Strange black line continuously appearing and disappearing at horizon .

Update your Java to the latest version 1.7.0_60 and try with the default resource pack. This is invalid until confirmed with those as neither are supported by current versions of Minecraft.

Then are you gonna remove invalid status when I update java and show you a new crash report?

Possibly, it depends on what the new crash report shows (not to mention if it is reproducible with that setup).

Black line is still on even after the java update(screenshot, confirmed with default resource pack), crash report : http://pastie.org/private/ffr6yuanllmzsqivlghv3a

Confirmed with default Resource pack

The new crash report still shows an out of date Java - you should check that multiple versions are not installed. Also, * When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.

Also, do you have any shaders installed?

No shaders.
Finally checked, finally it's build 60.
crash : http://pastie.org/private/ifgr2tbg6jxnzf3hhccba
Still black line.

So, the crash report is here,java build 60 is installed (checked and confirmed)...I think now it's not invalid?

Thank you for marking the first issue reporting this bug as duplicate.
>=(

If you have overwolf, or anything that overlays minecraft, uninstall it or close it.