Attack on Thanos...

The following characters all turn intangible. Sneaking up on Thanos from below ground, they all rise and occupy the same physical space as the Titan. Then they simultaneous max out to their highest possible density.

Does Thanos survive? Assume this is pre-TI Thanos when he could still die. If he can't survive, who could? Juggernaut? Hulk? Wolverine?

Vision (classic)
Vision (current)
Kitty Pryde
Red Ghost
Flash (Barry)
Flash (Wally)
Silver Surfer
Ghost (Thunderbolts)
Moonstone
Martian Manhunter
Miss Martian
Firestorm
Firehawk
Mr M
Shinobi Shaw

Would the Flashes be able to vibrate inside (of him) and give him a stroke or aneurysm or something like that?

I can see this thread getting into a mess.

Thanos absorbs them mwahahaha

They would all die. Thanos' form is denser than any of these guys by far, so the first thing that they would want to do when becoming tangible, would be to get out of his body, or die in agony.