Date: Sun, 1 Feb 2004 14:29:32 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Joe Schmoe <non_secure@yahoo.com> Cc: freebsd-hackers@freebsd.org Subject: Re: What kind of a crash is this ? (kernel ? userland ?) Message-ID: <20040201202932.GA25030@dan.emsphone.com> In-Reply-To: <20040201020256.17498.qmail@web21501.mail.yahoo.com> References: <20040201020256.17498.qmail@web21501.mail.yahoo.com>
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In the last episode (Jan 31), Joe Schmoe said: > I have become familiar with certain FreeBSD crashes - namely, I can > tell the difference between the kernel crashing, and the userland > crashing. > > If the machine is down, but I can still ping it, then the userland > has crashed - the kernel is still running, which is why it responds > to pings. "userland" doesn't crash (except maybe if you break libc.so). Rather, one binary most likely is not running. You may be able to telnet in if ssh is not running, for example. > But if it crashes and just reboots itself, then the kernel has > crashed. Oversimplified I know, but I am leading up to: > > What kind of a crash is it if: > > I can ssh to the system, it gives me the BSD copyright and the uname > message, but never ever gives me a prompt. What is going on in this > scenario ? What kind of things have you seen that cause a crash like > this ? Hit ^T and find out what command on the remote side is currently running, and what it's waiting on. Could be DNS, a remote NFS server not responding, local disk problems, etc. -- Dan Nelson dnelson@allantgroup.com
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