[Ocfs2-users] Weird lock

[Nuno Fernandes]

Hello,

yes.. when this situation happens there is allways a process spinning (running 
at 100%cpu). We can't kill it even with kill -9

Kernel = 2.6.9-48.ELxenU
OCFS2 = 1.2.5

OCFS2 Node Manager 1.2.5 Tue Apr 10 12:29:33 EDT 2007 (build 
9e5f332181e8ebfad464946bcc4888af)
OCFS2 DLM 1.2.5 Tue Apr 10 12:29:33 EDT 2007 (build 
e2556a71429f31033b275dff4b5594aa)
OCFS2 DLMFS 1.2.5 Tue Apr 10 12:29:33 EDT 2007 (build 
e2556a71429f31033b275dff4b5594aa)

Thanks for any info,
Nuno Fernandes

On Monday 07 April 2008 18:17:09 Sunil Mushran wrote:
> Are any processes spinning during this time?
> As in, does top show any process eating up cpu.
>
> The said hangs are in the generic layer and could be due to a
> spinning process not releasing a lock. I can see some processes
> in R state but can't say for sure that they are spinning or not.
>
> ocfs2/kernel versions?
>
> Sunil
>
> Nuno Fernandes wrote:
> > Hello,
> >
> > The sysrq is attached.
> >
> > The processlist is:
> >
> > ...
> > 17280 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 6373 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 16561 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 6380 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 17093 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 7649 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 16566 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 7772 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 17829 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 7905 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 17233 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 7924 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 16477 ?        R    343:20  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 7986 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 16565 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 8007 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 30015 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 8066 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 17236 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi 8070 ?  
> >      S      0:00  \_ /usr/sbin/httpd
> > 16480 ?        D      0:00  |
> > \_ /usr/bin/perl -w
> > /storage/webhosting/site/public_html/alojados/site/MT/come2x.cgi ...
> >
> > Thanks for any info,
> > Best regards,
> > Nuno Fernandes
> >
> > On Friday 04 April 2008 19:21:05 Sunil Mushran wrote:
> >> No busy locks. The hang is not because of o2dlm.
> >>
> >> Do a kernel stack dump. echo t >/proc/sysrq-trigger
> >> That should tell us where the process is stuck in the kernel.
> >>
> >> Nuno Fernandes wrote:
> >>> On Friday 04 April 2008 18:40:42 Sunil Mushran wrote:
> >>>> debugfs.ocfs2 -R "fs_locks" /dev/sdX >/tmp/out
> >>>
> >>> Hi,
> >>>
> >>> I happened again. Attached i send the output.
> >>>
> >>> Thanks for any info,
> >>> Best regards,
> >>> Nuno Fernandes
> >>>
> >>> -----------------------------------------------------------------------
> >>>-
> >>>
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> >
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