Medusa gets killed due to excessive memory usage

[YoussefAbtk]

Hi. I am using version 1.1.0 but the process is abruptly killed by my system after few seconds:

zsh: killed     medusa fuzz

Checking the logs reveals that Medusa consumes an extremely high amount of memory (~90GB), causing macOS to terminate it due to low swap space.

kernel:  kernel: process medusa[2601] caught waking the CPU 45001 times over ~175 seconds, averaging 256 wakes / second and violating a limit of 45000 wakes over 300 seconds
 kernel: low swap: killing largest compressed process with pid 2601 (medusa) and size 93366 MB

I tried to change the number of workers or even the workerResetLimit in my config file but it didn't help me at all.

[anishnaik]

Hi @YoussefAbtk thank you for reporting this. I actually stumbled upon this yesterday as well. I am investigating on my end where things are going wrong. Would you be comfortable sharing the source code that you used to trigger this?

[YoussefAbtk]

Hi @anishnaik, Yes, of course, I’m okay with sharing the source code.

[anishnaik]

@YoussefAbtk thank you, really appreciate it. How long does it take for the kernel to kill the process?

[YoussefAbtk]

You welcome @anishnaik, I would say 12 seconds after running the transaction in the corpus.

[anishnaik]

Okay, thank you so much @YoussefAbtk. Will investigate ASAP.

[YoussefAbtk]

No problem, happy to help 🫡

[anishnaik]

@YoussefAbtk how big is the corpus btw? in terms of MB?

[YoussefAbtk]

@anishnaik It's 79.9 MB for the call_sequences and 225 KB for the test_results

[anishnaik]

@YoussefAbtk can you do me a favor and try running Medusa v1.0.0 with the same corpus? I want to see if the OOM bug still exists in that release. If it doesn't then it would really narrow down the search space for where the bug might be.

[YoussefAbtk]

@anishnaik yes of course, I’ll give it a try and get back to you.

[YoussefAbtk]

@anishnaik unfortunately it's the same with this version :

zsh: killed     medusa fuzz

kernel: low swap: killing largest compressed process with pid 90714 (medusa) and size 90368 MB

[anishnaik]

Okay, that's good to know. Thanks @YoussefAbtk.