Re: very large mount time after unxepected power down

[Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>]

On Thu, 2012-11-15 at 16:08 +0300, Сергей Александров wrote:
> lssu, lscp after mount. Actually I missed the moment and
> nilfs_cleanerd has cleaned some data.
> Mount took about 50 minutes.
> 

Thank you for info.

I have some additional questions after thinking about issue. As I
remember, you wrote that you tried to understand what process eats CPU
time during issue. But you don't share details about it. Could you share
details of "top" and "ps ax" outputs for the case of issue reproducing?

With the best regards,
Vyacheslav Dubeyko.

> --------------------------------------------------
> Александров Сергей Васильевич
> 
> 
> 2012/11/15 Сергей Александров <splavgm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> > 2012/11/15 Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>:
> >
> >>> The bug appeared again. And apparently it's a kernel one.
> >>> My bad that I didn't notice that the CPU activity wals in kernel space.
> >>> The mount process hangs inside mount call itself. I've an strace
> >>> output, but it's not informative, it perfectly normal besides the hang
> >>> in mount call.
> >>
> >> I will try to reproduce the issue. As I remember, you described your
> >> environment with details. But what size of files you have preferably on
> >> your partition? Moreover, could you share strace output anyway? Because
> >> it can be a basis for understanding of achieving the issue reproducing
> >> and analysis of execution environment.
> >
> > Essentially there are three kind of files: large ones about 700MB-2GB,
> > video, written by rtorrent/libtorrent (with no preallocation, if it
> > matters)and physics numerical simulation files - about 2GB data files
> > and few killobytes long description files.
> >
> >>
> >> If you want to try to investigate and fix the issue by yourself then
> >> your strace output is needed also.
> >>
> >> By the way, could you share your dmesg output for analysis?
> >
> > strace and dmesg output attached. Mount is in progress.
> >
> >>
> >> I think also it can be very useful lscp and lssu output before sudden
> >> power off and after mount is ended successfully. Could you share it?
> >
> > It will be a bit hard to get the before data, but when mount will be
> > finished I'll send you after results.
> >
> >
> > I'll try to reproduce and get the before results too, but I am not
> > sure about it.
> >
> >
> > Best regards,
> > Aleksandrov Sergey Vasil'evich


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