[Bug 1892915] Re: gnome-shell crashing (libffi8ubuntu1 upgrade issue)

[Steve Langasek]

I see that the libffi transition in -proposed is as-yet incomplete.  So
one possible explanation for the crash would be if pointers to libffi
objects are being passed between other libraries that are linked to
different versions of libffi, resulting in a crash.

 #if defined (X86_64) || defined(X86_WIN64) \
     || (defined (__x86_64__) && defined (X86_DARWIN))
-# define FFI_TRAMPOLINE_SIZE 24
+/* 4 bytes of ENDBR64 + 7 bytes of LEA + 6 bytes of JMP + 7 bytes of NOP
+   + 8 bytes of pointer.  */
+# define FFI_TRAMPOLINE_SIZE 32
 # define FFI_NATIVE_RAW_API 0
 #else
-# define FFI_TRAMPOLINE_SIZE 12
+/* 4 bytes of ENDBR32 + 5 bytes of MOV + 5 bytes of JMP + 2 unused
+   bytes.  */
+# define FFI_TRAMPOLINE_SIZE 16
 # define FFI_NATIVE_RAW_API 1  /* x86 has native raw api support */
 #endif

There are definitely libffi structures that have changed size between
releases.

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https://bugs.launchpad.net/bugs/1892915

Title:
  gnome-shell crashing (libffi8ubuntu1 upgrade issue)

Status in gnome-shell package in Ubuntu:
  Incomplete
Status in libffi package in Ubuntu:
  Incomplete

Bug description:
  Seeing this on groovy installs after an update.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: gnome-shell 3.36.4-1ubuntu2~build1
  Uname: Linux 5.8.3-050803-generic x86_64
  ApportVersion: 2.20.11-0ubuntu44
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Aug 25 15:49:17 2020
  DisplayManager: gdm3
  InstallationDate: Installed on 2019-10-19 (311 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: mutter-common 3.36.4-1ubuntu2
  ShellJournal:
   -- Logs begin at Tue 2020-06-16 11:50:01 EDT, end at Tue 2020-08-25 15:49:37 EDT. --
   -- No entries --
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport: [modified]
  mtime.conffile..etc.default.apport: 2020-08-10T16:14:34.416087

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