Public bug reported:

Machine is a MacBook with intel graphics.
After installing unity8-greeter and rebooting all I get is a black screen and 
this core dump. I've heard this from other people too by now so it doesn't seem 
to be my machine only.

#0  0x00007f483d554428 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007f483d55602a in __GI_abort () at abort.c:89
#2  0x00007f483d5967ea in __libc_message (do_abort=do_abort@entry=2, 
fmt=fmt@entry=0x7f483d6af2e0 "*** Error in `%s': %s: 0x%s ***\n") at 
../sysdeps/posix/libc_fatal.c:175
#3  0x00007f483d59ee0a in malloc_printerr (ar_ptr=<optimized out>, 
ptr=<optimized out>, str=0x7f483d6ac0ca "free(): invalid size", action=3) at 
malloc.c:5004
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at 
malloc.c:3865
#5  0x00007f483d5a298c in __GI___libc_free (mem=<optimized out>) at 
malloc.c:2966
#6  0x00007f47faafb901 in 
google::protobuf::internal::DestroyDefaultRepeatedFields() () from 
/usr/lib/x86_64-linux-gnu/libprotobuf.so.9
#7  0x00007f483320f72b in google::protobuf::ShutdownProtobufLibrary() () from 
/usr/lib/x86_64-linux-gnu/libprotobuf-lite.so.9
#8  0x00007f48338df0d9 in ?? () from 
/usr/lib/x86_64-linux-gnu/libmirprotobuf.so.3
#9  0x00007f483fc0bc17 in _dl_fini () at dl-fini.c:235
#10 0x00007f483d558ff8 in __run_exit_handlers (status=0, listp=0x7f483d8e25f8 
<__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
#11 0x00007f483d559045 in __GI_exit (status=<optimized out>) at exit.c:104
#12 0x00007f483d53f837 in __libc_start_main (main=0x4077e0, argc=2, 
argv=0x7ffd3ee9bab8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffd3ee9baa8)
    at ../csu/libc-start.c:325
#13 0x0000000000407bd9 in _start ()

** Affects: mir (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: unity8 (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Also affects: mir (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

+ Machine is a MacBook with intel graphics.
+ After installing unity8-greeter and rebooting all I get is a black screen and 
this core dump:
+ 
  #0  0x00007f483d554428 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:54
  #1  0x00007f483d55602a in __GI_abort () at abort.c:89
  #2  0x00007f483d5967ea in __libc_message (do_abort=do_abort@entry=2, 
fmt=fmt@entry=0x7f483d6af2e0 "*** Error in `%s': %s: 0x%s ***\n") at 
../sysdeps/posix/libc_fatal.c:175
  #3  0x00007f483d59ee0a in malloc_printerr (ar_ptr=<optimized out>, 
ptr=<optimized out>, str=0x7f483d6ac0ca "free(): invalid size", action=3) at 
malloc.c:5004
  #4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at 
malloc.c:3865
  #5  0x00007f483d5a298c in __GI___libc_free (mem=<optimized out>) at 
malloc.c:2966
  #6  0x00007f47faafb901 in 
google::protobuf::internal::DestroyDefaultRepeatedFields() () from 
/usr/lib/x86_64-linux-gnu/libprotobuf.so.9
  #7  0x00007f483320f72b in google::protobuf::ShutdownProtobufLibrary() () from 
/usr/lib/x86_64-linux-gnu/libprotobuf-lite.so.9
  #8  0x00007f48338df0d9 in ?? () from 
/usr/lib/x86_64-linux-gnu/libmirprotobuf.so.3
  #9  0x00007f483fc0bc17 in _dl_fini () at dl-fini.c:235
  #10 0x00007f483d558ff8 in __run_exit_handlers (status=0, listp=0x7f483d8e25f8 
<__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
  #11 0x00007f483d559045 in __GI_exit (status=<optimized out>) at exit.c:104
  #12 0x00007f483d53f837 in __libc_start_main (main=0x4077e0, argc=2, 
argv=0x7ffd3ee9bab8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffd3ee9baa8)
-     at ../csu/libc-start.c:325
+     at ../csu/libc-start.c:325
  #13 0x0000000000407bd9 in _start ()

** Description changed:

  Machine is a MacBook with intel graphics.
- After installing unity8-greeter and rebooting all I get is a black screen and 
this core dump:
+ After installing unity8-greeter and rebooting all I get is a black screen and 
this core dump. I've heard this from other people too by now so it doesn't seem 
to be my machine only.
  
  #0  0x00007f483d554428 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:54
  #1  0x00007f483d55602a in __GI_abort () at abort.c:89
  #2  0x00007f483d5967ea in __libc_message (do_abort=do_abort@entry=2, 
fmt=fmt@entry=0x7f483d6af2e0 "*** Error in `%s': %s: 0x%s ***\n") at 
../sysdeps/posix/libc_fatal.c:175
  #3  0x00007f483d59ee0a in malloc_printerr (ar_ptr=<optimized out>, 
ptr=<optimized out>, str=0x7f483d6ac0ca "free(): invalid size", action=3) at 
malloc.c:5004
  #4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at 
malloc.c:3865
  #5  0x00007f483d5a298c in __GI___libc_free (mem=<optimized out>) at 
malloc.c:2966
  #6  0x00007f47faafb901 in 
google::protobuf::internal::DestroyDefaultRepeatedFields() () from 
/usr/lib/x86_64-linux-gnu/libprotobuf.so.9
  #7  0x00007f483320f72b in google::protobuf::ShutdownProtobufLibrary() () from 
/usr/lib/x86_64-linux-gnu/libprotobuf-lite.so.9
  #8  0x00007f48338df0d9 in ?? () from 
/usr/lib/x86_64-linux-gnu/libmirprotobuf.so.3
  #9  0x00007f483fc0bc17 in _dl_fini () at dl-fini.c:235
  #10 0x00007f483d558ff8 in __run_exit_handlers (status=0, listp=0x7f483d8e25f8 
<__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
  #11 0x00007f483d559045 in __GI_exit (status=<optimized out>) at exit.c:104
  #12 0x00007f483d53f837 in __libc_start_main (main=0x4077e0, argc=2, 
argv=0x7ffd3ee9bab8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffd3ee9baa8)
      at ../csu/libc-start.c:325
  #13 0x0000000000407bd9 in _start ()

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https://bugs.launchpad.net/bugs/1655052

Title:
  unity8-greeter aborts at start in libprotobuf

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