[Bug 2044899] [NEW] spurious crashes when compiling openjdk-21 in focal

[Vladimir Petko]

Public bug reported:

When compiling openjdk-21 in focal on risc-V, the gcc compiler spuriously crashes with SIGSEGV.
The crash happens with different files, and running the failing command in isolation succeeds.

The failing build logs[1].

The crash can be reproduced locally in RISC-V vm:
---
riscv64-linux-gnu-g++-9: internal compiler error: Segmentation fault signal terminated program cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.
---
It has the following backtrace:

#0  0x0000000000a77d1a in linemap_lookup(line_maps*, unsigned int) ()

#1  0x0000000000a78370 in linemap_resolve_location(line_maps, unsigned int, location_resolution_kind, line_map_ordinary const*) ()
Backtrace stopped: frame did not save the PC

[1]https://launchpadlibrarian.net/699320896/buildlog_ubuntu-focal-
riscv64.openjdk-21_21.0.1+12-2~20.04_BUILDING.txt.gz

Note: the build succeeds when build with -security pocket only

** Affects: gcc-9 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2044899

Title:
  spurious crashes when compiling openjdk-21 in focal

Status in gcc-9 package in Ubuntu:
  New

Bug description:
  When compiling openjdk-21 in focal on risc-V, the gcc compiler spuriously crashes with SIGSEGV.
  The crash happens with different files, and running the failing command in isolation succeeds.

  The failing build logs[1].

  The crash can be reproduced locally in RISC-V vm:
  ---
  riscv64-linux-gnu-g++-9: internal compiler error: Segmentation fault signal terminated program cc1plus
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.
  ---
  It has the following backtrace:

  #0  0x0000000000a77d1a in linemap_lookup(line_maps*, unsigned int) ()

  #1  0x0000000000a78370 in linemap_resolve_location(line_maps, unsigned int, location_resolution_kind, line_map_ordinary const*) ()
  Backtrace stopped: frame did not save the PC

  [1]https://launchpadlibrarian.net/699320896/buildlog_ubuntu-focal-
  riscv64.openjdk-21_21.0.1+12-2~20.04_BUILDING.txt.gz

  Note: the build succeeds when build with -security pocket only

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