[PATCH 0/4 v4] bfq: Avoid use-after-free when moving processes between cgroups

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Hello,

here is the third version of my patches to fix use-after-free issues in BFQ
when processes with merged queues get moved to different cgroups. The patches
have survived some beating in my test VM, but so far I fail to reproduce the
original KASAN reports so testing from people who can reproduce them is most
welcome. Kuai, can you please give these patches a run in your setup? Thanks
a lot for your help with fixing this!

Changes since v3:
* Changed handling of bfq group move to handle the case when target of the
  merge has moved.

Changes since v2:
* Improved handling of bfq queue splitting on move between cgroups
* Removed broken change to bfq_put_cooperator()

Changes since v1:
* Added fix for bfq_put_cooperator()
* Added fix to handle move between cgroups in bfq_merge_bio()

								Honza
Previous versions:
Link: http://lore.kernel.org/r/20211223171425.3551-1-jack@xxxxxxx # v1
Link: http://lore.kernel.org/r/20220105143037.20542-1-jack@xxxxxxx # v2
Link: http://lore.kernel.org/r/20220112113529.6355-1-jack@xxxxxxx # v3



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