On 10/8/18 12:54 PM, valdis.kletnieks@vt.edu wrote:

[  680.692915] RIP: 0010:__get_request+0x31/0x7e0

Can you provide the source code line number that corresponds to that 
address? If you haven't done this before: enter gdb 
${path_to_kernel_source_tree}/vmlinux in a shell and then run "list 
*(__get_request+0x31)" (without the double quotes).

Additionally, which block driver is being used in your setup under the 
ext4 filesystem?

Thanks,

Bart.