Freed UMA keg Lost pages of memory

[George Kola]

We are running FreeBSD 10.1 and we had 4 1 TB SSDs in L2ARC which we removed and made into a separate zpool. 
I ran sysctl and noticed a strange message showing this lost memory.
I have pasted output of sysctl -a |grep UMA. Any idea why this is happening ? Any fixes or suggested solution ?

hosts (1/10): sjc1-prod1-01.voxer.com
Freed UMA keg (zio_data_buf_1024) was not empty (333 items).  Lost 171 pages of memory.
Freed UMA keg (zio_data_buf_1536) was not empty (138 items).  Lost 583 pages of memory.
Freed UMA keg (zio_data_buf_2048) was not empty (84 items).  Lost 148 pages of memory.
Freed UMA keg (zio_data_buf_1024) was not empty (380 items).  Lost 175 pages of memory.
Freed UMA keg (zio_data_buf_1536) was not empty (154 items).  Lost 328 pages of memory.
Freed UMA keg (zio_data_buf_2048) was not empty (67 items).  Lost 91 pages of memory.
Freed UMA keg (zio_data_buf_1024) was not empty (256 items).  Lost 95 pages of memory.
Freed UMA keg (zio_data_buf_1536) was not empty (170 items).  Lost 383 pages of memory.
Freed UMA keg (zio_data_buf_2048) was not empty (117 items).  Lost 257 pages of memory.

hosts (1/10): sjc1-prod1-02.voxer.com
Freed UMA keg (zio_data_buf_1024) was not empty (336 items).  Lost 175 pages of memory.
Freed UMA keg (zio_data_buf_1536) was not empty (157 items).  Lost 638 pages of memory.
Freed UMA keg (zio_data_buf_2048) was not empty (83 items).  Lost 150 pages of memory.
Freed UMA keg (zio_data_buf_1024) was not empty (329 items).  Lost 140 pages of memory.
Freed UMA keg (zio_data_buf_1536) was not empty (216 items).  Lost 425 pages of memory.
Freed UMA keg (zio_data_buf_2048) was not empty (85 items).  Lost 130 pages of memory.
Freed UMA keg (zio_data_buf_1024) was not empty (437 items).  Lost 173 pages of memory.
Freed UMA keg (zio_data_buf_1536) was not empty (165 items).  Lost 576 pages of memory.
Freed UMA keg (zio_data_buf_2048) was not empty (103 items).  Lost 273 pages of memory.


Thanks,
George