Russell, Your symptoms are a little different from what I see when the MDS node's passwd file is incomplete, but did you verify the affected_user has a proper /etc/passwd entry on the MDS node(s)?
On 1/10/19 12:14 PM, Russell Dekema wrote: > We've got a Lustre system running lustre-2.5.42.28.ddn8 and are having > a problem with it that none of us here have ever seen before. We are > wondering if anyone here has seen this or has any idea what might be > causing it. > > (I have redacted the example affected username and its corresponding > UID in this message for privacy reasons, and replaced them with the > strings 'affected_username' and 'uid_of_the_affected_username'.) > > Of the 4,463 UIDs on our system, there are 24 UIDs for which Lustre > returns an error when those UIDs are used as the owner of files in a > chown or create operation, as in: > > # chown affected_username testfile > chown: changing ownership of ‘testfile’: No such process > > This occurs both when root tries to chown a file for the affected UID > and when the user corresponding to that UID tries to create a file in > a directory to which they otherwise have the proper permissions. > > If, as root, we run "strace chown affected_username testfile", the > system call that fails appears to be: > > fchownat(AT_FDCWD, "testfile", uid_of_the_affected_username, -1, 0) = > -1 ESRCH (No such process) > > Another unusual thing we have noticed about these users is that we are > unable to look up their quotas on the Lustre filesystem, even though > quota lookups work fine for other users: > > $ sudo lfs quota -u affected_username /scratch > usr quotas are not enabled. > > If anyone has any ideas about what might be causing this or what we > might try in order to fix or further diagnose it, I'll be glad to hear > them. We do have a ticket open with our vendor but wanted to see if > anyone else had heard of this while we await their response. > > Sincerely, > Rusty Dekema > University of Michigan > Advanced Research Computing - Technology Services > _______________________________________________ > lustre-discuss mailing list > [email protected] > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
