[Bug 898077] Re: backtrace fails with recursive functions on 64bit (BZ #12432)

[Alessandro Menti]

Confirmed and added the link to the external bug report.

I suggest you create a Bazaar branch of the current development version
of eglibc (2.13-20ubuntu6), fix the problem there and then link the
created branch here, this would speed up the release - see
<https://wiki.ubuntu.com/Bugs/HowToFix> for detailed instructions.

If you have any questions, just ask in the #ubuntu-devel IRC channel or
leave a comment here. Thanks!

** Changed in: eglibc (Ubuntu)
       Status: New => Confirmed

** Bug watch added: Sourceware.org Bugzilla #12432
   http://sourceware.org/bugzilla/show_bug.cgi?id=12432

** Also affects: eglibc via
   http://sourceware.org/bugzilla/show_bug.cgi?id=12432
   Importance: Unknown
       Status: Unknown

** Description changed:

+ glibc's backtrace() function fails to give a complete backtrace with
+ 64-bit code when calling a recursive function. A 32-bit executable does
+ produce a correct backtrace. Using -fno-omit-frame-pointer does not
+ solve the problem for the 64-bit code.
+ 
  This is alredy fixed in (e)glibc 2.14
  
  http://sources.redhat.com/bugzilla/show_bug.cgi?id=12432
  
-  [BZ #12432]
-  * sysdeps/ia64/backtrace.c (struct trace_reg): Add cfa element.
-  (dummy_getcfa): New function.
-  (init): Get _Unwind_GetCFA address, use dummy if not found.
-  (backtrace_helper): In recursion check, also check whether CFA changes.
-  (__backtrace): Completely initialize arg.
+  [BZ #12432]
+  * sysdeps/ia64/backtrace.c (struct trace_reg): Add cfa element.
+  (dummy_getcfa): New function.
+  (init): Get _Unwind_GetCFA address, use dummy if not found.
+  (backtrace_helper): In recursion check, also check whether CFA changes.
+  (__backtrace): Completely initialize arg.
  
+ I suggest to backport this fix to (e)glibc 2.12/2.13 for ubuntu
+ maverick/natty/oneiric.
  
- I suggest to backport this fix to (e)glibc 2.12/2.13 for ubuntu maverick/natty/oneiric.
- 
- Pacth has been tested for 
- eglibc_2.12.1-0ubuntu10.2
+ The patch has been tested for eglibc_2.12.1-0ubuntu10.2.

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https://bugs.launchpad.net/bugs/898077

Title:
  backtrace fails with recursive functions on 64bit (BZ #12432)

Status in Embedded GLIBC:
  Unknown
Status in “eglibc” package in Ubuntu:
  Confirmed

Bug description:
  glibc's backtrace() function fails to give a complete backtrace with
  64-bit code when calling a recursive function. A 32-bit executable
  does produce a correct backtrace. Using -fno-omit-frame-pointer does
  not solve the problem for the 64-bit code.

  This is alredy fixed in (e)glibc 2.14

  http://sources.redhat.com/bugzilla/show_bug.cgi?id=12432

   [BZ #12432]
   * sysdeps/ia64/backtrace.c (struct trace_reg): Add cfa element.
   (dummy_getcfa): New function.
   (init): Get _Unwind_GetCFA address, use dummy if not found.
   (backtrace_helper): In recursion check, also check whether CFA changes.
   (__backtrace): Completely initialize arg.

  I suggest to backport this fix to (e)glibc 2.12/2.13 for ubuntu
  maverick/natty/oneiric.

  The patch has been tested for eglibc_2.12.1-0ubuntu10.2.

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