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[Marco Trevisan (Treviño) <mail@xxxxxxxxx>]

Full stacktrace, including u8 symbols (missing in the automatic
retrace).

Unity seems fine actually, but crash happens when calling
pam_authenticate where the pamHandle is something like:

{authtok = 0x7fb300000000 <error: Cannot access memory at address 0x7fb300000000>, 
  caller_is = 3944807584, pam_conversation = 0xffffffff, oldauthtok = 0x0, prompt = 0x0, 
  service_name = 0x0, user = 0x0, rhost = 0x0, 
  ruser = 0xffffffff <error: Cannot access memory at address 0xffffffff>, tty = 0x0, 
  xdisplay = 0x0, authtok_type = 0x0, data = 0x0, env = 0x0, fail_delay = {set = PAM_FALSE, 
    delay = 0, begin = 0, delay_fn_ptr = 0x0}, xauth = {namelen = 0, 
    name = 0xffffffffffffffff <error: Cannot access memory at address 0xffffffffffffffff>, 
    datalen = 36901392, 
    data = 0xffffffff00000001 <error: Cannot access memory at address 0xffffffff00000001>}, 
  handlers = {module = 0x232d370, modules_allocated = 36855568, modules_used = 0, 
    handlers_loaded = 36898784, conf = {authenticate = 0x0, setcred = 0x21, 
      acct_mgmt = 0x6d6f6e675f6d6170, open_session = 0x6e697279656b5f65, 
      close_session = 0x7f006f730067, chauthtok = 0x21}, other = {
      authenticate = 0x6c61776b5f6d6170, setcred = 0x6f730074656c, acct_mgmt = 0x0, 
      open_session = 0xd1, close_session = 0x7fb300000000, chauthtok = 0x0}}, former = {
    choice = -1, depth = 0, impression = 0, status = 0, substates = 0x0, fail_user = 0, 
    want_user = 0, prompt = 0x0, update = PAM_FALSE}, 
  mod_name = 0xffffffff <error: Cannot access memory at address 0xffffffff>, mod_argc = 0, 
  mod_argv = 0x0, choice = 0, audit_state = 0}

Not sure if it might be a threading issue

** Summary changed:

- unity8 crashed with SIGSEGV in _IO_vfprintf_internal() - When logging in
+ unity8 crashed with SIGSEGV in QLightDM::GreeterImpl::authenticateWithPam() when logging in

** Attachment added: "Stacktrace with symbols"
   https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1425362/+attachment/4326859/+files/Stacktrace

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https://bugs.launchpad.net/bugs/1425362

Title:
  unity8 crashed with SIGSEGV in
  QLightDM::GreeterImpl::authenticateWithPam() when logging in

Status in unity8 package in Ubuntu:
  New

Bug description:
  I'm trying to run unity8 in a vivid vmware session (mir works fine here).
  But unity8 crashes when logging in, and it happens again everytime I insert my password in the u8 lockscreen.

  ProblemType: Crash
  DistroRelease: Ubuntu 15.04
  Package: unity8 8.02+15.04.20150224-0ubuntu1
  ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5
  Uname: Linux 3.18.0-13-generic x86_64
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: amd64
  CrashCounter: 1
  Date: Tue Feb 24 18:09:32 2015
  ExecutablePath: /usr/bin/unity8
  InstallationDate: Installed on 2015-02-25 (0 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150224)
  ProcCmdline: unity8
  SegvAnalysis:
   Segfault happened at: 0x7fb33b34c3a9 <_IO_vfprintf_internal+5561>:	repnz scas %es:(%rdi),%al
   PC (0x7fb33b34c3a9) ok
   source "%es:(%rdi)" (0xffffffff) not located in a known VMA region (needed readable region)!
   destination "%al" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: unity8
  StacktraceTop:
   _IO_vfprintf_internal (s=s@entry=0x7fb2ea5b69d0, format=<optimized out>, format@entry=0x7fb2f7a8f2d3 "%s(%s:%s):", ap=ap@entry=0x7fb2ea5b6b08) at vfprintf.c:2039
   __GI___vasprintf_chk (result_ptr=0x7fb2ea5b6be8, flags=1, format=0x7fb2f7a8f2d3 "%s(%s:%s):", args=args@entry=0x7fb2ea5b6b08) at vasprintf_chk.c:66
   __asprintf_chk (result_ptr=<optimized out>, flags=<optimized out>, format=<optimized out>) at asprintf_chk.c:32
   pam_vsyslog () from /lib/x86_64-linux-gnu/libpam.so.0
   pam_syslog () from /lib/x86_64-linux-gnu/libpam.so.0
  Title: unity8 crashed with SIGSEGV in _IO_vfprintf_internal()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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