The task responsible for requesting a wait_for_grant on sequencer for sequence has been killed, to avoid a deadlock the sequence will be removed from the arbitration queues

UVM
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1

Hi I am using default_sequence method to start seq,
I have a parent sequence inside which I am calling child sequences in fork_join using uvm_do and in child sequences bosy method I am using uvm_create macros.

I have not defined any pre_start/pre_do or any such methods, my 1st sequence is taking 4ms to complete and after that I am getting this error.

I have following suspects pls help me understand the exact issue and resolve this
1.Is uvm_do, uvm_create methods affecting in any way.
2.Is it the deafault_sequence problem
3.We can call sequences parallely in fork_join right or is it like we can call only sequence_item in parallel…?
4.In uvm_cookbook and everywhere they have said like recommended method to start seq is using .start ,Y does default sequence create issues like this deadlock…?

2

hi @dave_59 can you please help me with this, in child seq I have a do while loop in body method, initially I thought its causing deadlock but after removing that while loop also deadlock is coming.

3

Very hard to help you without seeing any code. You could try starting the sequence directly instead of implicitly with the default sequence.