Engineer Tang's Implementation Study Notes
Oct 28, 2026 · Operations
Why kill -9 Fails: Troubleshooting Unkillable Linux Processes & System Hangs
This article explains why kill -9 fails to terminate Linux processes — covering guardian process restarts, uninterruptible D-state I/O waits, and zombie processes — and provides a systematic troubleshooting sequence for system-wide hangs: check disk space, OOM killer logs, and CPU vs I/O load before resorting to reboot.
OOM killerdisk spacekill command
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