Date: Mon, 10 Jan 2000 08:02:51 +0000 From: Brian Somers <brian@Awfulhak.org> To: "Mr. K." <bsd@inbox.org> Cc: stable@FreeBSD.ORG, brian@hak.lan.Awfulhak.org Subject: Re: process stuck in ttywri Message-ID: <200001100802.IAA00425@hak.lan.Awfulhak.org> In-Reply-To: Message from "Mr. K." <bsd@inbox.org> of "Sat, 08 Jan 2000 10:59:11 EST." <Pine.BSF.3.96.1000108105353.20452A-100000@inbox.org>
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> This is the second time I've seen this on two completely different
> machines (different network, different configuration, different state) so
> I'm wondering if anyone else has run into it. What happens is while I'm
> doing a make, one of the processes will get stuck. If I look at top, I
> will see that one of the processes is stuck in ttywri. I know I have very
> little information so I don't expect any solutions, but I was only
> wondering if maybe someone else has run into this also, or maybe it was
> already fixed? Also, if anyone wants to tell me something specific I
> should look for next time it happens...
>
> FreeBSD [censored].home.com 3.4-STABLE FreeBSD 3.4-STABLE #1: Sun
> Dec 19 04:22:13 GMT 1999
> root@[censored].home.com:/usr/src/sys/compile/HOMER i386
I saw this twice in one day on my back-end box running -current from
December 4. I was (strangely enough) running ppp, and conveniently,
``show physical'' shows the results of an ioctl(TIOCOUTQ). The tty
had (from memory) about 1700 bytes in the output queue. I was still
receiving data but the output queue was jammed and the tty
(correctly) wasn't select()ing for write.
Unfortunately, as this is a TA, I had no CTS light to check, but I
assume CTS was not high and that the modem at the other end was
having problems..... I actually wrote it off to a dodgy TA as I've
never seen the problem since :-/
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk>
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