@Colin this was indeed fixed by the backport of
4ecd55ea074217473f94cfee21bb72864d39f8d7, as we suspected it would be. I
think this can be closed.
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We are going to set a system with a 4.15.0-60 kernel from the -proposed
repository to confirm that this fixes the issue. Colin, do you know when
that kernel will make its way out of -proposed and become generally
available?
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It looks like items are in rare cases being removed from the export
cache's hash table without being removed from the queue. Once they are
removed from the hash table, no downcall can complete the request,
because the item can't be looked up in the hash table, leaving the item
orphaned, along with
We used BPF/BCC to trace all refcount changes on all of the relevant
mounts, and for each (struct mount*, stack) pair, kept track of the
number of references acquired/released by that pair. Including the
struct mount* in the key in our map make the map quite large, but
allowed us to pare the output
We are still seeing this issue and still working on tracking it down.
We've done some tracing to track all of the refcount changes by stack
when this occurs. However, the refcount is manipulated from many
different contexts, making it difficult to identify which increment is
the odd one out.
We ar
Thanks for taking a look. One of the things that is painful about
debugging this issue is how long it takes to manifest. It would probably
require several weeks of testing a particular kernel version without
seeing the issue before we could be reasonably sure that the problem is
fixed. Also, testin
Public bug reported:
We periodically see an issue where unmounting a ZFS filesystem fails
with EBUSY, even though there appears to be no one using it.
# cat /proc/self/mounts | grep
/domain0/group-38/oracle_db_container-202/oracle_timeflow-16370/archive
domain0/group-38/oracle_db_contain
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