Kernel hangs on reboot on system with 05/2013~06/2013 CURRENT sources

Attilio Rao attilio at
Wed Jun 26 01:19:39 UTC 2013

On Tue, Jun 25, 2013 at 11:27 PM, Florian Smeets <flo at> wrote:
> On 06/25/2013 22:45, Garrett Cooper wrote:
>>     Long story short is that I've run into an issue on several VM
>> images and real machines where UFS on mpt fails to reboot because it
>> hangs in the kernel. I don't have any specific details, other than it
>> occurs regularly with cam/mpt on VMware boxes running builds; however
>> I've also seen this occur with a Dell box that has an mpt SAS
>> controller with 2 zpools and gobs of RAM. Does anyone know of any
>> issues in this area [recently]?
>>     This set of issues appears to have started cropping up after
>> 03/2013, because I was running reliable builds off those sources.
>> Thanks!
>> -Garrett
> Yes, I saw the same thing today when rebooting a box running r251905:
> Tue Jun 18 10:12:42 CEST 2013 with ahci on a zfs only system.
> I update this box about once a week, that previous kernel was from Jun
> 11. and that still rebooted successfully. As the kernel from June 18. is
> now kernel.old I don't know the SVN rev for the June 11 kernel, but it
> looks like it was broken between June 11. and 18.

Can you break into KDB once the loop happens?


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