Date: Sun, 9 Apr 2000 19:17:03 -0700 From: Alfred Perlstein <bright@wintelcom.net> To: Brian Fundakowski Feldman <green@FreeBSD.ORG> Cc: hackers@FreeBSD.ORG Subject: Re: somewhat random mostly-lockups in 5.0 Message-ID: <20000409191702.P4381@fw.wintelcom.net> In-Reply-To: <Pine.BSF.4.21.0004092049560.71419-100000@green.dyndns.org>; from green@FreeBSD.ORG on Sun, Apr 09, 2000 at 09:03:04PM -0400 References: <Pine.BSF.4.21.0004092049560.71419-100000@green.dyndns.org>
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* Brian Fundakowski Feldman <green@FreeBSD.ORG> [000409 18:30] wrote: > Well, it seems that -CURRENT likes locking up nowdays. It started happening > very recently, and I (as well as jlemon) do suspect that it's a problem > with some of the changes that were made to the syscall mechanisms on > 3/28/2000. > > Keep in mind that this problem is completely corroborated by a friend > whose machine behaved exactly the same starting at the same time. I > hadn't noticed it until now because it seems to occur under rare > circumstances, which are untknown till now. The circumstances sre > trivial things like compiling things and playing mp3's, normally > quite mediocre stuff. > > The syptoms are that the machine locks up. Hard. But there's a catch: > it _can_ be pinged. In fact, TCP connections can be made. In my > case, SSH connected, but the remote end never sent/received any data > (or, that is, showed signs). In my friend's case, telnet connected, > but yet no data was received or acknowledged. According to jlemon, > whose diagnosis makes sense, the problem is that for whatever reason > the kernel is not returning to user mode. That explains why sshd > doesn't work, telnetd doesn't work, XFree86 and apps don't respond. > The question is, why? This can happen when the kernel is stuck in an infinite loop somewhere, you're still responding to interrupts, just stuck somewhere. FYI: ~ % uname -a FreeBSD thumper 5.0-CURRENT FreeBSD 5.0-CURRENT #1: Sun Apr 2 16:29:20 PDT 2000 bright@thumper:/home/src/sys/compile/thumper i386 ~ % uptime 10:58PM up 7 days, 4:06, 21 users, load averages: 0.01, 0.02, 0.00 I've been building world, playing mp3s, using fxtv and xmradio. My setup is fine, perhaps you can furnish us with a traceback? These kinds of lockups are very easy to fix with a traceback because they just mean that most likely the kernel is stuck in an infinite loop somewhere. In otherwords, unplug your palm pilot and attach a console. thanks, -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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