Date: Mon, 2 May 2005 22:43:30 -0700 (PDT) From: Doug White <dwhite@gumbysoft.com> To: freebsd-stable@freebsd.org Cc: re@freebsd.org Subject: Experimental ttwwakeup() panic patch Message-ID: <20050502222223.P19845@carver.gumbysoft.com>
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Hey folks, I've taken a crack at working around the ttwwakeup() panic thats been reported now and again. My early analysis, based on debugging output from rwatson, is that a defunct struct tty gets reused without cleaning out the associated (stale) knote structures, and the ttwwakeup() at the end of sioopen() jumps off into space when it finds them. This patch is against RELENG_5 but the logic should apply to -CURRENT, although the patch likely won't as ttymalloc() is organized differently there. I did some basic testing on my UP box and didn't see any abberant behavior afterwards. However I can't reproduce the panic in question, so if you're good at triggering the panic give this a spin. http://people.freebsd.org/~dwhite/tty.c.20050502.patch -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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