** 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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