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InvalidMemoryOperationError with MySQL pool under heavy load #117

Abscissa opened this Issue Oct 26, 2012 · 1 comment


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Abscissa commented Oct 26, 2012

Not sure if this is an issue with Vibe.d or mysqln (or DMD/druntime for that matter), so I'm posting it here. I don't know whether or not this might have anything to do with the mysql pool not reopening forcibly-closed connections.

My setup: Win7 64-bit 2-core, DMD 2.060 32-bit, Vibe.d v0.7.8, Vibe.d's branch of mysqln

Test source:

import mysql.db;
import vibe.d;

MysqlDB dbPool;
static this()
    dbPool = new MysqlDB("localhost", "testdbuser", "testpass", "testdb");

    auto settings = new HttpServerSettings();
    settings.port = 8181;

    auto router = new UrlRouter();
    router.get("/dbtest", &doDB);

    listenHttp(settings, router);

void doDB(HttpServerRequest req, HttpServerResponse res)
    auto conn = dbPool.lockConnection();

If I do:

ab -r -n 1000 -c 1000

Then I randomly get one of the following results:

[00A80F80:00000000 INF] Running event loop...


[02240F80:00000000 INF] Running event loop...
[02240F80:00000000 ERR] Unhandled exception in event loop: core.exception.Assert
Error@vibe.core.drivers.libevent2(262): Assertion failure
0x004F34EC in char[][]
0x004F3377 in
0x004D5D17 in onAssertError
0x0046C7DA in extern (C) void vibe.core.drivers.libevent2.Libevent2Driver.onDnsResult(int, char, int, int, void*, void*) at C:\DevProj\darticles\..\vibe.d-0.7.8\source\vibe\core\drivers\libevent2.d(263)
0x6842E05C in evdns_set_log_fn
0x00486287 in int vibe.core.core.runEventLoop() at C:\DevProj\darticles\..\vibe.d-0.7.8\source\vibe\core\core.d(58)
0x0048E4CF in _Dmain at C:\DevProj\darticles\..\vibe.d-0.7.8\source\vibe\appmain.d(38)
0x004CFB98 in extern (C) int rt.dmain2.main(int, char**).void runMain()
0x004CFBD2 in extern (C) int rt.dmain2.main(int, char**).void runAll()
0x004CF7F4 in main
0x004F9FC5 in mainCRTStartup
0x7539339A in BaseThreadInitThunk
0x77A69EF2 in RtlInitializeExceptionChain
0x77A69EC5 in RtlInitializeExceptionChain

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Abscissa Oct 27, 2012

This seems likely a duplicate of #30. If further investigation reveals they're separate, we can reopen.

Abscissa commented Oct 27, 2012

This seems likely a duplicate of #30. If further investigation reveals they're separate, we can reopen.

@Abscissa Abscissa closed this Oct 27, 2012

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