TaoMasterCoder
10777823fe
fix(sessions): salvage a page-1-header-damaged state.db in the lost_and_found lane
...
A SIGKILL mid-write (OOM killer, #106667 ) can leave state.db with a garbage
page-1 header. SQLite refuses the file outright ("file is not a database",
SQLITE_NOTADB) and the sqlite3 shell's .recover opens the file like any other
client, so the lost_and_found lane failed with the same rc=26 twice although
every data page after the header survived. The #106587 quarantine now
preserves such a file as state.db.notadb-<ts>-<pid>.bak; this makes that
preserved file recoverable with `hermes sessions recover --source <bak>
--allow-partial`.
When both .recover attempts fail with "not a database", zero the 100-byte
header of the lane's private snapshot copy and rerun them. .recover trips
only on the magic check and infers page size and layout from the pages
themselves, so a zeroed header is enough; a spliced donor header (the PR's
original mechanism) instead advertises a database size / freelist that
contradicts the file and yields "database disk image is malformed" on a
direct open — verified live on a 139-page fixture, which also showed the
zeroed header recovers 60/60 sessions and 300/300 messages whether the
damage covers 100 bytes or the whole first page. The user's file is never
written; the report carries `sqlite3_cli.header_zeroed` and a warning about
the WAL boundary.
Live repro (sqlite3 shell 3.53.1 on PATH, header overwritten with random
bytes): BEFORE "page-level .recover salvage failed: ... file is not a
database (26)"; AFTER "Recovered 60 sessions and 300 messages", source md5
unchanged.
Salvaged from PR #102808 (intent; trimmed from 302 to ~40 source LOC by
dropping the donor-header/page-size sweep and the redundant preopen probe —
the shell's own refusal is the detector). Independent review on the PR by
@strzhao.
Refs #106667
Refs #106587
Reported-by: TaoMasterCoder
Cross-referenced-by: kshitijk4poor
2026-09-11 06:37:27 -07:00
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