When this bug happens:
I start Minecraft then go onto "Multiplayer".
I click on any server (does not matter whether it has been detected as accessible or not accessible) and click join.
On the loading screen (searching for server... / joining server...) or after Minecraft fails to join a server I click cancel.
I am now back on the menu screen as normal and I click the "Multiplayer" button again.
Minecraft instantly freezes and becomes totally unresponsive. Basically it crashes. However it does not close on its own or even say "not responding" - it just sits there frozen.
When I go to close it with Task Manager, Windows tells me that "Java Platform (SE) Binary has stopped working".
Extra Info:
I know of other people on the forums having this bug as early as 1.3.1 and having it all the way up to the present (as have I).
On top of this problem, for myself and several others this bug always causes the "When Minecraft Closes, Javaw.exe stays running" bug. I do not know if the two bugs have some sort of link but because the javaw bug already has a ticket (https://mojang.atlassian.net/browse/MC-1408#comment-20993) I will not go into detail.
Post Script - What happens when trying to get crash report:
I tried all three methods to get a crash report stated on the Minecraft Wiki.
When I start the batch file, Minecraft starts normally as it should do. I replicate the crash (Multiplayer -> any server -> cancel -> multiplayer) but the log file does not say anything past "connecting to server whateveritwas". I close Minecraft with Task Manager, which suddenly tells me that I am using 98% of my memory and the culprit is the process "java.exe" that has just started leaking memory massively and like the javaw.exe bug metioned above, nothing can close it. To top the problem off, I still have no more data in my crash report because the batch file trying to record my internal commands has been overloaded by whatever is crashing Minecraft and CMD and the whole of System 32 have been taken down by it! (Last step, force shutdown using tower button and sigh heavily...)
Linked issues
duplicates
Comments

Sorry, forgot to get a crash report because the javaw bug mentioned makes it hard to continue using my computer after MC has crashed without a restart. I will attach a crash report tomorrow if that is okay because it's getting a bit late now.
OK, as said above, I cannot get a crash report because the crash crashes the crash report recorder. With the weird stuff with Java staying open, I am inclined to think that this bug (or parts of it) is somehow linked to the "Javaw.exe not closing bug" HERE: https://mojang.atlassian.net/browse/MC-1408
Attached the batch file that causes my issues when trying to log the error.
So what turns up in log.txt after running that?
The log file says Minecraft starts, I log in, I try to join server then nothing else because the MC crash crashes system 32 without giving it a chance to record the crash in the log.
Edit: The main reason I attached the batch is so that people can check that I didn't make any errors in it that could have compounded the bugs I was trying to record. Although as it was copy-pasted from the wiki, that seems unlikely.
https://mojang.atlassian.net/browse/MC-60
Can confirm this. I have the exact same issue as you.
Duplicate of MC-60.
Same here, did you get it fixed? If so, HOW?!
My computer has been crashed for 4 hours now...... Starting to wonder if my computer will recover.
HAPPY DAYS!!! It recovered and I re-downloaded minecraft, but this time, the 600kb one, works way better now!
Please attach a crash log.