Some zfs related processes stuck in D state, almost zero disk IO. Some VMs that use zvols as storage had frozen (unable to access the storage), some seemed to work, but I did not check it thoroughly, just reset the whole server.
There were no qemu processes stuck in D state, just the zfs related ones.
The server worked fine for a couple of months before this happened. After reset it appears to work fine.
This happened at random. There are a bunch of VMs running that use zvols as storage.
There are also snapshots used, the backup script does zfs snapshot newsnap, zfs send -i oldsnap newsnap; zfs destroy oldsnap and some zfs list commands.
Include any warning/errors/backtraces from the system logs
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System information
Describe the problem you're observing
Some zfs related processes stuck in D state, almost zero disk IO. Some VMs that use zvols as storage had frozen (unable to access the storage), some seemed to work, but I did not check it thoroughly, just reset the whole server. There were no qemu processes stuck in D state, just the zfs related ones. The server worked fine for a couple of months before this happened. After reset it appears to work fine.
Describe how to reproduce the problem
This happened at random. There are a bunch of VMs running that use zvols as storage.
There are also snapshots used, the backup script does zfs snapshot newsnap, zfs send -i oldsnap newsnap; zfs destroy oldsnap and some zfs list commands.
Include any warning/errors/backtraces from the system logs