While running some port builds over an NFS-mounted /usr/ports on my
aarch64 VM after r321253, I've noticed that sooner or later I'm getting
an error saying "kernel: [zone: mbuf_cluster] kern.ipc.nmbclusters limit
reached". I've tried increasing the sysctl, but after some time I always
got the error.
I've checked the mbuf counter with ``netstat -m'' periodically during
the build, and noticed that the mbufs in use and mbuf clusters in use
are continuously increasing, I've never seen a decrease:
279943/392/280335 mbufs in use (current/cache/total)
130819/253/131072/131072 mbuf clusters in use (current/cache/total/max)
previous commit to HEAD was r321248. I've checked it on that build as
well, and I couldn't reproduce the issue, mbuf counters were stable.
After getting the kernel error message, the builds got stuck, some
processes become unresponsive, and the only way to I was aware to clear
the mbufs was to reboot the VM.
So far what I know, is building over NFS triggers the leak. However, I
haven't tested it with other network activities, might also do the trick.
Could you please take a look into it?
If any more information is needed, please let me know, I still have my
test VMs at hand, I can do a few tests.
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