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Re: gnumach 1.7 issue


From: James Clarke
Subject: Re: gnumach 1.7 issue
Date: Sat, 4 Jun 2016 17:08:34 +0100

> On 4 Jun 2016, at 15:04, James Clarke <address@hidden> wrote:
> 
>> On 3 Jun 2016, at 19:36, Samuel Thibault <address@hidden> 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.

Reverting 1db202e indeed fixes it. I also rebuilt the same source tree with
the patch commented out in d/p/series just to be sure there wasn’t a
toolchain issue, and that build *doesn’t* work, so 1db202e is either buggy
or exposing other bugs.

James

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