cfdisk segfaults

[Martin Pitt]

$ sudo cfdisk /dev/hdc segfaults immediately, both on i386 and amd64 (current
Breezy version).

The stack trace is not very helpful:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0 0x0000000000000000 in ?? ()
#1 0x0000000000000000 in ?? ()
#2 0x0000000100000000 in ?? ()
#3 0x0000000000000003 in ?? ()
[...] just zeros
#105 0x0000000000000000 in ?? ()
#106 0x0000000006dcb674 in ?? ()
#107 0x0000000000400e1d in ?? ()
#108 0x00002aaaaaab2d43 in _dl_rtld_di_serinfo () from /lib64/ld-linux-x86-64.so.2
Previous frame inner to this frame (corrupt stack?)

The trace does not get any better when building with -g (and still -O2). The
segfault does not happen at all if building with -O0 or -O1 (*sigh*).

So a temporary workaround is to build with -O1 until this is sorted out.

[Martin Pitt (pitti)]

 util-linux (2.12p-5ubuntu2) breezy; urgency=low
 .
   * debian/patches/60_opt_O1.dpatch:
     - MCONFIG, configure: Build with -O1 instead of -O2 to work around cfdisk
       segfault.
     - Yay for upstream build systems which do not support specifying CFLAGS or
       OPT without breaking.
     - Ubuntu #13486

Temporary workaround for now.

[LaMont Jones (lamont)]

*** Bug 19945 has been marked as a duplicate of this bug. ***

[LaMont Jones (lamont)]

Fixed in 2.12p-5ubuntu2. Thanks Martin.

[Martin Pitt (pitti)]

(In reply to comment #3)
> Fixed in 2.12p-5ubuntu2. Thanks Martin.

Lamont, wait, I uploaded this version with a *workaround*, not with a proper
fix. Unless this is a compiler bug, using -O1 instead of -O2 merely hides the
bug, I think.

[Adrian Bunk (bunk)]

Hi Martin,

if you have ReiserFS partitions this segfault is a bug in cfdisk fixed in
upstream util-linux 2.12r-pre1 and 2.13-pre3.

[Vassilis Pandis (pandisv)]

util-linux (2.12r-1) unstable; urgency=low

  * New upstream verison and maintainer.
    - cfdisk: fix a segfault with ReiserFS partitions

I'm closing this now. If it still happens, please reopen.