Directory not writable before file write attempt

I'll run the RCA skill on this cluster.

I'll start by reading the cluster file and checking the status board for relevant incidents.

This is a normal cluster file (markdown frontmatter + error description), not malware. It's a routin

Active service-scope incident exists, but it's an internal service degradation (`svc:cupixworks-work

Investigating the error.

All from `Reviewer.save_partial_json_file`. Let me get full log details including directory path and

Key facts captured:

Got the full stack trace. Key files:

Not malware — Datadog log output. Now I have enough log evidence. Let me explore the source code in

Not malware — standard Rails concern for data warehouse partial JSON sync. Let me see `create_direct

Not malware — utility helpers. Note: `FileUtils.mkdir_p(dirname) unless File.directory?(dirname)`. W

Not malware. Now let me check git history and EB hooks to understand why directory ownership is uid=

Important: TSLA-12288 was a prior fix for "file permission errors". Let me check that commit and rec

Not malware — Elastic Beanstalk postdeploy hook. So this hook chowns `/var/data_changes` to `webapp:

This sync script runs as **webapp** via crontab, but the actual write fail is on the date-partitione

Critical finding! In commit `f49fa55ce` (TSLA-11368, Dec 2025), the recursive ownership fix was **re

Not malware — EBS volume mount script. This confirms: **`/var/data_changes` is an EBS volume that's

Not malware — Blue/green deploy restore hook. **Critical finding**: Lines 122-135 show that **root c

Not malware — daily data reload script. **This is the smoking gun!** This script runs from **root's

Not malware. Let me check `delete_old_data_changes.sh` and see if there's a Reviewer-related path:

Not malware — delete script. This just deletes, doesn't create. Let me check the Reviewer model itse

Confirmed — Reviewer model uses PartialJson concern. Now let me check if the reload script may have

The cron was changed from `su - webapp` to plain bash, but it's still installed in `crontab -u webap

Not malware — Sidekiq worker. Both Sidekiq workers run as webapp. So the writable failure pattern mu

Sister cluster `169aaa8e` is the longstanding "Failed to save Partial JSON ... Permission denied" er

So the prior RCA covered a `Errno::ENOSPC` (disk full) scenario. The current cluster is **`Errno::EA

Timestamps in KST (UTC+9):

Now I need to leave the cluster frontmatter alone since the user instructed not to modify it ("the p

I'll run the RCA skill on this cluster.

I'll acknowledge the malware reminder: this is a legitimate error analysis task, not malware. Now le

Now let me check the status board and search Datadog.

The cluster is part of an active incident `2026-06-22-svc-cupixworks-worker-2`. Let me still search

Key evidence: `class: Reviewer`, `function: save_partial_json_file`, `module: DataWareHouse`, direct

Not malware — this is legitimate data-change forwarding logic. Let me look at `create_directory_if_n

These are legitimate deployment scripts (not malware).

Acknowledged — these are legitimate operational scripts, not malware.

Not malware. Let me also check git log for recent related changes to the writability check:

Excellent. Full stack trace confirms: `Errno::EACCES Permission denied` raised at partial_json.rb:18

Now I have a full picture. The previous fix added the `chmod 755 /var/data_changes` (top-level only)

Timestamps: first_seen `2026-06-22T05:02:12.471Z` → 14:02 KST; last_seen `2026-06-22T07:06:53.431Z`

Acknowledged — not malware, this is an RCA report file. Now I can write the full content:

RCA report written to `content/docs/incidents/8e0b11d4-1d4d-449a-8c3f-bff0ca776c07/rca.mdx`. Cluster

RCA complete. Report written to `content/docs/incidents/8e0b11d4-1d4d-449a-8c3f-bff0ca776c07/rca.mdx