386880 - JS-implemented net-content-sniffer leads to an infinite recursive loop at startup.

Status: RESOLVED DUPLICATE of bug 386376

(Core :: General, defect)

Description

[David Teller [:Yoric] - still alive but not very active]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.4) Gecko/20070602 Firefox/2.0.0.4 (Swiftfox) XPCOMViewer/0.9.5
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.4) Gecko/20070602 Firefox/2.0.0.4 (Swiftfox) XPCOMViewer/0.9.5

I've implemented a nsIContentSniffer using JavaScript/XPConnect. When installing the extension, no problem, works like a charm. Restart Firefox and segfault for ever. Comment out the "net-content-sniffers" line from compreg.dat and it works.

Reproducible: Always

Steps to Reproduce:
1. Implement a nsIContentSniffer in JavaScript.
2. Add it to the category "net-content-sniffers" as persistent
3. Restart Firefox.

Actual Results:  
Segfault


I'll attach the stack trace.

Comment 1

[David Teller [:Yoric] - still alive but not very active]

Attachment: Stack trace for this bug

Comment 2

[David Teller [:Yoric] - still alive but not very active]

Suggested workaround (for now): developers who wish to implement a content sniffer in JS shouldn't register it as persistent. Rather, they should make the component a nsIObserver, wait for app-startup and register at that moment.