Hi Eliot,
How could you restore the checkpoint with fs.py? What command option did
you use? I read through the fs.py file so I
believed m5.instatiate(<checkpoint_dir>) is enough. I am using
- gem5 version [DEVELOP-FOR-V21.2]
- commit 6811158b28bd293487fb5e4bbbfb4bc2d5c259cb
- GCC version 7.5.0 and 11.1.0 (I tried both)
- Ubuntu 18.04
Best regards,
Duc Anh
On Tue, 5 Oct 2021 at 03:43, Eliot Moss <m...@cs.umass.edu> wrote:
> On 10/4/2021 4:46 PM, Đức Anh via gem5-users wrote:
> > Dear all,
> >
> > I am trying to use the checkpoint feature to skip the long and tired
> Linux booting part of the ARM
> > FS simulation. However, Gem5 throws the Segmentation fault when I try to
> restore the checkpoint. It
> > works fine with AtomicSimpleCPU, though.
> >
> > Here is the script I used to take the checkpoint
> > - run ./m5 checkpoint through the connected terminal
> > - in the python script, run m5.checkpoint("m5out/cpt.%d") and
> m5.simulate() again.
> >
> > Then I restore the checkpoint by:
> > m5.instantiate(<checkpoint_dir>)
> > m5.simulate()
> >
> > There is no CPU switching. I used DeriveO3CPU
> >
> > I also tried the fs.py script with --checkpoint-restore option but the
> problem persists. Here is the
> > error log:
> >
> > --- BEGIN LIBC BACKTRACE ---
> > build/ARM/gem5.opt(_ZN4gem515print_backtraceEv+0x2c)[0x55a2b680abec]
> > build/ARM/gem5.opt(+0x1c346ef)[0x55a2b68266ef]
> > /lib/x86_64-linux-gnu/libpthread.so.0(+0x12980)[0x7fa8ee493980]
> > --- END LIBC BACKTRACE ---
> > Segmentation fault (core dumped)
> >
> > I read in one of the older emails that fs.py is outdated. Perhaps
> dealing with checkpoint and
> > DerivO3CPU need another way?
>
> See recent posts - folks are on the trail of a bug in either
> the C++ code, C/C++ libraries, or C++ compiler / tool chain.
> If it's the same bug then it has to do with the simulator's
> memory management somehow (or a pointer gets zapped) - the
> result is a bad free. This may NOT be the same issue. The
> backtrace I get from gem5.opt indicates a bad free with
> tcmalloc reporting it.
>
> fs.py has worked for me, maybe with some customizations.
> I think that the wording about it is trying to suggest that
> it's perhaps a bit rigid or limiting for things a lot of people
> may want to do ...
>
> Regards - Eliot Moss
>
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