I have set up a repo with gem5 that demonstrates the problem. The repo includes the latest version of gem5 from gem5's github repo with a few patches applied to get KVM working together with the kernel binary and disk image I am using. You can get the repo at https://github.com/ShehabElsayed/gem5_debug.git. <https://github.com/ShehabElsayed/gem5_debug.git>
These steps should reproduce the problem: 1- scons build/X86/gem5.opt 2- ./scripts/get_fs_stuff.sh 3- ./scripts/run_fs.sh 8 I have also included sample m5term outputs for both a 2 thread run (m5out_2t) and an 8 thread run (m5out_8t) Any help is really appreciated. On Tue, Jul 23, 2019 at 11:01 AM Shehab Elsayed <shehaby...@gmail.com> wrote: > When I enable the Exec debug flag I can see that it seems to be stuck in a > spin lock (queued_spin_lock_slowpath) > > On Fri, Jul 19, 2019 at 5:28 PM Shehab Elsayed <shehaby...@gmail.com> > wrote: > >> Hello All, >> >> I have a gem5 X86 full system set up that starts with KVM cores and then >> switches to O3 cores once the benchmark reaches the region of interest. >> Right now I am testing with a simple multithreaded hello world >> benchmark. Sometimes the benchmark completes successfully while others gem5 >> just seems to hang after starting the benchmark. I believe it is still >> executing some instructions but without making any progress. The chance of >> this behavior (indeterminism) happening increases as the number of >> simulated cores or the number of threads created by the benchmark increases. >> >> Any ideas what might be the reason for this or how I can start debugging >> this problem? >> >> Note: I have tried the patch in https://gem5-review.googlesource >> .com/c/public/gem5/+/19568 but the problem persists. >> >> Thanks! >> >
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