Comment 2 for bug 916576

StacktraceTop:
 push_ucs2_talloc (ctx=0x0, dest=0x7fffd97a7b68, src=0x0, converted_size=0x7fffd97a7b60) at lib/charcnv.c:1160
 E_md4hash (passwd=0x0, p16=0x7fffd97a7ca0 "\b") at ../libcli/auth/smbencrypt.c:78
 create_volume_objectid (conn=<optimized out>, objid=0x7fffd97a7ca0 "\b") at smbd/trans2.c:2885
 call_nt_transact_ioctl (max_data_count=64, data_count=64, ppdata=<optimized out>, setup_count=<optimized out>, ppsetup=<optimized out>, req=0x7f9f5c96da20, conn=0x7f9f5c8a1a00, ppparams=<optimized out>, parameter_count=<optimized out>) at smbd/nttrans.c:2205
 handle_nttrans (conn=0x7f9f5c8a1a00, state=<optimized out>, req=0x7f9f5c96da20) at smbd/nttrans.c:2904