Bug 966434
| Summary: | gnome-screensaver crashes when running in VNC | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Albert Flügel <af> | ||||
| Component: | gnome-screensaver | Assignee: | Ray Strode [halfline] <rstrode> | ||||
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | unspecified | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 17 | CC: | jmccann, rstrode | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
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| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2013-08-01 10:38:23 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
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Created attachment 752061 [details] Fix or workaround calling a function via a pointer, that is NULL Description of problem: When a Gnome Session (whether fallback or not does not matter) is running in a VNC server, Locking the screen does not work and the window manager becomes somewhat dysfunctional Version-Release number of selected component (if applicable): 3.4.1-1 How reproducible: Start a vnc server, connect with vncviewer, try to lock the screen or let it lock automatically Steps to Reproduce: 1. prompt# vncserver -extension RANDR 2. prompt# vncviewer :1 (or whatever session number is output by vncserver) 3. Within the session select in the top menu under the user's name on the right "Lock screen" Actual results: Display starts to darken, but then the normal desktop is visible again and the window manager seems to be canceled somehow. In the top bar a message appears "gnome-screensaver crashed ..." Expected results: Screen is locked and can be unlocked again entering the password Additional info: The gnome-screensaver gets SIGSEGV: In src/gs-fade.c in 2 lines a function is called via a pointer like this: fade->priv->screen_priv[i].fade_finish(fade, i); It seems, when running in VNC, there's no respective capability in the server, so the entire structure fade->priv->screen_priv[i] is zero, so is fade_finish. The attached patch adds a check: if fade->priv->screen_priv[i].fade_finish is NULL, the function is not called. Frankly i don't know, if this is really a fix or only a workaround. The maintainer must judge. However. One more time adding a fancy but superfluous feature introduced a new annoying bug.