Re: -CURRENT userland regression

On 02/20/13 14:47, Konstantin Belousov wrote:
> On Wed, Feb 20, 2013 at 02:33:23PM -0800, Navdeep Parhar wrote:
>> On 02/20/13 14:25, Konstantin Belousov wrote:
>>> On Wed, Feb 20, 2013 at 02:21:50PM -0800, Navdeep Parhar wrote:
>>>> On 02/20/13 14:14, Xin Li wrote:
>>>>> Hi,
>>>>>
>>>>> It seems that fresh -HEAD would give an unusable kernel that
>>>>> overwrites screen buffer in a way making it impossible to debug.
>>>>> Using an old world source to do 'make buildworld buildkernel' results
>>>>> in a (mostly: I have some strange USB issue right now and still
>>>>> looking for the cause) usable kernel.
>>>>>
>>>>> For now my known good combination is world 246858 with kernel 247057.
>>>>>  I'm still trying to find out which revision have broke the stuff.
>>>>
>>>> I ran into this earlier today.  Selecting "safe mode" in the boot loader
>>>> menu seems to work around the problem on my system.  Now I will not
>>>> reboot until I see a fix for this in head :-)
>>>
>>> How much 'the earlier today' is ?
>>> I.e., could you specify some revisions ?
>>>
>>
>> I upgraded from a month old (approx.) head to r247054 and ran into this
>> problem.  I haven't tried bisecting as I need a running system right now.
> 
> BTW, does the loader fails, or is it the kernel where the problems start
> appearing ?
> 

The problem occurs well after the kernel is up and running.  The last
messages that were readable were from ugen/uhub and ada0.  The rest was
garbled and the system froze solid something after that.  I tried
pinging it but it wasn't reachable so this wasn't a case where the
console was trashed but system was running.

This is amd64 built with clang.  I have dual consoles - serial and VGA.

FreeBSD trantor 10.0-CURRENT FreeBSD 10.0-CURRENT #26: Wed Feb 20
13:18:48 PST 2013     root_at_trantor:/usr/obj/usr/src/sys/TOEKTR  amd64

Regards,
Navdeep