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chaining a process with CGroups gives an OOMkiller if stdout

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toralf
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Joined: 01 Feb 2004
Posts: 3940
Location: Hamburg

Posted: Fri Nov 08, 2024 1:08 pm Post subject: chaining a process with CGroups gives an OOMkiller if stdout

exceeds memory.max.

I do use [1] https://github.com/toralf/fuzz-utils/tree/main to fuzz test OpenSSL. I do start a new fuzzer via [2]

Code:

nice -n 3 /usr/bin/afl-fuzz -i $input_dir -o ./ $add -I $0 -- ./$(basename $exe) &>./fuzz.log &
local pid=$!
echo -e "\n started: $fuzzer (pid=$pid)\n"
sudo $(dirname $0)/fuzz-cgroup.sh $fuzz_dirname $pid # create it

and then set an upper limit for the memory the whole process group with [3]

Code:

echo "2G" >$name/memory.max

I do wonder why the process is reaped (oom-killer) by my system if the size of fuzz.log is near to the limit (2GB as in the example, verified it with 1G and 500M).

Well, my gut tells me to use tee to write into the log file, but would that help and why?

[1] https://github.com/toralf/fuzz-utils/tree/main
[2] https://github.com/toralf/fuzz-utils/blob/main/fuzz.sh#L247
[3] https://github.com/toralf/fuzz-utils/blob/main/fuzz-cgroup.sh#L27

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