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sqlite: database is locked #17859

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edsantiago opened this issue Mar 20, 2023 · 7 comments · Fixed by #17953 or #18339
Closed

sqlite: database is locked #17859

edsantiago opened this issue Mar 20, 2023 · 7 comments · Fixed by #17953 or #18339
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bugweek flakes Flakes from Continuous Integration kind/bug Categorizes issue or PR as related to a bug. locked - please file new issue/PR Assist humans wanting to comment on an old issue or PR with locked comments. sqlite Bugs pertaining to the sqlite database backend

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@edsantiago
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Almost certainly related to #17858 but I will let someone else decide and possibly merge.

  Podman start after signal kill
  ...
  podman [options] --db-backend sqlite --storage-driver vfs ps -q
  Error: switching journal to WAL mode: database is locked

Unfortunately, this is also happening a lot in cleanup, where for long and horrible complicated reasons my flake logger cannot detect:

$ podman [options] rm -fa -t 0
Error: adding container id to database: database is locked

https://api.cirrus-ci.com/v1/artifact/task/4709781731016704/html/int-podman-fedora-37-rootless-host-sqlite.log.html#t--netns--1

https://api.cirrus-ci.com/v1/artifact/task/6409078293921792/html/int-podman-fedora-37-rootless-host.log.html#t--Podman-start-after-signal-kill--1
@edsantiago edsantiago added flakes Flakes from Continuous Integration sqlite Bugs pertaining to the sqlite database backend labels Mar 20, 2023
@edsantiago
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Here's one in podman run --rm (f37 root):

# podman run --rm -d --name JRhbDObiOp quay.io/libpod/testimage:20221018 top
Error: adding container id to database: database is locked

(there's another one in that same log, with restart)

Here's one in podman-remote

@vrothberg
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@mheon @baude FYI

@vrothberg vrothberg mentioned this issue Mar 21, 2023
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@vrothberg
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Opened #17867 as an anticipated fix.

vrothberg added a commit to vrothberg/libpod that referenced this issue Mar 21, 2023
@vrothberg
sqlite: set connection attributes on open
58d4b15 
The symptoms in containers#17859 indicate that setting the PRAGMAs in individual
EXECs outside of a transaction can lead to concurrency issues and
failures when the DB is locked.  Hence set all PRAGMAs when opening
the connection.  Move them into individual constants to improve
documentation and readability.

Further make transactions exclusive as containers#17859 also mentions an error
that the DB is locked during a transaction.

[NO NEW TESTS NEEDED] - existing tests cover the code.

Fixes: containers#17859
Signed-off-by: Valentin Rothberg <[email protected]>
@edsantiago
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Sorry:

Podman start after signal kill
...
# podman [options] run --http-proxy=false --name test1 -d quay.io/libpod/alpine:latest top
# podman [options] ps -q
Error: cannot connect to database: database is locked

In f36 root container, and this is in my #17831 PR which includes all sqlite fixes so far as of Monday.

@edsantiago edsantiago reopened this Mar 27, 2023
@edsantiago
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Another one, f37 rootless host (not container).

vrothberg added a commit to vrothberg/libpod that referenced this issue Mar 28, 2023
@vrothberg
sqlite: do not Ping() after connecting
cdb5b3e 
`Ping()` requires the DB lock, so we had to move it into a transaction
to fix containers#17859. Since we try to access the DB directly afterwards, I
prefer to let that fail instead of paying the cost of a transaction
which would lock the DB for _all_ processes.

[NO NEW TESTS NEEDED] as it's a hard to reproduce race.

Fixes: containers#17859
Signed-off-by: Valentin Rothberg <[email protected]>
@vrothberg vrothberg mentioned this issue Mar 28, 2023
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@edsantiago edsantiago added the kind/bug Categorizes issue or PR as related to a bug. label Mar 28, 2023
@edsantiago
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Sorry. Seen in my no-flake-retries PR, f37 rootless, the usual symptom (in podman ps):

$ podman [options] ps -q
Error: checking if DB config table exists: database is locked

This version of the CI run DOES NOT include the WAL diffs, it's just hammering at sqlite. Reopening, sorry.

@edsantiago edsantiago reopened this Apr 19, 2023
@vrothberg
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Cc: 🚑 @mheon

@vrothberg vrothberg mentioned this issue Apr 25, 2023
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vrothberg added a commit to vrothberg/libpod that referenced this issue Apr 25, 2023
@vrothberg
sqlite: move first read into a transaction
bbe9d61 
According to an old upstream issue [1]: "If the first statement after
BEGIN DEFERRED is a SELECT, then a read transaction is started.
Subsequent write statements will upgrade the transaction to a write
transaction if possible, or return SQLITE_BUSY."

So let's move the first SELECT under the same transaction as the table
initialization.

[NO NEW TESTS NEEDED] as it's a hard to cause race.

[1] mattn/go-sqlite3#274 (comment)

Fixes: containers#17859
Signed-off-by: Valentin Rothberg <[email protected]>
@github-actions github-actions bot added the locked - please file new issue/PR Assist humans wanting to comment on an old issue or PR with locked comments. label Aug 26, 2023
@github-actions github-actions bot locked as resolved and limited conversation to collaborators Aug 26, 2023
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bugweek flakes Flakes from Continuous Integration kind/bug Categorizes issue or PR as related to a bug. locked - please file new issue/PR Assist humans wanting to comment on an old issue or PR with locked comments. sqlite Bugs pertaining to the sqlite database backend
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