Re: [PATCH 3/3] fast-export: output reset command for commandline revs

[Thomas Rast <trast@student.ethz.ch>]

Sverre Rabbelier wrote:
> When a revision is specified on the commandline we explicitly output
> a 'reset' command for it if it was not handled already. This allows
> for example the remote-helper protocol to use fast-export to create
> branches that point to a commit that has already been exported.
> 
> Initial-patch-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>

My apologies if this is redundant, I'm not up to speed on progress
here.  But a crash in t9350.19 caught my eye:

  checking known breakage: 
          (
                  cd limit-by-paths &&
                  git fast-export master~2..master~1 > output &&
                  test_cmp output expected
          )

  ==23766== Invalid read of size 1
  ==23766==    at 0x4FD21E: prefixcmp (strbuf.c:9)
  ==23766==    by 0x42B936: handle_tags_and_duplicates (fast-export.c:563)
  ==23766==    by 0x42C274: cmd_fast_export (fast-export.c:732)
  ==23766==    by 0x4051F1: run_builtin (git.c:308)
  ==23766==    by 0x40538B: handle_internal_command (git.c:466)
  ==23766==    by 0x4054A5: run_argv (git.c:512)
  ==23766==    by 0x40562C: main (git.c:585)
  ==23766==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
  ==23766== 
  {
     <insert_a_suppression_name_here>
     Memcheck:Addr1
     fun:prefixcmp
     fun:handle_tags_and_duplicates
     fun:cmd_fast_export
     fun:run_builtin
     fun:handle_internal_command
     fun:run_argv
     fun:main
  }
  ==23766== 
  ==23766== Process terminating with default action of signal 11 (SIGSEGV)
  ==23766==  Access not within mapped region at address 0x0
  ==23766==    at 0x4FD21E: prefixcmp (strbuf.c:9)
  ==23766==    by 0x42B936: handle_tags_and_duplicates (fast-export.c:563)
  ==23766==    by 0x42C274: cmd_fast_export (fast-export.c:732)
  ==23766==    by 0x4051F1: run_builtin (git.c:308)
  ==23766==    by 0x40538B: handle_internal_command (git.c:466)
  ==23766==    by 0x4054A5: run_argv (git.c:512)
  ==23766==    by 0x40562C: main (git.c:585)

The crash is hidden by the fact that the test is test_expect_failure.
It bisects to this commit.  Perhaps we should distinguish between
test_expect_failure and test_expect_crash?...

-- 
Thomas Rast
trast@{inf,student}.ethz.ch