Debugging sporadic read errors from Mesa 7i95

$ ~/build/linuxcnc-dev/scripts/rip-environment halcmd show all *.tmax
Loaded HAL Components:
ID      Type  Name                                            PID   State

Component Pins:
Owner   Type  Dir         Value  Name

Pin Aliases:
 Alias                                            Original Name

Signals:
Type          Value  Name     (linked to)

Parameters:
Owner   Type  Dir         Value  Name
    57  s32   RW          23940  comp_x.tmax
    57  s32   RW          21528  comp_y.tmax
    57  s32   RW          23364  comp_z.tmax
    23  s32   RW          25236  ddt_x.tmax
    23  s32   RW          21852  ddt_xv.tmax
    23  s32   RW          28818  ddt_y.tmax
    23  s32   RW          23076  ddt_yv.tmax
    23  s32   RW          24354  ddt_z.tmax
    23  s32   RW          26928  ddt_zv.tmax
    65  s32   RW              0  hm2_7i95.0.read-request.tmax
    65  s32   RW        1216764  hm2_7i95.0.read.tmax
    65  s32   RW         170118  hm2_7i95.0.write.tmax
    34  s32   RW          36342  limit_speed.tmax
    19  s32   RW          26946  motion-command-handler.tmax
    19  s32   RW         160434  motion-controller.tmax
    40  s32   RW          23040  near_speed.tmax
    54  s32   RW          24426  or2_0.tmax
    43  s32   RW          25740  rpm_rps.tmax
    20  s32   RW        1265814  servo-thread.tmax
    31  s32   RW          34200  sim_spindle.tmax
    37  s32   RW          27306  spindle_mass.tmax
    26  s32   RW          48546  vel_xy.tmax
    26  s32   RW          24624  vel_xyz.tmax

Parameter Aliases:
 Alias                                            Original Name

Exported Functions:
Owner   CodeAddr  Arg       FP   Users  Name

Realtime Threads:
     Period  FP     Name               (     Time, Max-Time )