Question for v1.6.0

I flashed the v1.6.0 firmeware,then the message “WARN [load_mon] px4io low on stack! (292 bytes left)” always displayed at system console,is it a question?when I run “camera_trigger test” command at system console,it display "nsh> WARN [uorb] orb_publish failed"message.the “ver all” command returns messgae below:

nsh> ver all
HW arch: PX4FMU_V2
FW git-hash: 981dac8e955b3a4194421605dda7a09b7c16bbc5
FW version: 1.6.0 0 (17170432)
OS: NuttX
OS version: Release 7.10.0 (118489343)
OS git-hash: 8b81cf5c7ece0c228eaaea3e9d8e667fc4d21a06
Build datetime: May 6 2017 10:52:09
Build uri: localhost
Toolchain: GNU GCC, 5.4.1 20160919 (release) [ARM/embedded-5-branch revision 240496]
MFGUID: 313236343435511600380027
MCU: STM32F42x, rev. 3
UID: 380027:34355116:31323634

I reboot the system and the “WARN [load_mon] px4io low on stack! (292 bytes left)” message disappered,but anybody tested the camera_trigger driver successed?
nsh> camera_trigger status
INFO [camera_trigger] state : disabled
INFO [camera_trigger] mode : 1
INFO [camera_trigger] interval : 1000.00 [ms]
INFO [camera_trigger] distance : 25.00 [m]
INFO [camera_trigger] activation time : 100.00 [ms]
INFO [camera_trigger] PWM trigger mode (Seagull MAP2) , pins enabled : [-1][-1][-1][-1][4][5]
nsh> camera_trigger test
nsWARN [uorb] orb_publish failed

There is a fix for this incoming. I broke it recently.

Fixed here :

Thanks very much,I’ll test it when it be purged into master.