To clarify, "SIGSEGV and null exceptions " happens to the benchmark suite,
not gem5. Gem5 is running without errors. But in the system.pc.com_1.device
files, I observe that most of the benchmarks crash due to SIGSEGV or null
exceptions.
Example:
"
x/system.pc.com_1.device
buffers
1 #
2 # A fatal error has been detected by the Java Runtime Environment:
3 #
4 # SIGSEGV (0xb) at pc=0x00007f81d17742b7, pid=1474,
tid=0x00007f81cf46d700
5 #
6 # JRE version: Java(TM) SE Runtime Environment (8.0_171-b11) (build
1.8.0_171-b11)
7 # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.171-b11 mixed mode
linux-amd64 compressed oops)
8 # Problematic frame:
9 # J 1815 C2
org.apache.xml.serializer.ToHTMLStream.endElement(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
(389 bytes) @ 0x00007f81d17742b7 [0x00007f81d1774280+0x37]
10 #
11 #
"
On Mon, Jul 16, 2018 at 11:39 AM Da Zhang <[email protected]> wrote:
> Hey guys,
>
> I am testing a java benchmark suite, dacapo, on gem5 with fs mode.
> Unfortunately, I encounter a lot of SIGSEGV and null exceptions during
> timing mode after restarting from the checkpoints.
> I am using linux kernel v4.8.13 and ubuntu-server-16.04.1 with
> oracle jdk v8.0_171-b11. To eliminate the influence of my modifications to
> gem5 src/ and configs/, I re-download gem5 and checkout to commit
> "ee2ffdc0fdb489767768e5273a4ccd7b51735c7c", which is the gem5 version I am
> working on. The checkpoint was taken by using kvm cpu with 1 CPU and 16GB
> memory. For the simulation, I use build/X86/gem5.opt (in order to enable
> assertions) with fs mode (configs/example/fs.py). Other options include
> "--cpu-type=DerivO3CPU -n 1 --mem-size=16GB --caches --l2cache
> --l2_size=${L2SIZE}" (I try L2SIZE from 256KB to 8MB). I test with 100ms
> warmup and 1ps real simulation time. There are no errors presented. But
> with longer real simulation time, the benchmark suite crashes with
> segfault.
> I am able to run the dacapo benchmark suite in fs mode with kvm cpu,
> without any segfaults or exceptions. I have some simple java benchmarks
> tested; neither segfaults nor exceptions present.
> Does anyone have suggestions or experience against these issues?
>
> best,
> Da Zhang
>
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