[Pkg-shadow-devel] Bug#756630: Bug#756630: newusers fails adding multiple users

[James Collier]

As requested:
$  file /usr/sbin/newusers
/usr/sbin/newusers: ELF 64-bit LSB shared object, x86-64, version 1 
(SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for 
GNU/Linux 2.6.32, 
BuildID[sha1]=7dffe9a6fe6e2d86a9181e9928d8baea6b389c78, stripped
...
(gdb) run newusers
Starting program: /usr/sbin/newusers newusers
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
*** Error in `/usr/sbin/newusers': double free or corruption (!prev): 
0x00005555557812e0 ***

Program received signal SIGABRT, Aborted.
0x00007ffff71f6067 in __GI_raise (sig=sig at entry=6) at 
../nptl/sysdeps/unix/sysv/linux/raise.c:56
56    ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007ffff71f6067 in __GI_raise (sig=sig at entry=6) at 
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007ffff71f7448 in __GI_abort () at abort.c:89
#2  0x00007ffff72341b4 in __libc_message (do_abort=do_abort at entry=1, 
fmt=fmt at entry=0x7ffff7329210 "*** Error in `%s': %s: 0x%s ***\n")
     at ../sysdeps/posix/libc_fatal.c:175
#3  0x00007ffff723998e in malloc_printerr (action=1, str=0x7ffff7329318 
"double free or corruption (!prev)", ptr=<optimized out>) at malloc.c:4996
#4  0x00007ffff723a696 in _int_free (av=<optimized out>, p=<optimized 
out>, have_lock=0) at malloc.c:3840
#5  0x000055555555f027 in ?? ()
#6  0x000055555555cdb5 in ?? ()
#7  0x000055555555cf6e in ?? ()
#8  0x000055555555a359 in ?? ()
#9  0x00005555555581e5 in ?? ()
#10 0x00007ffff71e2b45 in __libc_start_main (main=0x555555557870, 
argc=2, argv=0x7fffffffe978, init=<optimized out>, fini=<optimized out>,
     rtld_fini=<optimized out>, stack_end=0x7fffffffe968) at 
libc-start.c:287
#11 0x00005555555593d7 in ?? ()
(gdb)