group.of.nepali.translators team mailing list archive

[Frank Heimes <1801686@xxxxxxxxxxxxxxxxxx>]

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1801686

Title:
  [Ubuntu] qdio: reset old sbal_state flags

Status in Ubuntu on IBM z Systems:
  New
Status in linux package in Ubuntu:
  New
Status in linux source package in Xenial:
  New
Status in linux source package in Bionic:
  New
Status in linux source package in Cosmic:
  New
Status in linux source package in Disco:
  New

Bug description:
  Description:  qdio: reset old sbal_state flags

  Symptom:      af_iucv socket using HiperSockets may stall.

  Problem:      When allocating a new AOB fails, handle_outbound() is
                still capable of transmitting the selected buffer
                (just without async completion).
                But if a previous transfer on this queue slot used
                async completion, its sbal_state flags field is still set
                to QDIO_OUTBUF_STATE_FLAG_PENDING.
                So when the upper layer driver sees this stale flag, it
                expects an async completion that never happens.

  Solution:     Unconditionally clear the buffer's flags field.

  Reproduction: Error inject, simulating out-of-memory.

  kernel 4.20
  Upstream-ID:  64e03ff72623b8c2ea89ca3cb660094e019ed4ae

  Canonical , please provide this fix for all Releases in Service....
  Ubuntu 18.10, 18.04 and 16.04

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