Hi, I'm modifying Gem5 (version 22.0.0.1) for a research project and one thing
I'm testing is using special loads which when issued do not search the store
queue for a potential store forward.
I've implemented this with a goto in LSQUnit::read in lsq_unit.cc from right
before the loop that searches the store queue (starting line 1390) to the end
of the loop, where the cache access is implemented (line 1568).
For some reason this change has caused Gem5 to crash fairly often. I'm running
Spec2017 using simpoints and around 40% of generated checkpoints crash with the
following error:
build/ARM/sim/faults.cc:102: panic: panic condition !handled &&
!tc->getSystemPtr()->trapToGdb(SIGSEGV, tc->contextId()) occurred: Page table
fault when accessing virtual address 0x54000000540
This only happens with checkpoints containing my new load instruction opcode,
and not checkpoints without them (which are also otherwise identical).
Furthermore these broken checkpoints run fine again as soon as this goto
statement is removed.
Does anyone have any ideas why this could be happening? I've tried reading
through the store forwarding code and can't figure out why skipping it
altogether could cause any problems.
Thanks.
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