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An unprivileged user can cause an MDS LBUG by issuing "chmod +x /mnt/lustre/.lustre/fid". Similarly root can cause an LBUG by issuing

{get,set}

facl calls against this directory. Privileged users cannot changes the attributes of /mnt/lustre/.lustre.

is related to

LU-1777 open-by-fid: deadlock in lock_rename()

LU-2780 Use real inode for .lustre/fid

LU-1549 open-unlinked files are accessible through the PENDING directory

LU-1550 open-by-fid getdents may return inconsistend data

LU-1553 inaccessible files in .lustre

LU-1552 opening lost+found: triggers (mdt_open.c:784:mdt_finish_open()) ASSERTION( ma->ma_valid & MA_INODE ) failed:

is related to

LU-1532 only allow FID_SEQ_NORMAL from clients

LU-1531 Accessing .lustre/fid/[0x1:0x0:0x0] triggers LBUG in osd_compat_objid_lookup()

(1 is related to, 2 is related to )