System frequently locks up in io_schedule.

Issue

• System frequently locks up in io_schedule:

PID: 19404  TASK: ffff8101ff6540c0  CPU: 2   COMMAND: "ologgerd"
 #0 [ffff8101ea105b08] schedule at ffffffff80062f96
 #1 [ffff8101ea105be0] io_schedule at ffffffff800637ea
 #2 [ffff8101ea105c00] sync_page at ffffffff80028912
 #3 [ffff8101ea105c10] __wait_on_bit_lock at ffffffff8006392e
 #4 [ffff8101ea105c40] __lock_page at ffffffff8003fc8b
 #5 [ffff8101ea105c90] do_generic_mapping_read at ffffffff8000c2a2
 #6 [ffff8101ea105d70] __generic_file_aio_read at ffffffff8000c563
 #7 [ffff8101ea105de0] generic_file_aio_read at ffffffff80016c91
 #8 [ffff8101ea105e00] do_sync_read at ffffffff8000cddf
 #9 [ffff8101ea105f10] vfs_read at ffffffff8000b695
#10 [ffff8101ea105f40] sys_pread64 at ffffffff800134e3
#11 [ffff8101ea105f80] tracesys at ffffffff8005d28d (via system_call)
    RIP: 0000003d3320e258  RSP: 00000000407ff170  RFLAGS: 00000202
    RAX: ffffffffffffffda  RBX: ffffffff8005d28d  RCX: ffffffffffffffff
    RDX: 0000000000001000  RSI: 00002aaab41b0bf8  RDI: 0000000000000012
    RBP: 00002aaab000dbd0   R8: 0000000000001000   R9: 0000000000000000
    R10: 00000000000d2000  R11: 0000000000000202  R12: 00002aaab000c9e0
    R13: 0000000000001000  R14: 00000000000d2000  R15: 000000012fd749c0
    ORIG_RAX: 0000000000000011  CS: 0033  SS: 002b