5.4 hangs in UFS

[John Marino]

[resend because I used wrong address]
[sent before response below]
FWIW, for me softdeps has always been buggy.  The issues only resolve 
when it's turned off.  as far as I am concerned UFS with softdeps on DF 
has always been unusable.  Sooner or later (and usually sooner) it acts 
ups.


On 2/11/2019 11:18, Eric Melville wrote:
> Oh I hear you, and that was definitely where I pointed my finger at
> first. But I will
>
> keep digging and see where the evidence takes me for now.
>
>
> As an update, 5.2 with softdeps seems fine. 5.4 without softdeps, also
> fine. So
>
> potentially a softdeps bug introduced between the two releases. I am
> churning
>
> through a git bisect now and will hopefully have more solid data in the
> next day
>
> or so.
>
>
>> On February 11, 2019 at 9:07 AM Matthew Dillon <dillon at backplane.com>
>> wrote:
>>
>> This feels more like an issue with the I/O and not with UFS
>> specifically.  But since you tried two different storage devices it
>> couldn't be that.  Perhaps there is a power or overheat issue on the
>> system.
>>
>> -Matt
>>
>> On Sun, Feb 10, 2019 at 1:42 PM Eric Melville < eric at rigelfore.com
>> <mailto:eric at rigelfore.com>> wrote:
>>
>>     __
>>
>>     Hello there,
>>
>>
>>
>>     After installing 5.4 my system has been getting stuck in UFS,
>>     apparently in softdeps.
>>
>>     At first I was faulting the -j12 buildworld, but then saw it in
>>     lower parallel counts, and
>>
>>     eventually saw it when looping buildworld with no -j option at
>>     all. Then I was faulting
>>
>>     my fast new NVME but eventually factored that out too by changing
>>     back to an old
>>
>>     hard drive. In any case, the faster the hardware and the more work
>>     running, the
>>
>>     more quickly and easily this seems to reproduce.
>>
>>
>>     Typically during the phase that removes old output, the build will
>>     hang indefinitely.
>>
>>     Some processes continue to run but new ones never get going, and
>>     the old world
>>
>>     clean never makes any progress. For example ssh to the host in
>>     this state would
>>
>>     succeed to connect and authenticate, but the new shell never seems
>>     to run.
>>
>>
>>     I suppose I should try disabling softdeps next.
>>