On 02/21/13 13:50, Duy Nguyen wrote:
On Thu, Feb 21, 2013 at 7:27 PM, Per Cederqvist <ced...@opera.com> wrote:
Running "git branch HEAD" may be a stupid thing to do. It actually
was a mistake on my part. Still, I don't think git should dereference
a NULL pointer.


We should not. Can you make a patch to fix it (with test cases)? You
may want to fix the two preceding blocks, "if (new_upstream)" and "if
(unset_upstream)", as well. They don't check for NULL branch either. I
think we can say something like "detached HEAD is not valid for this
operation" before exit.

Sorry, but isolating the issue reporting it here is about as much time
as I can spend on this issue. Learning the coding standard of Git and
how to write test cases is not something I'm prepared to do, at least
not at the moment. I hope there is a place for users and reporters of
bugs in the Git community.

    /ceder


Tested using git 1.8.1.4 adn 1.8.1.1.

Repeat by:

     mkdir branchcrash || exit 1
     cd branchcrash
     git init
     touch a; git add a; git commit -m"Added a".
     touch b; git add b; git commit -m"Added b".
     git checkout HEAD^
     git branch HEAD

The last command dumps core.  gdb session:

gdb /usr/local/bin/git core
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /usr/local/bin/git...done.
[New LWP 7174]

warning: Can't read pathname for load map: Input/output error.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `git branch HEAD'.
Program terminated with signal 11, Segmentation fault.
#0  cmd_branch (argc=1, argv=0x7fffe6e2a0f0, prefix=<optimized out>)
     at builtin/branch.c:919
919                     strbuf_addf(&buf, "refs/remotes/%s", branch->name);
(gdb) bt
#0  cmd_branch (argc=1, argv=0x7fffe6e2a0f0, prefix=<optimized out>)
     at builtin/branch.c:919
#1  0x00000000004046ac in run_builtin (argv=0x7fffe6e2a0f0, argc=2,
     p=<optimized out>) at git.c:273
#2  handle_internal_command (argc=2, argv=0x7fffe6e2a0f0) at git.c:434
#3  0x0000000000404df3 in run_argv (argv=0x7fffe6e29f90,
argcp=0x7fffe6e29f9c)
     at git.c:480
#4  main (argc=2, argv=0x7fffe6e2a0f0) at git.c:555
(gdb) p branch
$1 = (struct branch *) 0x0
(gdb) quit

     /ceder
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