Today I experienced a hanging dom0 and domU. Applications that tried to access
/proc, such as ps, ifconfig, lvdisplay, mdadm all hung after displaying between
one
and ten lines of output. ''free'' worked and didn''t
output anything weird. Apache
was running in domU and also didn''t respond.
This occurred in both dom0 as well as domU. After some time googling and
trying to analyze the situation, we wanted the server back so tried rebooting
domU. This didn''t help so I rebooted dom0 as well but the problem
persisted.
I needed to look at something else and looked at the box a couple of hours
later. The problem now didn''t occur anymore. I could execute all
commands
without hanging.
This log file shows errors from the snmpd daemon. Every 30 secs, a repetition
of the three lines:
Nov 6 09:41:45 alpha snmpd[2203]: netsnmp_assert index == tmp failed
if-mib/data_access/i <<snip>>
Nov 6 09:41:45 alpha snmpd[2203]: netsnmp_assert __extension__ ({ size_t
__s1_len, __s2_l <<snip>>
Nov 6 09:41:45 alpha snmpd[2203]: error on subcontainer
''ia_addr'' insert (-1)
Nov 6 09:41:45 alpha last message repeated 5 times
Funny enough, logs show no gaps.
This is all on a Dell Poweredge 860, running CentOS 5.0, with kernel
version 2.6.18-8.1.6.el5xen.
Any ideas?
Thanks,
Bart
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