On Thu, Oct 18, 2018 at 3:35 PM Florent B <florent@xxxxxxxxxxx> wrote: > > I'm not familiar with gdb, what do I need to do ? Install "-gdb" version > of ceph-mds package ? Then ? > Thank you > install ceph with debug info, install gdb. run 'gdb attach <pid of ceph-mds>' > On 18/10/2018 03:40, Yan, Zheng wrote: > > On Thu, Oct 18, 2018 at 3:59 AM Florent B <florent@xxxxxxxxxxx> wrote: > >> Hi, > >> I'm not running multiple active MDS (1 active & 7 standby). > >> I know about debug_mds 20, is it the only log you need to see bugs ? > >> > >> On 16/10/2018 18:32, Sergey Malinin wrote: > >>> Are you running multiple active MDS daemons? > >>> On MDS host issue "ceph-daemon mds.X config set debug_mds 20" for maximum logging verbosity. > >>> > >>>> On 16.10.2018, at 19:23, Florent B <florent@xxxxxxxxxxx> wrote: > >>>> > >>>> Hi, > >>>> > >>>> A few months ago I sent a message to that list about a problem with a > >>>> Ceph + Dovecot setup. > >>>> > >>>> Bug disappeared and I didn't answer to the thread. > >>>> > >>>> Now the bug has come again (Luminous up-to-date cluster + Dovecot > >>>> up-to-date + Debian Stretch up-to-date). > >>>> > >>>> I know how to reproduce it, but it seems very related to my user's > >>>> Dovecot data (few GB) and is related to file locking system (bug occurs > >>>> when I set locking method to "fcntl" or "flock" in Dovecot, but not with > >>>> "dotlock". > >>>> > >>>> It ends to a unresponsive MDS (100% CPU hang, switching to another MDS > >>>> but always staying at 100% CPU usage). I can't even use the admin socket > >>>> when MDS is hanged. > >>>> > > For issue like this, gdb is the most convenient way to debug. After > > finding where the buggy code is, set debug_mds=20 and restart mds, > > check the log to find how the bug was triggered. > > > > Regards > > Yan, Zheng > > > > > >>>> I would like to know *exactly* which information do you need to > >>>> investigate that bug ? (which commands, when, how to report large log > >>>> files...) > >>>> > >>>> Thank you. > >>>> > >>>> Florent > >>>> > >>>> > >>>> _______________________________________________ > >>>> ceph-users mailing list > >>>> ceph-users@xxxxxxxxxxxxxx > >>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >>> _______________________________________________ > >>> ceph-users mailing list > >>> ceph-users@xxxxxxxxxxxxxx > >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >> > >> _______________________________________________ > >> ceph-users mailing list > >> ceph-users@xxxxxxxxxxxxxx > >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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