Date: Fri, 23 Jun 2006 13:02:58 +0200 (CEST) From: Martin Blapp <mb@imp.ch> To: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> Cc: Robert Watson <rwatson@freebsd.org>, Patrick Guelat <patg@imp.ch>, "Wojciech A. Koszek" <wkoszek@freebsd.org>, freebsd-stable@freebsd.org Subject: Re: Crash with FreeBSD 6.1 STABLE of today Message-ID: <20060623120536.J14714@godot.imp.ch> In-Reply-To: <1151056731.62769.2.camel@buffy.york.ac.uk> References: <20060621202508.S17514@godot.imp.ch> <20060621193941.Y8526@fledge.watson.org> <20060622205806.GA6542@FreeBSD.czest.pl> <20060622223630.V17514@godot.imp.ch> <1151056731.62769.2.camel@buffy.york.ac.uk>
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Hi, >> (kgdb) p *tp->t_session >> Cannot access memory at address 0x0 >> >> So here the problem is. Why is tp->t_session empty ? Maybe it has been already >> free() earlier and we have some race here ? > > "Race" was exactly my conclusion last time I looked into this. > http://docs.FreeBSD.org/cgi/mid.cgi?20041204110815.E80797 > > Something, somewhere is playing with t_session without locking... > Any idea how we can track this down ? It's a very bad thing to have in 61. And yes, the serial output is going over a serial console. Martin
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