Strange issue with cache device

[xyzzyx]

Hi,

i have setup a 7 disk raidz pool with 1 SSD cache device.. "zpool
status" on the pool shows the following

pool: ztank
state: ONLINE
scan: none requested
config:

NAME STATE READ WRITE CKSUM
ztank ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
cztank0 ONLINE 0 0 0
cztank1 ONLINE 0 0 0
cztank2 ONLINE 0 0 0
cztank3 ONLINE 0 0 0
cztank4 ONLINE 0 0 0
cztank5 ONLINE 0 0 0
cztank6 ONLINE 0 0 0
cache
cztankc ONLINE 39.1K 0 0

errors: No known data errors

I seem to get a lot of kernel messages like the following on my cache
device.

[140664.851915] attempt to access beyond end of device
[140664.851925] dm-9: rw=0, want=36028797018894278, limit=97692328

Each device on the pool is encrypted including the cache, hence the
dm-9 on the kernel message. So i am wondering if this is a bug or
normal behavior that zfs is always trying to access beyond the end of
device on the cache..

P.S. i am not getting data corruption but it just keep doing it...

[mgiammarco]

It happens also to me and it is not a cache device. Look at my other
post.