Public bug reported:

[ Impact ]
When UBSAN is enabled, multiple array-index-out-of-bounds messages are
printed:

  [    0.000000] [     T0] UBSAN: array-index-out-of-bounds in 
arch/x86/kernel/apic/x2apic_uv_x.c:276:23
  [    0.000000] [     T0] index 1 is out of range for type '<unknown> [1]'
  ...
  [    0.000000] [     T0] UBSAN: array-index-out-of-bounds in 
arch/x86/kernel/apic/x2apic_uv_x.c:277:32
  [    0.000000] [     T0] index 1 is out of range for type '<unknown> [1]'
  ...
  [    0.000000] [     T0] UBSAN: array-index-out-of-bounds in 
arch/x86/kernel/apic/x2apic_uv_x.c:282:16
  [    0.000000] [     T0] index 1 is out of range for type '<unknown> [1]'
  ...
  [    0.515850] [     T1] UBSAN: array-index-out-of-bounds in 
arch/x86/kernel/apic/x2apic_uv_x.c:1344:23
  [    0.519851] [     T1] index 1 is out of range for type '<unknown> [1]'
  ...
  [    0.603850] [     T1] UBSAN: array-index-out-of-bounds in 
arch/x86/kernel/apic/x2apic_uv_x.c:1345:32
  [    0.607850] [     T1] index 1 is out of range for type '<unknown> [1]'
  ...
  [    0.691850] [     T1] UBSAN: array-index-out-of-bounds in 
arch/x86/kernel/apic/x2apic_uv_x.c:1353:20
  [    0.695850] [     T1] index 1 is out of range for type '<unknown> [1]'

One-element arrays have been deprecated:

[ Fix ]

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=21433d3e3ca14d20f9b0c2237b3d3a1355af7907

[ Test Plan ]

[ Where problems could occur ]

[ Other Info ]

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2161004

Title:
  [SRU] HPE:  Fix for UBSAN array-index-out-of-bounds

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