Unkillable processes in state D when all paths to a volume are down

This document (7001880) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 10
SUSE Linux Enterprise Server 9


Processes waiting for I/O (i.e., processes in state D) don't get killed with 'kill SIGKILL' when all the paths to the LUN are down, to which the I/O process is writing to.   The device mapper is configured to use the 'queue_if_no_path' option for multipathed volumes.


The 'queue_if_no_path' device mapper setting causes the kernel to wait indefinitely for I/O operations to complete, even when all pathes to a volume are gone. Subsequently, all processes accessing the LUN are not killable and remain in state 'D' until the volume returns.

The device mapper can be set to return an I/O error in case a volume becomes unreachable with  the command
'dmsetup message DEVICE_NAME 0 fail_if_no_path' (replace DEVICE_NAME with the device name of the volume.)


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  • Document ID:7001880
  • Creation Date: 14-Nov-2008
  • Modified Date:19-Mar-2021
    • SUSE Linux Enterprise Server

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