[Bug 2008755] [NEW] [SRU] Upgrade to 15.0.7 on Kinetic and Jammy

[Zixing Liu]

Public bug reported:

[ Impact ]

 * LLVM 15 version 15.0.7 fixed an issue where in certain cases, the
LLVM register allocator would trigger an assertion error (or an abort()
in the release build) on ppc64el during the RTL phase.

[ Test Plan ]

 * Building Rust 1.65 or above can reproduce this issue. See https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.66/+build/25610577.
 * Or run `llc -O0` on this sample: https://github.com/llvm/llvm-project/files/10078103/reduced.ll.txt.

[ Where problems could occur ]

 * The problems may occur through LLVM optimizer crashes or IR lowering
issues.

 * The risk of other severe issues occurring in the 15.0.7 is relatively
low since LLVM upstream should have done their testing before release.

 * LLVM 15 is currently only used by the HWE stack in JJ and KK, so a
rebuild test for the HWE stack should suffice, in addition to the tests
included by Rust.

[ Other Info ]

 * Upstream bug report: https://github.com/llvm/llvm-
project/issues/59172

** Affects: llvm-toolchain-15 (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  [ Impact ]
  
-  * LLVM 15 version 15.0.7 fixed an issue where in certain cases, the
+  * LLVM 15 version 15.0.7 fixed an issue where in certain cases, the
  LLVM register allocator would trigger an assertion error (or an abort()
  in the release build) on ppc64el during the RTL phase.
  
  [ Test Plan ]
  
-  * Building Rust 1.65 or above can reproduce this issue. See
- https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-
- updates-1.66/+build/25610577.
+  * Building Rust 1.65 or above can reproduce this issue. See https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.66/+build/25610577.
+  * Or run `llc -O0` on this sample: https://github.com/llvm/llvm-project/files/10078103/reduced.ll.txt.
  
  [ Where problems could occur ]
  
-  * The problems may occur through LLVM optimizer crashes or IR lowering
+  * The problems may occur through LLVM optimizer crashes or IR lowering
  issues.
  
-  * The risk of other severe issues occurring in the 15.0.7 is relatively
+  * The risk of other severe issues occurring in the 15.0.7 is relatively
  low since LLVM upstream should have done their testing before release.
  
-  * LLVM 15 is currently only used by the HWE stack in JJ and KK, so a
+  * LLVM 15 is currently only used by the HWE stack in JJ and KK, so a
  rebuild test for the HWE stack should suffice, in addition to the tests
  included by Rust.
  
  [ Other Info ]
-  
-  * Upstream bug report: https://github.com/llvm/llvm-project/issues/59172
+ 
+  * Upstream bug report: https://github.com/llvm/llvm-
+ project/issues/59172

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https://bugs.launchpad.net/bugs/2008755

Title:
  [SRU] Upgrade to 15.0.7 on Kinetic and Jammy

Status in llvm-toolchain-15 package in Ubuntu:
  New

Bug description:
  [ Impact ]

   * LLVM 15 version 15.0.7 fixed an issue where in certain cases, the
  LLVM register allocator would trigger an assertion error (or an
  abort() in the release build) on ppc64el during the RTL phase.

  [ Test Plan ]

   * Building Rust 1.65 or above can reproduce this issue. See https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.66/+build/25610577.
   * Or run `llc -O0` on this sample: https://github.com/llvm/llvm-project/files/10078103/reduced.ll.txt.

  [ Where problems could occur ]

   * The problems may occur through LLVM optimizer crashes or IR
  lowering issues.

   * The risk of other severe issues occurring in the 15.0.7 is
  relatively low since LLVM upstream should have done their testing
  before release.

   * LLVM 15 is currently only used by the HWE stack in JJ and KK, so a
  rebuild test for the HWE stack should suffice, in addition to the
  tests included by Rust.

  [ Other Info ]

   * Upstream bug report: https://github.com/llvm/llvm-
  project/issues/59172

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