Hi,
I am trying to fast-forward a large workload with X86KvmCPU, but the
constructor falls into a segmentation fault.
I use the commit tagged with "v20.0.0.0"
(b1b8af04439240c532d3530a02773b75b9853f77).
The stack trace looks like:
#0 __pthread_kill (threadid=<optimized out>, signo=signo@entry=11) at
../sysdeps/unix/sysv/linux/pthread_kill.c:56
#1 0x000055c0eab76e92 in raiseFatalSignal (signo=signo@entry=11) at
build/X86/sim/init_signals.cc:105
#2 0x000055c0eab76ee9 in segvHandler (sigtype=<optimized out>) at
build/X86/sim/init_signals.cc:165
#3 <signal handler called>
#4 KvmVM::allocVCPUID (this=0x0) at build/X86/cpu/kvm/vm.cc:560
#5 0x000055c0eb2ed251 in BaseKvmCPU::BaseKvmCPU (this=0x55c0ecf152a0,
params=0x55c0ed604e90) at /usr/include/c++/8/ext/new_allocator.h:86
#6 0x000055c0eb2f86e1 in X86KvmCPU::X86KvmCPU (this=0x55c0ecf152a0,
params=0x55c0ed604e90) at build/X86/cpu/kvm/x86_cpu.cc:523
#7 0x000055c0eb2f8921 in X86KvmCPUParams::create (this=0x55c0ed604e90) at
build/X86/cpu/kvm/x86_cpu.cc:1628
...
The KvmVM::allocVCPUID function has only 1 line (return nextVCPUID++),
and accessing nextVCPUID on gdb returns an error:
(gdb) f 4
#4 KvmVM::allocVCPUID (this=0x0) at build/X86/cpu/kvm/vm.cc:560
560 return nextVCPUID++;
(gdb) p nextVCPUID
Cannot access memory at address 0xc0
Does anyone have experience of hitting / workarounding this issue?
Given that the address of nextVCPUID (0xc0) looks broken (also that "this" is
0x0 there), it guess there is an out-of-bound-related bug.
The smallest config that can reproduce this phenomenon is as follows.
import m5
from m5.objects import *
system = System()
system.cpu = X86KvmCPU()
system.cpu.createThreads()
system.cpu.createInterruptController()
system.clk_domain = SrcClockDomain()
system.clk_domain.clock = '1GHz'
system.clk_domain.voltage_domain = VoltageDomain()
root = Root(full_system = False, system = system)
m5.instantiate()
Best regards,
Soramichi
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