Re: gnumach 1.7 issue

[James Clarke]

> On 3 Jun 2016, at 19:36, Samuel Thibault <samuel.thibault@gnu.org> wrote:
> 
> Samuel Thibault, on Fri 03 Jun 2016 20:35:13 +0200, wrote:
>> Adam Richards, on Fri 03 Jun 2016 19:30:40 +0100, wrote:
>>> On rebooting and reverting to  gnumach-1.6-486.gz this is not an issue.
>> 
>> It could be worth bisecting the issue on the upstream git repository.
> 
> (there are really not much difference between the last 1.6 snapshot
> 2:1.6+git20160502-1 and the 1.7 snapshot 2:1.7+git20160522-1)

1.7 seems to break running Xorg for me (running latest MATE). I can’t
move the mouse, opening htop via ssh hangs at a black screen, and then
subsequent ssh attempts can’t connect, so I have to perform a hard
reboot. If I don’t send *any* mouse events, htop loads, but locks up
as soon as I move the mouse. MATE’s clock does continue to update every
second, so some things still work. Booting 1.6+git20160502 instead works
fine.

Looking at the changes[1], some variables types have been changed (many
int -> unsigned, and a few int -> dev_t in xen/console.{c,h}), but I
doubt that’s it. My guess is that it’s one of:

* b4d07d3 Fix pageout deadlock
* 1db202e vm_map: back allocations with a red-black tree

I shall try building a kernel with 1db202e reverted.

James

[1] 
https://anonscm.debian.org/cgit/pkg-hurd/gnumach.git/commit/?id=8d63d9c0d3b84e8496248093ce333c959fe985c9

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