Date: Fri, 28 Dec 2007 21:39:31 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Michael Butler <imb@protected-networks.net> Cc: FreeBSD current <freebsd-current@freebsd.org>, Jens Schweikhardt <schweikh@schweikhardt.net> Subject: Re: Garbled shutdown message Message-ID: <47755F03.3030909@FreeBSD.org> In-Reply-To: <47754D37.4050702@protected-networks.net> References: <20071228120152.GB1544@schweikhardt.net> <4774F09A.3050405@FreeBSD.org> <47754D37.4050702@protected-networks.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Michael Butler wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Kris Kennaway wrote: >> Jens Schweikhardt wrote: >>> If you look at this closely you can find "Syncing (max 60 seconds) for >>> system process" if you read about every other character. It's always the >>> third of the three "Waiting" lines. Anyone else seeing this? >> You have an SMP system and do not have the PRINTF_BUFR option or >> whatever it is. Without it multiple CPUs have no synchronization >> between printfs and will interleave. > > So the recommended value for PRINTF_BUFR_SIZE is ... ? NOTES has 128 I think. > In my (very brief) browse through kern/subr_prf.c, I didn't see any > overflow protection on the stack-allocated buffer ... which makes me > rather nervous. > > Interleaved text is *way* better than clobbered kernel stack .. So either fix it if there is a problem or don't use it if you are scared :) Kris
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?47755F03.3030909>