** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Triaged
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => High
** Tags added: kernel-da-key
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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
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Bionic:
Triaged
Bug description:
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.
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