reboot after select api

kyk

Hi,
I am using select call in my application to monitor a sysfs entry.
The sysfs entry will be toggled at a rate of 1000 samples per second.
I added the file descriptor in exceptfds list.
When I used select call with timeout parameter as NULL. After few seconds the system hanged and reboot occured.
When I used select call with timeout as 1 minute I didnt face any issue.
Can anyone please provide the reason?