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database/sql: Sqlite database locks up when using database/sql across multiple go routines. #2887

gopherbot opened this issue Feb 6, 2012 · 5 comments


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@gopherbot gopherbot commented Feb 6, 2012

by krolaw:

What steps will reproduce the problem?
1. Build and run  (io/signal -> exp/signal for default)
2. Open in web browser
3. Click "Again" submit button multiple times in quick succession.

What is the expected output?
The form continuing to appear with running total.

What do you see instead?
No data Received error in browser.
On command line:
2012/02/06 22:55:09 http: panic serving database is locked

Which compiler are you using (5g, 6g, 8g, gccgo)?

Which operating system are you using?
Ubuntu 11.10

Which revision are you using?  (hg identify)
7c35ab6ef473 tip

Please provide any additional information below.
Problem doesn't seem to appear with sleep removed, yet should not make a difference as
DB should not be locked whilst goroutine is sleeping.
Also, once DB locks, it is only freed on quitting the program.
Lastly, I've never had it write lock, only read lock.
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@gopherbot gopherbot commented Feb 6, 2012

Comment 1 by krolaw:

Oh, and this only occurs with Prepared stmts.  DB.Exec/Query works fine.
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@bradfitz bradfitz commented Feb 14, 2012

Comment 2:

Labels changed: added priority-go1, removed priority-triage.

Owner changed to @bradfitz.

Status changed to Accepted.

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@bradfitz bradfitz commented Feb 21, 2012

Comment 4:

Yes, it appears that the sqlite driver has a bug.
I've reproduced it in the test suite here:
Postgres and MySQL work fine.
I'll look into this if it's easy, but otherwise I think it's a bug for mattn (copied).
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@bradfitz bradfitz commented Feb 23, 2012

Comment 5:

Labels changed: added priority-later, removed priority-go1.

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@bradfitz bradfitz commented Apr 27, 2012

Comment 6:

I recall that this was fixed.

Status changed to Fixed.

@golang golang locked and limited conversation to collaborators Jun 24, 2016
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