AMY seems to leak heap memory when started and stopped repeatedly. #554
Description
Issue summary
After being repeatedly started and stopped, AMY seems to leak heap memory. When compiled with -O3 for the nRF52840, it leaks about 520 bytes on the first iteration and 508 bytes every iteration thereafter. Eventually, this leads to a complete exhaustion of heap memory on the system.
Iteration count : 1
Heap leaked : 540
...
Iteration count : 2
Heap leaked : 508
...
Iteration count : 3
Heap leaked : 508
Duplicating the issue
This issue can be duplicated using the same sample sketch detailed in issue #553
Full Serial output from tests
$ make monitor
Monitor using port: /dev/cu.usbmodem2101
Using default monitor configuration for board: shorepine:nrf52:xiaonRF52840Plus
Monitor port settings:
baudrate=9600
bits=8
dtr=on
parity=none
rts=on
stop_bits=1
Connecting to /dev/cu.usbmodem2101. Press CTRL-C to exit.
Board ID : 0x817CCCA36A473E6C1D675EEAEF788915
T - Loop
______________________________________________
| Name | Addr 0x2000xxxx | Usage |
| ---------------------------------------------|
| Stack| 0xF800 - 0xFFFF | 688 / 2048 (33%) |
| Heap | 0xA388 - 0xF7FF | 17236 / 218232 (07%) |
| Bss | 0x6000 - 0xA387 | 17288 |
| SD | 0x0000 - 0x5FFF | 24576 |
|______________________________________________|
Task State Prio StackLeft Num
-----------------------------------
loop X 1 593 1
IDLE R 0 25 3
Callbac B 2 729 2
BLE B 3 1195 6
SOC B 3 163 7
usbd B 3 132 5
Tmr Svc B 2 218 4
Iteration count : 1
No sequencer support for this chip / platform
Iteration count : 1
Underrun count : 1
I2S write count : 489
I2S write bytes : 500736
I2S write zeros : 0
Amy task count : 489
Amy update ema : 2893
Amy update max : 4883
Event setup : 7812
Amy sysclock : 4022
Amy sample rate : 31250
Heap used : 66396
No sequencer support for this chip / platform
Heap leaked : 540
Heap free : 200456
WARNING Underrun: 1
T - Loop
______________________________________________
| Name | Addr 0x2000xxxx | Usage |
| ---------------------------------------------|
| Stack| 0xF800 - 0xFFFF | 688 / 2048 (33%) |
| Heap | 0xA388 - 0xF7FF | 17776 / 218232 (08%) |
| Bss | 0x6000 - 0xA387 | 17288 |
| SD | 0x0000 - 0x5FFF | 24576 |
|______________________________________________|
Task State Prio StackLeft Num
-----------------------------------
loop X 1 286 1
IDLE R 0 25 3
BLE B 3 1195 6
SOC B 3 163 7
usbd B 3 132 5
Tmr Svc B 2 218 4
Callbac B 2 729 2
Iteration count : 2
No sequencer support for this chip / platform
Iteration count : 2
Underrun count : 1
I2S write count : 489
I2S write bytes : 500736
I2S write zeros : 0
Amy task count : 489
Amy update ema : 2892
Amy update max : 4883
Event setup : 7813
Amy sysclock : 4022
Amy sample rate : 31250
Heap used : 66364
No sequencer support for this chip / platform
Heap leaked : 508
Heap free : 199948
WARNING Underrun: 1
T - Loop
______________________________________________
| Name | Addr 0x2000xxxx | Usage |
| ---------------------------------------------|
| Stack| 0xF800 - 0xFFFF | 688 / 2048 (33%) |
| Heap | 0xA388 - 0xF7FF | 18284 / 218232 (08%) |
| Bss | 0x6000 - 0xA387 | 17288 |
| SD | 0x0000 - 0x5FFF | 24576 |
|______________________________________________|
Task State Prio StackLeft Num
-----------------------------------
loop X 1 286 1
IDLE R 0 25 3
SOC B 3 163 7
Tmr Svc B 2 218 4
usbd B 3 132 5
Callbac B 2 729 2
BLE B 3 1195 6
Iteration count : 3
No sequencer support for this chip / platform
Iteration count : 3
Underrun count : 1
I2S write count : 489
I2S write bytes : 500736
I2S write zeros : 0
Amy task count : 489
Amy update ema : 2892
Amy update max : 4883
Event setup : 7812
Amy sysclock : 4022
Amy sample rate : 31250
Heap used : 66364
No sequencer support for this chip / platform
Heap leaked : 508
Heap free : 199440
WARNING Underrun: 1