We are seeing periodic resource temporarily unavailable errors on our cifs mounts. An example: svnadmin: E000011: Can't open file '/cifs/mount/...': Resource temporarily unavailable At the same time a (successful cifs.upcall message is generated: May 12 03:20:31 client cifs.upcall[47418]: key description: cifs.spnego;0;0;39010000;ver=0x2;host=server;ip4=X.X.X.X;sec=krb5;uid=0x0;creduid=0x77f9;user=root;pid=0xb924 May 12 03:20:31 client cifs.upcall[47418]: ver=2 May 12 03:20:31 client cifs.upcall[47418]: host=server May 12 03:20:31 client cifs.upcall[47418]: ip=X.X.X.X May 12 03:20:31 client cifs.upcall[47418]: sec=1 May 12 03:20:31 client cifs.upcall[47418]: uid=0 May 12 03:20:31 client cifs.upcall[47418]: creduid=30713 May 12 03:20:31 client cifs.upcall[47418]: user=root May 12 03:20:31 client cifs.upcall[47418]: pid=47396 May 12 03:20:31 client cifs.upcall[47418]: get_cachename_from_process_env: pathname=/proc/47396/environ May 12 03:20:31 client cifs.upcall[47418]: get_existing_cc: default ccache is KEYRING:persistent:30713:30713 May 12 03:20:31 client cifs.upcall[47418]: handle_krb5_mech: getting service ticket for server May 12 03:20:31 client cifs.upcall[47418]: handle_krb5_mech: obtained service ticket May 12 03:20:31 client cifs.upcall[47418]: Exit status 0 In this case it occurred about 65 minutes after the initial mount. Client is Fedora 31, kernel 5.6.8-200 //server/backup on /cifs/mount type cifs (rw,relatime,vers=3.1.1,sec=krb5,cruid=30713,cache=strict,multiuser,uid=0,noforceuid,gid=0,noforcegid,addr=X.X.X.X,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,nobrl,noperm,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1) Also seen with CentOS 7.8 client, same server. Server is a Synology NAS. samba isn't logging much there so hard to tell what might have happened on the server side. Is there any way to prevent this? Preemptive service ticket renewal? Thanks, Orion -- Orion Poplawski Manager of NWRA Technical Systems 720-772-5637 NWRA, Boulder/CoRA Office FAX: 303-415-9702 3380 Mitchell Lane orion@xxxxxxxx Boulder, CO 80301 https://www.nwra.com/
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