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Increase the memory allocated to 'BOT_TMPDIR' to 1GB #23

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Increase the memory allocated to 'BOT_TMPDIR' to 1GB #23

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Increase the memory allocated to 'BOT_TMPDIR' to 1GB
9640-Akhil Dec 12, 2025
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9640-Akhil Dec 19, 2025
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2 changes: 1 addition & 1 deletion docker/base/setup_clusterfuzz.sh
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Expand Up @@ -52,7 +52,7 @@ fi
# set up mounts in this case.
if [[ -z "$DISABLE_MOUNTS" ]]; then
# Setup Tmpfs dirs for frequently accessed files to save disk I/O.
mount -t tmpfs -o size=250M,mode=777 tmpfs $INSTALL_DIRECTORY/clusterfuzz/bot/inputs/fuzzer-testcases/
mount -t tmpfs -o size=1280M,mode=777 tmpfs $INSTALL_DIRECTORY/clusterfuzz/bot/inputs/fuzzer-testcases/
mount -t tmpfs -o size=10M,mode=777 tmpfs $INSTALL_DIRECTORY/clusterfuzz/bot/logs/
mount -t tmpfs -o size=90M,mode=777 tmpfs $BOT_TMPDIR

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2 changes: 1 addition & 1 deletion src/clusterfuzz/_internal/fuzzing/corpus_manager.py
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Expand Up @@ -479,7 +479,7 @@ def _sync_corpus_to_disk(self, corpus, directory):
"""Syncs a corpus from GCS to disk."""
shell.create_directory(directory, create_intermediates=True)
if corpus.backup_url:
tmpdir = environment.get_value('BOT_TMPDIR')
tmpdir = environment.get_value('FUZZ_INPUTS')
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@svasudevprasad svasudevprasad Dec 19, 2025

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Are we sure this is the only place where this needs to be changed ? What about the place where it runs all the corpus files for various runs ? Where do they get stored ? Should that space also be increased ?

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@9640-Akhil 9640-Akhil Dec 22, 2025

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Yes @svasudevprasad, we are confident that this is the only necessary change because the lifecycle of the corpus backup zip files happens entirely within a single function call and they are not used elsewhere. The temporary corpus backups are both downloaded and extracted directly to the /mnt/scratch0/clusterfuzz/inputs/data-bundles directory within the _sync_corpus_to_disk() function itself.

Regarding where the corpus files are stored and whether that space needs to be increased: the corpus files used during various runs are stored in the /mnt/scratch0/clusterfuzz/inputs/data-bundles directory. This path is not a tmpfs mount (unlike BOT_TMPDIR or the fuzzer-testcases directory), as it resides on the standard disk volume (/mnt/scratch0). Since it will have access to more than 100GB of free space, there is no need to increase the space for this.

with tempfile.NamedTemporaryFile(
dir=tmpdir, suffix='.zip') as temp_zipfile:
try:
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