This issue is already fixed in the Cosmic kernel (which means that "D"
is also fixed). The Bionic kernel needs these patches:
db7ddef301128dad394f1c0f77027f86ee9a4edb ("mm: move tlb_table_flush to
tlb_flush_mmu_free")
a6f572084fbee8b30f91465f4a085d7a90901c57 ("mm/tlb: Remove tlb_remove_table()
non-concurrent condition")
d86564a2f085b79ec046a5cba90188e612352806 ("mm/tlb, x86/mm: Support invalidating
TLB caches for RCU_TABLE_FREE")
Older releases are not affected.
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https://bugs.launchpad.net/bugs/1798897
Title:
Linux: insufficient shootdown for paging-structure caches
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