Warning: I2C3 low on stack!

Hi all, i was just performing some pre-flight checks on my quad and I noticed this in the console output:

NuttShell (NSH)
nsh> e[KWARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
INFO  [ecl/EKF] EKF aligned, (pressure height, IMU buf: 22, OBS buf: 14)
WARN  [commander] REJECT POSITION CONTROL
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
INFO  [ecl/EKF] EKF GPS checks passed (WGS-84 origin set)
INFO  [ecl/EKF] EKF commencing GPS fusion
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
WARN  [load_mon] wq:I2C3 low on stack! (292 bytes left)
INFO  [logger] Start file log (type: full)
INFO  [logger] Opened full log file: /fs/microsd/log/2020-06-25/09_22_12.ulg

You can see how many warnings I got about the I2C3 being low on stack… by what I know, the I2C3 is connected to the IST8310 magnetometer on the Pixhawk 4 I am using… I just want to ask if this is normal or unexpected… Thanks :slight_smile:

Thanks for the question. This is a warning that stack is below the buffer threshold. This basically means that the stack size should be increased a bit to be above the “safe” threshold. Is this on latest master or a release version?

It is on 1.10.1. Today it also happened on I2C1

@dagar should we do patch that for v1.10.1 or is it safe to ignore it?