Re: Boot panic -CURRENT #196643

Kostik Belousov wrote:
> On Sat, Aug 29, 2009 at 10:44:52PM +0200, Andreas Tobler wrote:
>> Kostik Belousov wrote:
>>> On Sat, Aug 29, 2009 at 10:00:45PM +0200, Andreas Tobler wrote:
>>>> Kostik Belousov wrote:
>>>>> On Sat, Aug 29, 2009 at 08:32:34PM +0200, Andreas Tobler wrote:
>>>>>> Hello,
>>>>>>
>>>>>> I synced the sources today to #196643.
>>>>> Try 196644.
>>>> [tc:head/src/sys] andreast% svn info
>>>> Path: .
>>>> URL: svn://svn.freebsd.org/base/head/sys
>>>> Repository Root: svn://svn.freebsd.org/base
>>>> Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
>>>> Revision: 196644
>>>> Node Kind: directory
>>>> Schedule: normal
>>>> Last Changed Author: kib
>>>> Last Changed Rev: 196644
>>>> Last Changed Date: 2009-08-29 20:01:02 +0200 (Sat, 29 Aug 2009)
>>>>
>>>> Still the same, as below.
>>>>
>>>> But with WITNESS etc. on:
>>>>
>>>> I get this panic:
>>>> ---
>>>> Trying to mount root from zfs:zroot
>>>> panic: thread_alloc got thread with kstack
>>>> cpuid = 0
>>>> KDB: enter: panic
>>>> [thread pid 1 tid 100002 ]
>>>> Stopped at	kdb_enter+0x3a: movl	$0,kdb_why
>>> Can you show me the backtrace (from ddb) ?
>> I would like, yes, but as I said, the keyboard is not functional at this 
>> moment, it would be activated after this mount.
>>
>> Do I have other possibilties to get in connection with this machine?

I tried "26.6.2 Serial Console Configuration, Terse Version"

And now I can't boot at all.

I have a second partition with 8.0BETA3 on this machine, this one I can 
boot. But how can I mount a zfs root ?

tc# gpart show ad4s4
=>        0  251371512  ad4s4  BSD  (120G)
           0  242982904      1  freebsd-zfs  (116G)
   242982904    8380811      2  freebsd-swap  (4.0G)
   251363715       7797         - free -  (3.8M)


I'd like to mount ad4s4a to /mnt with the following command:

tc# mount -t zfs /dev/ad4s4a /mnt
mount: /dev/ad4s4a : Invalid argument

Any idea what I'm doing wrong? Or is it not possible?

>>
>>
>>
>>>>>> And built a kernel with WITNESS etc. off.
>>>>>>
>>>>>> My boot partition sits on zfs.
>>>>>>
>>>>>> I get the below panic. Unfortunately I can't bt since the usb keyboard 
>>>>>> ist not functional at this moment.
>>>>>>
>>>>>> ---
>>>>>> Trying to mount root from zfs:zroot
>>>>>> spin lock 0x80dccc00 (sched lock 1) held by 0x8595baf0 (tid 100003) too 
>>>>>> long
>>>>>> panic: spin lock held too long
>>>>>> cpuid = 0
>>>>>> KDB: enter: panic
>>>>>> [thread pid 1 tid 100002 ]
>>>>>> Stopped at	kdb_enter+0x3a: movl	$0,kdb_why
>>>>>> ---
>>>>>>
>>>>>> Unfortunately I can't say exactly which version the previous, working, 
>>>>>> kernel has. The svn nbr has gone. (I have this subversion:
>>>>>> subversion-freebsd-1.6.5)
>>>> This question is still open.
>>> r196639 will work for you.
>> :) I'll need a quick eye on it then.
> 
> Please, try this.

I'll do so, asap I can boot again.

Thanks,
Andreas

> 
> diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c
> index 234cde9..b0e8d3c 100644
> --- a/sys/vm/vm_glue.c
> +++ b/sys/vm/vm_glue.c
> _at__at_ -447,6 +447,8 _at__at_ vm_thread_dispose(struct thread *td)
>  	pages = td->td_kstack_pages;
>  	ksobj = td->td_kstack_obj;
>  	ks = td->td_kstack;
> +	td->td_kstack = 0;
> +	td->td_kstack_pages = 0;
>  	if (pages == KSTACK_PAGES && kstacks <= kstack_cache_size) {
>  		ks_ce = (struct kstack_cache_entry *)ks;
>  		ks_ce->ksobj = ksobj;
> _at__at_ -457,8 +459,6 _at__at_ vm_thread_dispose(struct thread *td)
>  		return;
>  	}
>  	vm_thread_stack_dispose(ksobj, ks, pages);
> -	td->td_kstack = 0;
> -	td->td_kstack_pages = 0;
>  }
>  
>  static void