compression failed during “Create the input directory and the output directory for Janus” phase

[limbo-wg]

when I run fuzzer after create seed programs, with the code:
./core/afl-image-syscall/afl-fuzz -b btrfs -s fs/btrfs/btrfs_wrapper.so -e ./samples/evaluation/btrfs-00.image -S btrfs -y prog -i input -o output -m none -u 2 -- ./lkl/tools/lkl/btrfs-combined -t btrfs -p @@

I got the outcome as follows:
afl-fuzz 2.52b by lcamtuf@google.com
[+] [fs-fuzz] shm name to store image buffer: btrfs
[+] [fs-fuzz] target wrapper (.so) path: fs/btrfs/btrfs_wrapper.so
[+] [fs-fuzz] seed image path: ./samples/evaluation/btrfs-00.image
[+] [fs-fuzz] syscall input directory: prog
[+] You have 48 CPU cores and 1 runnable tasks (utilization: 2%).
[+] Try parallel jobs - see docs/parallel_fuzzing.txt.
[+] Found a free CPU core, binding to #2.
[] Checking core_pattern...
[] Checking CPU scaling governor...
[+] [+] Open shm btrfs success.
[+] [+] Map shm btrfs at 0x7fdc3ac9b000 size: 0x8000000.

[-] image ./samples/evaluation/btrfs-00.image compression failed.
Location: compress(), btrfs_fuzzer.cc:211

can anyone tell me why I got this error?

[docfate111]

@limbo-wg I got the same email and also don't know why

[docfate111]

at this place in the code
here at the steps i took https://github.com/docfate111/badfsfuzzer/blob/main/janusdocker/Dockerfile

[r00tus3r]

I also came across this issue. I resolved it by increasing the shm size. (https://stackoverflow.com/questions/30210362/how-to-increase-the-size-of-the-dev-shm-in-docker-container)

By default it is 64 MB and the image file the program tries to read is 128 MB. So it is unable to read it fully.