Is this an error core dump ?

Soft WDT reset

>>>stack>>>

ctx: cont
sp: 3ffffd70 end: 3fffffc0 offset: 01b0
3fffff20:  3ffe867c 00000000 203d206e 402036c5  
3fffff30:  3ffe8679 000000c8 3ffee379 3ffee35c  
3fffff40:  40201920 3ffee49c 3ffe8689 3ffee35c  
3fffff50:  40201920 3ffee49c 3ffe8671 4020192c  
3fffff60:  40201920 3ffee49c 3ffe8671 40201b29  
3fffff70:  000000c9 3ffee49c 3ffee358 40201b40  
3fffff80:  000000c8 3ffee49c 3ffee358 402010ec  
3fffff90:  3fffdad0 00000000 3ffee35c 3ffee504  
3fffffa0:  3fffdad0 00000000 3ffee4c4 402022d4  
3fffffb0:  feefeffe feefeffe 3ffe84ec 40100e2d  
<<<stack<<<
(⸮⸮P⸮>⸮⸮⸮8 channel Servo test!

it looks like what I have seen in the past.
I am testing a sketch associated with a Adafruit PCA9685 16-Channel Servo Driver.
The sketch is this example:

File->Examples->Adafruit_PWMServoDriver->Servo.

From this web page :16-channel-pwm-servo-driver

Yes - it is a core dump because a watchdog reset is detected.
Is your processor type compatible with the Adafruit library?

Now I am not sure how to track down this bug.
The board is a Adafruit Huzzah Feather, same example sketch.
The thing gets further during execution but seems to throw up when the pulseln goes above 200. it then resets and starts all over again. The prints of the statements of "I am here 2,3 " are comments I put in to be able to follow the flow.
Do I need to post this to an Adafruit forum or do they read here ?
Thanks

The is the output as it executes at the beginning

⸮!⸮L⸮<1⸮1⸮⸮8 channel Servo test!
I am here 2
0
SERVOMIN = 150
SERVOMAX = 600
pulselen = 150
I am here 3
SERVOMIN = 150
SERVOMAX = 600
pulselen = 151

and this is the output as it approaches pulseln=200, goes beyond, does an error dump, and starts over again.

I am here 3
SERVOMIN = 150
SERVOMAX = 600
pulselen = 200
I am here 3
SERVOMIN = 150
SERVOMAX = 600
pulselen
Soft WDT reset

>>>stack>>>

ctx: cont
sp: 3ffffd70 end: 3fffffc0 offset: 01b0
3fffff20:  3ffe867c 00000000 203d206e 40203721  
3fffff30:  3ffe867a 000000c8 3ffee379 3ffee35c  
3fffff40:  40201920 3ffee49c 3ffe8689 3ffee35c  
3fffff50:  40201920 3ffee49c 3ffe8671 4020192c  
3fffff60:  40201920 3ffee49c 3ffe8671 40201b29  
3fffff70:  000000c9 3ffee49c 3ffee358 40201b40  
3fffff80:  000000c8 3ffee49c 3ffee358 402010ec  
3fffff90:  3fffdad0 00000000 3ffee35c 3ffee504  
3fffffa0:  3fffdad0 00000000 3ffee4c4 402022d4  
3fffffb0:  feefeffe feefeffe 3ffe84ec 40100e99  
<<<stack<<<
⸮!⸮L⸮<1⸮1⸮⸮8 channel Servo test!
I am here 2
0
SERVOMIN = 150
SERVOMAX = 600
pulselen = 150

It's not a core dump, it's a stack trace:

Pieter