On 12/10/2016 16:45, Konstantin Belousov wrote:
> On Wed, Oct 12, 2016 at 04:25:00PM +0300, Andriy Gapon wrote:
>> On 04/10/2016 20:01, Konstantin Belousov wrote:
>>> Author: kib
>>> Date: Tue Oct  4 17:01:24 2016
>>> New Revision: 306680
>>> URL: https://svnweb.freebsd.org/changeset/base/306680
>>>
>>> Log:
>>>   Re-apply r306516 (by cem):
>>>   
>>>   Reduce the cost of TLB invalidation on x86 by using per-CPU completion 
>>> flags
>>>   
>>>   Reduce contention during TLB invalidation operations by using a per-CPU
>>>   completion flag, rather than a single atomically-updated variable.
>>
>> Kostik,
>>
>> could this commit cause a problem reported in the below links?
>> https://bz-attachments.freebsd.org/attachment.cgi?id=175614
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213371
> 
> If I am reading the report right, the problem appears on the
> 11.0-RELEASE system. The patch you reference was only applied to HEAD a
> week ago and was not merged even to stable/11.

Sorry for the noise, then.  Somehow I thought that this went into the release
branch, but obviously there was too little time for that.

> The examination must start with backtracing the thread which owns the
> smp_ipi_mtx (shown on the screenshot).

It looks like DDB is not in GENERIC in 11.0?
Not sure if the reporter would be able to configure a dump device and then save
the dump given that the panic happens in the installer.
If anyone could provide them with instructions that would be great.

-- 
Andriy Gapon
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