Date: Fri, 28 Dec 2007 14:23:35 -0500 From: Michael Butler <imb@protected-networks.net> To: Kris Kennaway <kris@FreeBSD.org> Cc: FreeBSD current <freebsd-current@freebsd.org>, Jens Schweikhardt <schweikh@schweikhardt.net> Subject: Re: Garbled shutdown message Message-ID: <47754D37.4050702@protected-networks.net> In-Reply-To: <4774F09A.3050405@FreeBSD.org> References: <20071228120152.GB1544@schweikhardt.net> <4774F09A.3050405@FreeBSD.org>
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-----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 ... ? 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 .. Michael -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD4DBQFHdU02Qv9rrgRC1JIRAmG6AJwMUncMH0mLjRy0FljZPFqNd3xlzgCYhUgu L3yExPV9NREBD3RH1xUFqA== =Zp29 -----END PGP SIGNATURE-----
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