool thing, try if_em or if_tap for more fun and games :). On a more serious note, the main problem is that l3 protocols ( ip, ipv6, ipx ) expect their data to be aligned a certain way. But newer ethernet cards, complex headers, complex tunneling tricks, etc often shift contents a few bytes. i386 has no alignment constraints ( a small speed hit though ) which means that these problems are often overlooked. OpenBSD and NetBSD have quite a few dirty hacks in drivers to fixup the mess for each driver. Some work has been done with m_copyup in -CURRENT but the debate is still open on wether this should be fixed in a general way in l3 protocols, or in each "ethernet" driver, or even somewhere else entirely. HTH HAND -- Sten Spans "There is a crack in everything, that's how the light gets in." Leonard Cohen - Anthem
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