On RHEL5, zsh may hang when re-using PIDs

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 5
  • zsh 4.2.6-2 and older

Issue

On RHEL5, zsh may hang when re-using PIDs

Resolution

Please upgrade zsh to version 4.2.6-3 provided in RHBA-2009-0463.

Root Cause

It may happen that with many processes one PID may appear in zsh's job table twice, one marked as done.  In such a case zsh may not be able to pick the other process and mark it as done and would wait for it to finish forever. This would cause the zsh scripts to hang.

Diagnostic Steps

Please review Bugzilla #465455.

  • Component
  • zsh

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