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  1. Lustre
  2. LU-7422

incorrect ENOENT handling in mdt_intent_reint causes panic on client side

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    • 9223372036854775807

    Description

      In case of DISP_OPEN_CREATE client waits for valid fid value in reply when it_status == 0.
      When reint_open returns ENOENT fid is not set and client gets fid filled by 0. This may cause following panic:

      > LustreError: 19177:0:(llite_lib.c:2178:ll_prep_inode()) ASSERTION( fid_is_sane(&md.body->fid1) ) failed:
      > LustreError: 19177:0:(llite_lib.c:2178:ll_prep_inode()) LBUG
      > Pid: 19177, comm: cp
      > 
      > Call Trace:
      >  [<ffffffff81006109>] try_stack_unwind+0x169/0x1b0
      >  [<ffffffff81004b99>] dump_trace+0x89/0x440
      >  [<ffffffffa036b8c7>] libcfs_debug_dumpstack+0x57/0x80 [libcfs]
      >  [<ffffffffa036be27>] lbug_with_loc+0x47/0xc0 [libcfs]
      >  [<ffffffffa0a21184>] ll_prep_inode+0xc04/0xe40 [lustre]
      >  [<ffffffffa0a34721>] ll_create_nd+0x3d1/0xec0 [lustre]
      >  [<ffffffff81163fe9>] vfs_create+0xa9/0xf0
      >  [<ffffffff811646aa>] do_last+0x67a/0x7d0
      >  [<ffffffff81165358>] path_openat+0xc8/0x3d0
      >  [<ffffffff81165788>] do_filp_open+0x48/0xa0
      >  [<ffffffff8115651e>] do_sys_open+0x16e/0x240
      >  [<ffffffff81156630>] sys_open+0x20/0x30
      >  [<ffffffff815662eb>] system_call_fastpath+0x16/0x1b
      >  [<00007fc9c3726790>] 0x7fc9c3726790

      We faced the issue on DNE setup. For unknown reason(possibly failover) FLDB on master mdt didn't include OST seq ranges.
      We faced above panic every time after trying to create regular file in directory located on mdt1.

      Attachments

        1. soak.log.bz2
          358 kB
        2. messages-lola-29.log.bz2
          409 kB
        3. messages-lola-10.log.bz2
          445 kB
        4. lola-29-lustre-log.1448526588.65535.bz2
          0.3 kB
        5. console-lola-29.log.bz2
          44 kB
        6. console-lola-10.log.bz2
          386 kB

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              wc-triage WC Triage
              scherementsev Sergey Cheremencev
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                Created:
                Updated:
                Resolved: