dumping this here so it's not lost Starting xterm (and amdcccle too, apparently) crashes X with some kernel versions. Rough bisect shows that v4.1-rc5 is bad and rc6 and up is good.
I'm hopeful that Timo can do the kernel bisect to find the patch that fixed the crash (so that we have some idea where to look for the underlying bug and decide whether or not it was just a side-effect of the bug the patch fixed), also having an Xorg.0.log from a debug=full run leading up to the crash may shed light onto the trigger in the meantime (though I'm doubtful since the crash looks like generic memory corruption - userptr?).
bisection shows it got fixed by: commit e88221c50cadade0eb4f7f149f4967d760212695 Author: Ingo Molnar <mingo@kernel.org> Date: Wed May 20 11:45:30 2015 +0200 x86/fpu: Disable XSAVES* support for now I need to try backporting that commit to the distro kernel to see if it's true..
verified that this commit fixed the crash, phew
And the patch is cc'ed stable@vger.kernel.org so it means just extra work for poor Timo! Thanks for the bug report and finding the guilty party. I was worried there for a while.
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