Increase the memory allocated to 'BOT_TMPDIR' to 1GB #5078
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The 90MB tmpfs mount allocated for 'BOT_TMPDIR' is insufficient for downloading large corpus backup files, leading to the "OSError: [Errno 28] No space left on device" error in Cuttlefish and Linux hosts. This change increases the tmpfs mount size to 1GB to accommodate larger corpus backup files.
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marktefftech
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Dec 17, 2025
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@javanlacerda From our analysis, the largest corpus size needed to download is approximately ~800MB, hence the selection of 1GB as the size.
Please let us know if this works for you.
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I think it should be all good. Any inputs here @jonathanmetzman ? |
javanlacerda
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Dec 17, 2025
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ACtually better than enlarging this, could we put the backup in the same volume as the testcases? |
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| # 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/ |
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Let's put it here and increase this size to 1.25GB
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The 90MB tmpfs mount allocated for 'BOT_TMPDIR' ('/mnt/scratch0/tmp') is insufficient for downloading large corpus backups, leading to "OSError: [Errno 28] No space left on device" error in Cuttlefish and Linux hosts .
This error occurs during corpus synchronization, when a corpus backup zip file is downloaded to a temporary file within '/mnt/scratch0/tmp' in _sync_corpus_to_disk() before being extracted. If the said corpus' zip file exceeds 90MB, the download attempt fails.
This change increases the size of the 'BOT_TMPDIR' tmpfs mount to 1GB to accommodate for a large corpus backup zip file and prevent this error.