Today we had a problem with one of our Natural FUsers. When trying to add new sources with ftouch, we got the following error message:
user@server ~ $ ftouch fuser=22,173 lib=ACC sm -b -d
FTOUCH UTILITY V 6.3.13 PL 0 Software AG 2012
Error : Mass update could not be started.
Return code 82 received.
As the return code didn’t help with finding a solution, I kicked off strace and followed the output until the error message was shown:
strace -f -v -s 2014 -o /tmp/stracelog.txt ftouch fuser=22,173 lib=ACC sm -b -d
- -f: Trace child processes as they are created by currently traced processes as a result of the fork(2) system call.
- -v: Print unabbreviated versions of environment, stat, termios, etc. calls.
- -s strsize: Specify the maximum string size to print (the default is 32).
- -o filename: Write the trace output to the file filename rather than to stderr.
Here comes the interesting part:
stat("/home/macke/fuser", {st_dev=makedev(253, 2), st_ino=2007056, st_mode=S_IFDIR|S_ISGID|0775, st_nlink=4, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=8, st_size=4096, st_atime=2015/06/02-12:14:40, st_mtime=2015/06/02-12:14:33, st_ctime=2015/06/02-12:14:39}) = 0
open("/tmp/NCFD00b30016.LCK", O_RDONLY) = 3
read(3, "B24B\0\0\0\0\1\0\0\0FD00b30016\0\0006\200\34\0\0\0\0\0", 32) = 32
close(3) = 0
semctl(1867830, 0, GETVAL, 0) = 0
semctl(1867830, 1, GETVAL, 0) = 9999
unlink("/home/macke/fuser/ACC/FILEDIR.SAG") = -1 ENOENT (No such file or directory)
semop(1867830, 0x7ffdbcb66ab0, 1) = -1 EACCES (Permission denied)
write(1, "Error : Mass update could not be started.\n", 43) = 43
write(1, " Return code 82 received.\n", 35) = 35
Apparently, after opening some kind of temporary file under /tmp, a system call to semop couldn’t be executed (see EACCES (Permission denied)).
Without searching for the cause any longer, I simply deleted all the temporary files under /tmp/NCFD* (who cares for temporary files, anyway?) and ftouch ran successfully immediately:
user@server ~ $ ftouch fuser=22,173 lib=ACC sm -b -d
FTOUCH UTILITY V 6.3.13 PL 0 Software AG 2012
Ftouch request executed with success.