Dear all,
I am confused with the following error: Fatal: (SIGSEGV) Bad handle or reference.
This error directs me to the line where I define the coverpoint.
covergroup reset_coverage (ref reset_seq_item item);
rst_cp: coverpoint item.rstn { // error seems to be here
endgroup : reset_coverage
Any help will be appreciated.
Thank you.
dave_59
February 16, 2015, 9:50pm
2
This looks like a run time error - there should be more information in the error message, like a call stack trace. Most likely you failed to construct the covergroup before calling sample().
In reply to dave_59 :
Hello Dave,
the stack trace says:
HDL call sequence:
This is exactly where I defined the coverpoint. Coming to the contructor of the covergroup, I see, I did it in the coverage class.
class coverage extends uvm_subscriber #(item);
item item_inst;
function new (string name, uvm_component p);
function void write (input item t);
endclass
Any suggestions please?
dave_59
February 17, 2015, 4:45pm
4
In reply to vkantamn :
There should be more information that that one line of error message you showed. There is normally information about the process that the segfault was executing on.
If you can runt interactively, use the tb command after the simulation halts.
In reply to dave_59 :
Dave,
thank you very much for your follow-up and inevitable support. I sincerely appreciate this. I am adding entire log for your reference.
@filter_001_seq . [filter_001_seq] GP_FILT_VAL_I SET@filter_001_seq …f_sequence_001 [FILT_SEQUENCER_IF_001_seq] Starting to generate traffic …@1260 @filter_001_seq …f_sequence_001 [FILT_SEQUENCER_IF_001_seq] Traffic sequences have completed.@filter_001_seq . [filter_001_seq] RESET SET INACTIVE@filter_001_seq . [filter_001_seq] RD_FILT RAISED HIGH@filter_001_seq …r_sequence_001 [RESET_IF_001_seq] Starting to generate traffic …@filter_001_seq …f_sequence_001 [FILT_SEQUENCER_IF_001_seq] Starting to generate traffic …@1758 #FORK #74_f61cbb6 File: ./FILTER_VERIFY_tb/sv/reset_IF/sv//RESET_IF_coverage.svhThe error pops up only when the following line of the code is uncommented: cov_group.sample();
The error closely points to driver where the drive task is defined:
task drive(REQ req, RSP rsp);
`uvm_info("DEBUG", {"\n", req.sprint()}, UVM_FULL);
`uvm_info("ITEM", {"\n", req.sprint()}, UVM_NONE);
// set signals according to 'req'
// capture any output (including input) in 'rsp'
@(posedge vif.clk_i);
vif.rstn = req.rstn;
endtask: drive
I dont have good understand about req and rsp. Maybe something wrong with driving the signals?
Thank you and Regards,
dave_59
February 18, 2015, 3:26pm
6
In reply to vkantamn :
That stack trace starts where it says
You need to look at line 94 of
There is probably a call to ap.write(t) and t is null. This may get very complicated to debug in a forum, I suggest you learn how to interactively debug your code and trace the execution of your code. Try to find someone locally to help you.
BTW, there is no need for the line in your class coverage’s constructor
item_inst = new();
item_inst will be overwritten with another object what write() gets called.