#ext4

Operating Systems Bug Report

df says the disk is 100% full but du finds only a third: deleted files still held open

John Nguyen · Feb 23, 2026 · 9 min read

A ledger worker went down with No space left on device while du could account for only 31 GB of a 98 GB volume. A log file deleted by logrotate was still open in the JVM and kept growing. We freed it without a restart and fixed the rotation.

Operating Systems Bug Report

"No space left on device" with 30% disk free: inodes exhausted by millions of session files

Kenji Watanabe · Oct 18, 2025 · 7 min read

Uploads and deploys failed with No space left on device while df showed 30% free. The filesystem had run out of inodes: a session directory held 9.6 million tiny files. How we found it with df -i, cleaned it without locking the box, and stopped it coming back.