Date: Sat, 29 May 1999 16:20:16 -0500 (EST) From: "John S. Dyson" <dyson@iquest.net> To: dillon@apollo.backplane.com (Matthew Dillon) Cc: hackers@FreeBSD.ORG Subject: Re: Possible race in pipe device driver, esp on multi-cpu machines. Message-ID: <199905292120.QAA84464@y.dyson.net> In-Reply-To: <199905290846.BAA29926@apollo.backplane.com> from Matthew Dillon at "May 29, 99 01:46:44 am"
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Matthew Dillon said: > > We are attempting to reproduce the problem with a smaller dataset, but > if anyone is hot on the pipe code in the kernel and can give it a once-over > we may be able to find the bug more quickly. > After a quick code inspection (and I really don't remember the details much anymore), it seems that there is a possibility for parts of the state of a pipe to be grabbed before certain locking operations (e.g. pipelock), and that state might change. This could be worse in a multi-writer or multi-reader situation. Just a hint. -- John | Never try to teach a pig to sing, dyson@iquest.net | it makes one look stupid jdyson@nc.com | and it irritates the pig. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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