Hello!
Last night I was trying to get KDE5 to start up on my new machine, and a
couple of KDE's processes kept crashing, dumping cores like the one below:
-rw------- 1 mi wheel 45780992 Jul 23 22:28 ksplashqml.core
After, maybe, 10 such rounds -- each generating two core-dump -- ZFS
hung... The machine was otherwise responsive, but any attempts to access
the ZFS filesystems would hang as NFS would, when the remote server
stops responding...
Pressing Ctrl-T would show the process in the state named "zfs".
According to "systat -vm", all four disks involved in the raidz1 were
writing in excess of 100MB/s, so I let it be for a few minutes, but
nothing improved -- and the writes continued...
I pressed Ctrl-Alt-Del, which initiated a shutdown, but the shutdown
hung as well ("some processes would not die") and I had to do a power
cycle...
The sole zpool consists of 4 3TB drives and a 16GB log (on an SSD) thus:
NAME STATE READ WRITE CKSUM
aldan ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
da0 ONLINE 0 0 0
ada1 ONLINE 0 0 0
da2 ONLINE 0 0 0
da1 ONLINE 0 0 0
logs
ada0e ONLINE 0 0 0
It reports no data-errors after reboot. There are multiple filesystems
on it, among them /home. The box is running a very recent
FreeBSD-11/amd64 (r336626). It has 4 Xeon cores and 128GB of RAM. The
pool was created under FreeBSD-10 -- after this incident I upgraded it.
What happened? Thanks! Yours,
-mi
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