That is an interesting observation. What kinds of problems? I think I saw weird
free vs used output in df too, wonder if that would have still happened with
softdeps disabled.
I think UFS support is super important for installations with, say, a small internal
system disk and big dedicated HAMMER ones. My initial draw to DragonFly was
this sort of configuration, since ZFS is ridiculously complicated and the FreeNAS
people seem to have bizarre priorities. Would it make sense to disable softdeps
by default?
Back to the original problem, I used git bisect but it wound up pointing me at some
seemingly innocuous libc mktemp change, and the nearest kernel change was
to networking, back on 11/04. I was going to give it another go with the faster block
device and hopefully get better testing results, but I have not found the time yet.
On February 11, 2019 at 10:28 AM John Marino <[email protected]> wrote:
[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 willkeep 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. Sopotentially a softdeps bug introduced between the two releases. I am
churningthrough a git bisect now and will hopefully have more solid data in the
next dayor so.>
>> On February 11, 2019 at 9:07 AM Matthew Dillon <[email protected]>
>> 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 < [email protected]
>> <mailto:[email protected]>> 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.
>>
