Re: Commands failing silently?

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mouss wrote:
Dan Bongert wrote:
mouss wrote:
Dan Bongert wrote:
Hello all:

I have a couple CentOS 4 servers (all up-to-date) that are having strange command failures. I first noticed this with a perl script that uses lots of system calls.

thoth(66) /tmp> uname -a
Linux thoth.ssc.wisc.edu 2.6.9-67.0.7.ELsmp #1 SMP Sat Mar 15 06:54:55 EDT 2008 i686 i686 i386 GNU/Linux

Nothing in either dmesg or /var/log/messages seems to indicate any problems. It also doesn't seem to matter what the command is -- ls is the quickest test, but sshd will sometimes to fail to spawn children, etc. There aren't a large amount of processes on the machine either -- only 122 at the moment.

Has anyone seen this behavior before? Have I been hit with some sort of cunning rootkit? This machine shouldn't be publicly accessible; it's behind our firewall.

where is /tmp mounted? is this an external disk (usb, ...)? is it an nfs mount?

It's a local disk:

thoth(97) /tmp> df -h .
Filesystem            Size  Used Avail Use% Mounted on
/dev/md4               16G   77M   15G   1% /tmp

Though 'ls' was just an example -- just about any program will fail. The 'w'
command will fail too:


maybe check your PATH. try
$ /bin/ls

Ok, here's a heck of a thing. When I run 'ls' using the full path (and also when I unalias it -- I have 'ls' aliased to 'ls -F --color'), 'ls' no longer fails.

However, my other test case, 'w', still fails.

(and these are all test cases because I noticed a nightly job with a lot of system() calls was failing).


--
Dan Bongert                     dbongert@xxxxxxxx

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