available free disk space on /usr and crash

[Brooks Davis]

On Thu, Jan 27, 2005 at 12:54:03PM +0100, Aron wrote:
> Hi,
> 
> I am tracking FreeBSD 5.3 stable and somehow got to a state where df 
> reported:
> 
> Filesystem  1K-blocks      Used    Avail Capacity  Mounted on
> /dev/ad0s1a    253678     53606   179778    23%    /
> devfs               1         1        0   100%    /dev
> /dev/ad0s1e    253678        88   233296     0%    /tmp
> /dev/ad0s1f   4261038   3989064   -68908   102%    /usr
> /dev/ad0s1g  13999734  11318544  1561212    88%    /usr/home
> /dev/ad2s1  153844706 133929864  7607266    95%    /usr/srv/disk1
> /dev/ad1s1d 109093546  39760220 60605844    40%    /usr/srv/disk2
> /dev/ad0s1d    253678     53858   179526    23%    /var
> 
> I don't have the slightest idea how this happened, but thought someone 
> should be notified. I didn't really do anything with the /usr partition 
> beside of cvsuping and rebuilding world and the ports from time to time. 
> The freebsd machine is used as a server and runs a vsftpd, samba, 
> apache2 and a subversion server. Deleting a few files brought the free 
> disk space on /usr back to a positive number.

/usr looks perfectly normal if full.  This is just basic UNIX operation.
A certain portion of the disk (set at newfs time) is reserved for use by
the root user (performance may degrade significantly if this space is
used).  Avail and Capacity are computed relative to the non-reserved
space.

> I also managed to lock up FreeBSD (just before I noticed the free disk 
> space problem). I uploaded a larger (well, 31MB) encrypted (via PGP) 
> file to a samba network directory from my WinXP client machine (freebsd 
> runs samba 3.0.10 just for the case it mattered, the samba directory is 
> located on the /usr/home partition). I ran PGP (on my windows machine) 
> and pointed it to the encrypted file located on the network. After 
> having decrypted about 30% of the file FreeBSD kind of locked up, or at 
> least it stopped responding (I couldn't even ping the freeBSD machine 
> anymore). Pressing the power-off button seemed to force FreeBSD shutdown 
> properly, so I guess the computer wasn't as dead as I had thought.

You'll need to read the the FreeBSD Developers Handbook section on
kernel debugging and obtain a crash dump from your machine.

-- Brooks

-- 
Any statement of the form "X is the one, true Y" is FALSE.
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