RHEL6: Applications or Tools Hang on ext4 Filesystem

Solution Verified - Updated -


  • Filesystem deadlock due to delayed allocation unable to allocate disk space
    • sysreq c must be used (or the system rebooted) to recover control
  • File system commands hang or fail to complete
    • Hung commands appear as blocked in ps or top
  • Application hangs and can not be killed (even with kill -9 <pid>)
  • service <application> start|stop|restart commands fail to complete


  • Red Hat Enterprise Linux 6.5
  • Red Hat Enterprise Linux 6.4
  • Red Hat Enterprise Linux 6.3
  • Red Hat Enterprise Linux 6.2
  • ext4 filesystem

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