*** This bug is a duplicate of bug 1810998 ***
https://bugs.launchpad.net/bugs/1810998
This issue seems to occur with kernels > 4.10 and < v4.19
and got already fixed with applying two patches to bionic (and cosmic) in LP
1810998 - thx to Mauricio Faria de Oliveira.
Hence this bug here can be considered as done and I mark this bug as a
duplicate of LP 1810998.
** This bug has been marked a duplicate of bug 1810998
CPU hard lockup with rigorous writes to NVMe drive
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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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