Re: problem with dnf

[Samuel Sieb]

On 09/08/2016 04:31 AM, Tom Horsley wrote:

On Thu, 08 Sep 2016 10:44:59 +0100
Timothy Murphy wrote:


I don't understand why dnf (and yum before it)
don't give any idea what is happening during this pause,
which as you say can be quite long.


I also often wonder what the heck it is doing during that
long pause. I see the CPU hit 100% while it is doing it,
but have no idea what might be going on in there.


It's RPM running all the postinst scripts, so depending on what those 
do, it can take a long time.  For example with kernel packages, it 
creates the initramfs using dracut.

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Re: problem with dnf

[Reynold DeMarco Jr]

Thank you all for you advice on this matter. I did wait for 35 minutes 
where the program finally executed to completion. I looked at cat 
/var/log/dnf.log but did not find an error but I do believe it is 
snapper that is causing the delay. I removed snapper and the program 
seems to execute within a few seconds but this was on an install with 
only a few packages. To regress, this was a fresh install of Fedora 24 
and during wildcard installs that would include tens to hundreds of 
packages the program would hang excessively. I don't believe this to be 
a bug but it is quite annoying


Reynold

On 09/08/2016 06:27 AM, maderios wrote:

On 09/08/2016 01:31 PM, Tom Horsley wrote:


I also often wonder what the heck it is doing during that
long pause. I see the CPU hit 100% while it is doing it,
but have no idea what might be going on in there.

You'll find answer doing
cat /var/log/dnf.log


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Re: problem with dnf

[Chris Murphy]

On Thu, Sep 8, 2016 at 7:27 AM, maderios  wrote:
> On 09/08/2016 01:31 PM, Tom Horsley wrote:
>
>> I also often wonder what the heck it is doing during that
>> long pause. I see the CPU hit 100% while it is doing it,
>> but have no idea what might be going on in there.
>
> You'll find answer doing
> cat /var/log/dnf.log

Unlikely.

So I just did a single rpm update (btrfs-progs, less than 1MiB) and
dnf hung for about 2 minutes between

  Cleanup : btrfs-progs-4.7.1-1.fc26.x86_64

and

  Verifying   : btrfs-progs-4.7.2-1.fc26.x86_64

I attached strace to the dnf pid and all I got was

wait4(20314,

It stayed there for the entire 1-2 minute hang and then I got a spew
of stuff, but also that line became


wait4(20314, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 20314
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20314,
si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
close(48)   = 0
unlink("/var/tmp/rpm-tmp.vAGW3L")   = 0
[...snip 1000+ lines...]

So it might not actually be dnf itself, maybe this calls for -ff -o to
get all child pids also straced and written to their own files. It may
be dnf is hung up waiting on something else, I have no idea.

But this is sorta new. There's always been a hang without a status of
what it's doing, but it's only been particularly long for bigger
updates. For a single rpm to have this long of a hang is unusual in my
experience.



-- 
Chris Murphy
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Re: problem with dnf

[maderios]

On 09/08/2016 01:31 PM, Tom Horsley wrote:


I also often wonder what the heck it is doing during that
long pause. I see the CPU hit 100% while it is doing it,
but have no idea what might be going on in there.

You'll find answer doing
cat /var/log/dnf.log

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Maderios
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Re: problem with dnf

[Tom Horsley]

On Thu, 08 Sep 2016 10:44:59 +0100
Timothy Murphy wrote:

> I don't understand why dnf (and yum before it)
> don't give any idea what is happening during this pause,
> which as you say can be quite long.

I also often wonder what the heck it is doing during that
long pause. I see the CPU hit 100% while it is doing it,
but have no idea what might be going on in there.
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Re: problem with dnf

[Timothy Murphy]

stan wrote:

> How long are you waiting?  dnf does some sort of checks after the
> transaction is over, and those can take quite a while.  Wait at least
> 10 or 20 minutes. 

I don't understand why dnf (and yum before it)
don't give any idea what is happening during this pause,
which as you say can be quite long.

-- 
Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin

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Re: problem with dnf

[Chris Murphy]

You could run strace dnf install, and capture the hanging part to attach to
a bug report.

You could first do a dnf clean all. It's sort of a hammer but...


Chris Murphy
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Re: problem with dnf

[stan]

On Wed, 7 Sep 2016 15:49:41 -0700
Reynold DeMarco Jr  wrote:

> When I run an install with dnf the program downloads the packages
> runs through transaction checks and begins the installation. When it
> is done with the installation it just freezes. In the past it would
> run through a verification and clean up and then return to command
> prompt. Any ideas on correcting this situation would be appreciated.

How long are you waiting?  dnf does some sort of checks after the
transaction is over, and those can take quite a while.  Wait at least
10 or 20 minutes.  You could also try using the option --noplugins to
ensure that plugins checking things aren't causing the problem.

e.g. dnf --noplugins update

What does ps alx | grep dnf show as status for dnf when it seems to be
frozen?
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