Red Hat Bugzilla – Bug 143803
ip_conntrack_amanda module causes amanda hangs
Last modified: 2015-01-04 17:14:32 EST
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Description of problem:
I'm refiling Bug 142745, as I've seen more evidence that this is a
kernel issue rather than an Amanda issue.
amcheck works fine, but amdump hangs forever. Disk archive files are
zero-length, and amanda-related processes have consumed zero time
after 15 hours.
I believe the problem started with a recent kernel upgrade in FC2, but
I have upgraded the server to FC3 and the problem persists. The
amanda configuration has not changed. There is plenty of space on my
holding disk filesystem.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Set up remote backup with amanda. chkconfig amanada on. Open
firewall ports for all amanda processes. Include
"ip_conntrack_amanda" iptables module.
2. Run amcheck.
3. Run amdump.
Actual Results: amcheck works perfectly. amdump starts but hangs
Expected Results: amcheck works perfectly. amdump copies files
across the network to disk holding area (and eventually dumps to tape).
This message at the Amanda FAQ-O-Matic appears to address this issue:
I'm going to set the severity high, as I have no functioning backup
systems so loss of data is a serious risk. If this is an abuse of the
severity rating, please feel free to set it back down.
I can confirm this for at least 2 boxes, one with Fedora Core 2 (2.6.9-1.6_FC2) and one
with Fedora Core 3 (2.6.9-1.681_FC3) kernel.
Problem is caused, if "ip_conntrack_amanda" is loaded on client side (the box which
should be backup), regardless rules in iptables.
I may report that using kernel 2.6.10-1.737_FC3 on FC3 and
kernel-2.6.10-1.8_FC2 on FC2 this issue is fixed.