[Xenomai-help] RTDM task blocks when connecting gdb to realtime task

["Herrera-Bendezu, Luis" <lherrera@domain.hid>]

Hello:

I am using Xenomai 2.4.10 on PPC. An RTDM driver creates an RTDM task
using rtdm_task_init() and goes to sleep periodically via function
rtdm_task_sleep().

When driver is loaded, RTDM task executes as expected. Then a realtime
application is started via gdbserver on target board and on a linux host
a gdb client is connected to that board. As soon as gdb breakpoints the
realtime application the RTDM task never returns from rtdm_task_sleep().
The application does not open the RTMD driver so at this point there is
no interaction with the driver.

The RTDM task is intr_sim and the timer is no longer firing
# cat /proc/xenomai/timerstat/master
CPU  SCHEDULED   FIRED       TIMEOUT    INTERVAL   HANDLER      NAME
0    29198042    9132085     3724750    -          NULL
[host-timer]
0    1340        1340        -          -          xnthread_ti  intr_sim

The realtime application is ancvbirt.
# cat /proc/xenomai/sched
CPU  PID    PRI      PERIOD     TIMEOUT    TIMEBASE  STAT       NAME
  0  0       -1      0          0          master    R          ROOT
  0  0       90      0          0          master    D          intr_sim
  0  1869     0      0          0          master    XT         ancvbirt

Any ideas on the cause of the problem and fix?

Thanks,
Luis G. Herrera-Bendezu