Public bug reported:
User reports a hang under heavy I/O:
The IO hang problem on our cloud is caused by IO hang in block-wbt wbt_wait.
The fix commit id is 2887e41b910bb14fd847cf01ab7a5993db989d88. It is a block
write buffer throttle queue lock contention and thundering herd issue in
wbt_wait()
We can recreate the problem easily by running concurrent IO from
multiple VMs with sequential write. We can provide fio workload as
needed for recreate.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1805693
Title:
User reports a hang on 18.04 LTS(4.15.18) under a heavy I/O load
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