II13317: POTENTIAL SHELL & UTILITIES COMMAND PROBLEMS WHEN THE FILE SYSTEM CONTAINING /TMP FILLS UP

APAR status

• INTRAN

Error description

• When the filesystem containing the temporary directory (i.e.
  /tmp or the directory pointed to by TMP, TMPDIR etc. ) is
  full, there may be unexpected results from Shell & Utilities
  commands, with no indication that the /tmp is full. These
  commands will fail because they create a temporary file in /tmp
  as a part of their processing.
  Known issues include (but not limited to) the following:
  - cron loops when ENOSPC x'85' is issued while attempting to
    create a temporary file in /tmp, also issues message EDC5133I.
  - Shell commands that use command substitution return no output
    or error message, for example:
    /u/user1: >echo $(uname -n)
    /u/user1: >
  - Shell commands that redirect output to any HFS that is full
    will return with no indication of failure but still fail to
    produce any output. In the example below, myfile1 is empty
    as it was located on an HFS that was full.A directory entry is
    created for the output of the redirection,even though no data
    is written to this new file.
    /u/user1: >ls -l > myfile1
    /u/user1: >cat myfile1
    /u/user1: >
  - When the more command reads stdin (such as from a pipe) no
    input is read and there is no error indication, for example:
    /u/user1: >ps -elf | more
    /u/user1: >
  .
  Usually errors that occur attempting to create a new temporary
  file, are detected and reported. However, failures to write
  user data to a temporary file may go undetected and result
  in situations similar to the ones described above.
  .
  We recommend monitoring the /tmp HFS and avoid letting it run
  out of space, for example:
  - Using the FSFULL mount parameter.
  - Periodically running the skulker shell script to remove files
    that are no longer needed.
  - APAR OW42542 may also be helpful as
    it implements writing messages to the logrec and console to
    indicate that the HFS is full.
  Please refer to the UNIX System Services Planning Manual
  section "The /tmp Directory" for more suggestions on
  managing the /tmp directory.
  -
  ADDITIONAL KEYWORDS:
  Out of Storage  Temporary File System  Exhausted
  

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels