1178508 - medium.com doesn’t load in Nightly 41.0a1 (2015-06-28)

Status: RESOLVED FIXED

(Core :: DOM: Service Workers, defect)

Description

[Eric A. Meyer]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:41.0) Gecko/20100101 Firefox/41.0
Build ID: 20150628030215

Steps to reproduce:

Followed a link to medium.com.  Also tried typing `medium.com` into the address bar.


Actual results:

The certificate loaded and showed as valid, but after that, nothing loaded.  Nightly kept trying to load without success.  The timed-out error was NOT triggered.


Expected results:

medium.com should have loaded.

Comment 1

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

I can confirm this behavior in 42.0a1 (2015-07-01).

One oddity was that after opening the Network tab in the DevTools, the site was able to load successfully.

So far, I have not seen any obvious errors in the Browser Console.  Gijs, maybe you have a guess what's going on here?

Comment 2

[:Gijs (he/him)]

I can't reproduce on today's (july 1) OSX nightly, on a clean profile. Can you? Are you on a non-clean profile, in which case, can you post about:support info?

Comment 3

[Brian Grinstead [:bgrins]]

The page loads for me on OSX 42.0a1 (2015-07-01) with or without e10s, and with or without the netmonitor opened.

UA: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:42.0) Gecko/20100101 Firefox/42.0

Comment 4

[Brian Grinstead [:bgrins]]

The only interesting thing I see is in stdout and where it is dumping the string: 'https://medium.com/service-worker.js'

Comment 5

[Brian Grinstead [:bgrins]]

Also confirmed that the page is loading on Win7 42.0a1 (2015-07-01).  UA: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0

Comment 6

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

Looking in about:serviceworkers, I did have a service worker registered for medium.com.  After clicking "Unregister" on about:serviceworkers, the site loaded correctly.

So, while it seems hard to reproduce, it appears possibly related to service workers in some way.

Comment 7

[:Gijs (he/him)]

I wonder if we have contacts at medium at all...

Comment 8

[Eric A. Meyer]

I’ll tweet to see if I can catch anyone’s attention.

Comment 9

[Ben Kelly [:bkelly, not reviewing]]

There is a serviceworker script, but its basically empty.  Trying to figure out whats breaking.

Comment 10

[Ben Kelly [:bkelly, not reviewing]]

It appears to be failing in nsDocShell at the IsThirdPartyURI() check:

  https://dxr.mozilla.org/mozilla-central/source/docshell/base/nsDocShell.cpp?from=nsDocShell.cpp&case=true#14061

Comment 11

[Ben Kelly [:bkelly, not reviewing]]

Ignore comment 10.  This appears to be a problem with either the Cache API or the worker ScriptLoader using the Cache API.  I think clearing the SW registration helps because it wipes out the current Cache as well.

Comment 12

[Ben Kelly [:bkelly, not reviewing]]

Attachment: ServiceWorker scripts should never be intercepted. r=baku

This patch prevents SW script loads from be intercepted.  It seems to fix the problem for me, although getting into the state is a bit intermittent.

I believe what was happening was that the ServiceWorker script load itself was getting intercepted by the current ServiceWorker.  This created a deadlock.

I don't fully understand why we don't always hit this.  I think if the registration process successfully puts the value in the Cache in time, then we avoid the loop patch.  Its unclear to me when that would happen, though.

This may be fallout from bug 1167296, but I'm not sure.

In any case, I think we clearly want to avoid intercepting SW scripts per the spec, so this fix is needed regardless.

Comment 14

[Pulsebot]

https://hg.mozilla.org/integration/mozilla-inbound/rev/9ac36249a38b

Comment 16

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/9ac36249a38b

Comment 17

[Noemí Freire (:noemi)]

checked in Nightly with today's (7/3) master build and medium.com is properly loaded. Thanks!

Comment 18

[Eric A. Meyer]

I tested with the 7/3 build and can sometimes load medium.com, but not always.  Sometimes I get the infinite hang, and other times pages load up just fine.  Is there something I should try clearing or resetting?

Comment 19

[Dirkjan Ochtman (:djc)]

I'm still having trouble with 42.0a1 from 2015-07-05. Anyone else?

Comment 20

[Ben Kelly [:bkelly, not reviewing]]

Eric, Dirkjan, please use about:serviceworkers to unregister the ServiceWorker for medium.com and try again.  Its possible the registration database is in a bad state.

Comment 21

[Dirkjan Ochtman (:djc)]

That seems to work for me.

Comment 22

[Eric A. Meyer]

Confirmed that the problem persisted in 42.0a1 (2015-07-05) until unregistering the SW for medium.com.  Once I did that, the site loaded fine.

Comment 23

[Tim Taubert [:ttaubert] (inactive)]

We can continue this in bug 1180765 if you all want.

Comment 24

[mironchikpavel]

Have this problem in Firefox 51.0.1 32bit and in last Firefox for Android too. Here is screenshot: http://joxi.ru/82QVPG8fjpXZ1A

Have not SW for medium.com in about:serviceworkers. Chrome on the same PC and smartphone opens medium.com well.