I'm not familiar with gdb, what do I need to do ? Install "-gdb" version of ceph-mds package ? Then ? Thank you 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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