[Bug 1123588]

[Doko-v]

Created attachment 29482
test case

no reduced test case yet, but there is a diff in the tree dump with
-fdump-tree-dse in the test_deserialise_ptrace function:

diff -u <working version> <not-working version>

--- revert/upstart-1.6.1/init/test_job.c.132t.dse2
+++ norevert/upstart-1.6.1/init/test_job.c.132t.dse2
@@ -367,12 +367,8 @@
   abort ();
 
 <bb 44>:
-  job_64->goal = 1;
-  job_64->state = 3;
   D.9269_65 = job_64->pid;
   *D.9269_65 = pid_49;
-  job_64->trace_forks = 0;
-  job_64->trace_state = 3;
 
 <bb 45>:
   __ret_66 = nih_str_array_new (0B);

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https://bugs.launchpad.net/bugs/1123588

Title:
   [4.7 Regression] wrong code with the fix for PR53844

Status in The GNU Compiler Collection:
  Invalid
Status in “gcc-4.7” package in Ubuntu:
  Invalid
Status in “upstart” package in Ubuntu:
  Triaged
Status in “gcc-4.7” source package in Raring:
  Invalid
Status in “upstart” source package in Raring:
  Triaged

Bug description:
  seen with -21ubuntu1, not with -20ubuntu1, reverting the fix for
  PR53844 avoids the issue.

  I think we need a reproducer in upstart, which doesn't just hang.

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