wai-handler-devel segfaults

[iand675]

I haven't been able to track it down where it's happening exactly, but here's what I do know:

I ran the generator to create a fresh app with a fresh install of GHC 7.0.3. Upon running

wai-handler-devel 3000 Controller withApp --yesod

I received the following output:

Attempting to interpret your app...
Interpreting success, new app loaded
GET /
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Segmentation fault: 11

OS X 10.6 GHC 7.0.3

Packages installed by yesod & cabal install of app:

 JSONb-1.0.4
 RSA-1.0.6.1
 SHA-1.4.1.3
 asn1-data-0.4.6
 attempt-0.3.0
 attoparsec-0.8.5.2
 attoparsec-enumerator-0.2.0.3
 authenticate-0.8.2.2
 base64-bytestring-0.1.0.2
 binary-0.5.0.2
 blaze-builder-0.2.1.4
 blaze-builder-enumerator-0.2.0.2
 blaze-html-0.4.1.0
 bytestring-nums-0.3.2
 bytestring-trie-0.2.3
 cereal-0.3.0.0
 certificate-0.7.0
 clientsession-0.4.1
 control-monad-attempt-0.3.0
 convertible-text-0.3.0.9
 cookie-0.0.0
 crypto-api-0.5.2
 cryptocipher-0.2.8
 cryptohash-0.7.0
 data-default-0.2.0.1
 data-object-0.3.1.6
 data-object-json-0.3.1.6
 dataenc-0.13.0.5
 deepseq-1.1.0.2
 email-validate-0.2.6
 enumerator-0.4.9.1
 failure-0.1.0.1
 file-embed-0.0.3.1
 hamlet-0.7.3
 hjsmin-0.0.14
 http-enumerator-0.3.1
 json-enumerator-0.0.1.1
 json-types-0.1
 language-javascript-0.4.4
 mime-mail-0.1.0.1
 monad-peel-0.1
 mtl-2.0.1.0
 network-2.2.1.10
 network-bytestring-0.1.3.4
 parsec-3.1.1
 persistent-0.4.2
 persistent-sqlite-0.4.0
 pool-0.0.1.1
 primitive-0.3.1
 pureMD5-2.1.0.3
 ranges-0.2.3
 sendfile-0.7.3
 stm-2.2.0.1
 tagged-0.2
 tagsoup-0.12
 text-0.11.0.7
 tls-0.3.3
 transformers-0.2.2.0
 unix-compat-0.2.1.1
 utf8-light-0.4
 utf8-string-0.3.6
 vector-0.7.0.1
 wai-0.3.2
 wai-app-static-0.0.1.4
 wai-extra-0.3.3
 warp-0.3.3
 web-routes-0.23.4
 web-routes-quasi-0.6.3.1
 xml-1.3.7
 xss-sanitize-0.2.6
 yesod-0.7.3
 yesod-auth-0.3.2
 yesod-core-0.7.0.2
 yesod-form-0.0.0.2
 yesod-json-0.0.0.1
 yesod-persistent-0.0.0.1
 yesod-static-0.0.0.1
 zlib-0.5.3.1
 zlib-bindings-0.0.0

[iand675]

Also of note, running $(appname)-test instead works fine.

[snoyberg]

If it's a segfault, it's almost certainly not code from Yesod. The one exception would be the database backend. Which one are you using?

[iand675]

sqlite

[iand675]

However, I've tried it on a database-free app as well and still get a segfault. I'm not saying it's yesod specifically, but just wanted to make you aware.

[snoyberg]

Understood, just trying to diagnose. If you get any more information on this, please let me know. In the meanwhile, I think the major goal for Yesod 0.9 will be to overhaul wai-handler-devel. I have a few ideas of how to do that...

[iand675]

After a lot of poking around, it seems that it's a bug in Hint. Good call.

[snoyberg]

Can you send a bug report either to the author of the cafe?

[iand675]

Still doing a little investigation to get more details, will file report soon.

[jgreene]

I'm having the same problem. Running ubuntu 10.10 64bit on VirtualBox with a Windows 7 host.

Fresh install of GHC 7.02 and the haskell-platform-2011.2.0.0.

The error is: Attempting to interpret your app... Interpreting success, new app loaded GET /auth/page/email/register Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8

Segmentation fault

And looking into /var/log/syslog I find this error: Apr 8 08:45:41 ubuntu kernel: [60503.892516] wai-handler-dev[2445] general protection ip:43429d58 sp:7fa68f0f9de0 error:0 in HSnetwork-2.2.1.10.o[4340f000+132000]

[snoyberg]

I know there were a few issues with GHC 7.02. Can you try again with 7.03?

[jgreene]

I upgraded GHC to 7.03 and followed the yesod in 5 minutes steps, also unregistering wai-0.4.0 and I'm still getting a segmentation fault.

[snoyberg]

OK, sounds like more motivation to me to do the overhaul of wai-handler-devel then. I don't think fixing Hint will be an easy task. Thanks for checking on the new version.