** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1780066
Title:
[Bionic] Disk IO hangs when using BFQ as io scheduler
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Bug description:
When BFQ is used, disk IO will hang some seconds after boot. This was
also reported in some public MLs [1][2]. The fix is already in
mainline, but it's not available in 4.15.
[1] https://lkml.org/lkml/2017/12/1/80
[2] https://groups.google.com/forum/#!topic/bfq-iosched/nB2cVfDMSOU
== SRU Justification ==
Impact:
Disk IO hangs several seconds after booting with a bionic Ubuntu kernel
Fix:
Three patches are cherry-picked for SRU. "block, bfq: add requeue-request
hook" is the fix, while the other two are cleanups and make the whole fixes
clean cherry-picks.
Testcase:
Boot the kernel with BFQ as IO scheduler.
Risk of Regression:
Clean cherry-picks from upstream so the risk should be fairly low.
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