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  1. Lustre
  2. LU-1428

MDT servrice threads spinning in cfs_hash_for_each_relax()

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      We have two MDT service threads using 100% CPU on a production MDS. I can't get a backtrace from crash because they do not yield the CPU, but based on oprofile they seem to be spinning in cfs_hash_for_each_relax(). At the same time we are seeing client hangs and high lock cancellation rates on the OSTs.

      samples  %        image name               app name                 symbol name
4225020  33.0708  libcfs.ko                libcfs.ko                cfs_hash_for_each_relax
3345225  26.1843  libcfs.ko                libcfs.ko                cfs_hash_hh_hhead
532409    4.1674  ptlrpc.ko                ptlrpc.ko                ldlm_cancel_locks_for_export_cb
307199    2.4046  ptlrpc.ko                ptlrpc.ko                lock_res_and_lock
175349    1.3725  vmlinux                  vmlinux                  native_read_tsc
151989    1.1897  ptlrpc.ko                ptlrpc.ko                ldlm_del_waiting_lock
136679    1.0698  libcfs.ko                libcfs.ko                cfs_hash_rw_lock
109269    0.8553  jbd2.ko                  jbd2.ko                  journal_clean_one_cp_list

            liang Liang Zhen (Inactive)
            nedbass Ned Bass (Inactive)
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              Created:
              Updated:
              Resolved: