Public bug reported:

`hg clone http://hg.netbeans.org/main-golden/` fails iff it's invoked on
a cifs-share with the error `*** Error in `/usr/bin/python': double free
or corruption (!prev): 0x00000000023168d0 ***`. It works fine when
invoked in a normal btrfs directory. The issue is reproducible

A `gdb` backtrace:

    #0  0x00007ffff761c267 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:55
    #1  0x00007ffff761deca in __GI_abort () at abort.c:89
    #2  0x00007ffff765fc53 in __libc_message (do_abort=do_abort@entry=1, 
fmt=fmt@entry=0x7ffff77781a8 "*** Error in `%s': %s: 0x%s ***\n") at 
../sysdeps/posix/libc_fatal.c:175
    #3  0x00007ffff7667c69 in malloc_printerr (ptr=<optimized out>, 
str=0x7ffff77782d8 "double free or corruption (!prev)", action=1) at 
malloc.c:4965
    #4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at 
malloc.c:3834
    #5  0x00007ffff766b89c in __GI___libc_free (mem=<optimized out>) at 
malloc.c:2950
    #6  0x00007ffff19d3e11 in lfree (a=a@entry=0xdc8e50) at 
mercurial/mpatch.c:67
    #7  0x00007ffff19d42e7 in decode (len=126, bin=0xe4b6c8 "") at 
mercurial/mpatch.c:228
    #8  fold (bins=[<buffer at remote 0x7ffff17c70f0>], start=start@entry=0, 
end=end@entry=1) at mercurial/mpatch.c:296
    #9  0x00007ffff19d43d3 in patches (self=<optimized out>, args=<optimized 
out>) at mercurial/mpatch.c:327
    #10 0x00000000004ccd05 in call_function (oparg=<optimized out>, 
pp_stack=<optimized out>) at ../Python/ceval.c:4035
    #11 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #12 0x00000000004cd4e2 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4121
    #13 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #14 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #15 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #16 0x00000000004ce7d3 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #17 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #18 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #19 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #20 0x00000000004ce7d3 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #21 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #22 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #23 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #24 0x00000000004ce7d3 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #25 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #26 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #27 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #28 0x00000000004cd217 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #29 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #30 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #31 0x00000000004cd4e2 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4121
    #32 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #33 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #34 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #35 0x00000000004cd217 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #36 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #37 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #38 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #39 0x00000000004cd217 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #40 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #41 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #42 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #43 0x00000000004cd217 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #44 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #45 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #46 0x00000000004e7cc8 in PyEval_EvalCodeEx (closure=<optimized out>, 
defcount=<optimized out>, defs=<optimized out>, kwcount=<optimized out>, 
kws=<optimized out>, 
        argcount=<optimized out>, args=<optimized out>, locals=<optimized out>, 
globals=<optimized out>, co=<optimized out>) at ../Python/ceval.c:3267
    #47 function_call.lto_priv () at ../Objects/funcobject.c:526
    #48 0x00000000004cf239 in PyObject_Call (kw=<optimized out>, arg=<optimized 
out>, func=<optimized out>) at ../Objects/abstract.c:2529
    #49 ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized 
out>, pp_stack=<optimized out>, func=<optimized out>) at ../Python/ceval.c:4348
    #50 PyEval_EvalFrameEx () at ../Python/ceval.c:2720
    #51 0x00000000004e7cc8 in PyEval_EvalCodeEx (closure=<optimized out>, 
defcount=<optimized out>, defs=<optimized out>, kwcount=<optimized out>, 
kws=<optimized out>, 
        argcount=<optimized out>, args=<optimized out>, locals=<optimized out>, 
globals=<optimized out>, co=<optimized out>) at ../Python/ceval.c:3267
    ---Type <return> to continue, or q <return> to quit--- 
    #52 function_call.lto_priv () at ../Objects/funcobject.c:526
    #53 0x00000000004cf239 in PyObject_Call (kw=<optimized out>, arg=<optimized 
out>, func=<optimized out>) at ../Objects/abstract.c:2529
    #54 ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized 
out>, pp_stack=<optimized out>, func=<optimized out>) at ../Python/ceval.c:4348
    #55 PyEval_EvalFrameEx () at ../Python/ceval.c:2720
    #56 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #57 0x00000000004ce7d3 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #58 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #59 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #60 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #61 0x00000000004ce7d3 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #62 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #63 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #64 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #65 0x00000000004ce7d3 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #66 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #67 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #68 0x00000000004cd4e2 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4121
    #69 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #70 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #71 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #72 0x00000000004ce7d3 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4131
    #73 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #74 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #75 0x00000000004cd4e2 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4121
    #76 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #77 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #78 0x00000000004cd4e2 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4121
    #79 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #80 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #81 0x00000000004cd4e2 in fast_function (nk=<optimized out>, na=<optimized 
out>, n=<optimized out>, pp_stack=<optimized out>, func=<optimized out>) at 
../Python/ceval.c:4121
    #82 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
    #83 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
    #84 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
    #85 0x000000000050481f in PyEval_EvalCode (
        locals={'fp': <file at remote 0x7ffff7fd81e0>, 'demandimport': <module 
at remote 0x7ffff7e75ad0>, '__builtins__': <module at remote 0x7ffff7fb6b08>, 
'mercurial': <module at remote 0x7ffff7e75788>, '__file__': '/usr/bin/hg', 
'libdir': '@LIBDIR@', '__package__': None, 'sys': <module at remote 
0x7ffff7fb6bb0>, '__name__': '__main__', 'os': <module at remote 
0x7ffff7f89d00>, '__doc__': None}, 
        globals={'fp': <file at remote 0x7ffff7fd81e0>, 'demandimport': <module 
at remote 0x7ffff7e75ad0>, '__builtins__': <module at remote 0x7ffff7fb6b08>, 
'mercurial': <module at remote 0x7ffff7e75788>, '__file__': '/usr/bin/hg', 
'libdir': '@LIBDIR@', '__package__': None, 'sys': <module at remote 
0x7ffff7fb6bb0>, '__name__': '__main__', 'os': <module at remote 
0x7ffff7f89d00>, '__doc__': None}, co=0x7ffff7e5e5b0) at ../Python/ceval.c:669
    #86 run_mod.lto_priv () at ../Python/pythonrun.c:1371
    #87 0x00000000004fc182 in PyRun_FileExFlags () at ../Python/pythonrun.c:1357
    #88 0x00000000004fb247 in PyRun_SimpleFileExFlags () at 
../Python/pythonrun.c:949
    #89 0x000000000049aa6e in Py_Main () at ../Modules/main.c:640
    #90 0x00007ffff7607a40 in __libc_start_main (main=0x49a500 <main>, argc=5, 
argv=0x7fffffffd2e8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, 
        stack_end=0x7fffffffd2d8) at libc-start.c:289
    #91 0x000000000049a429 in _start ()

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: mercurial 3.1.2-2
Uname: Linux 4.0.1-040001-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed May  6 23:55:01 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-02 (34 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: mercurial
SystemImageInfo:
 current build number: 0
 device name: 
 channel: daily
 last update: Unknown
UpgradeStatus: No upgrade log present (probably fresh install)
--- 
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 15.04
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-02 (34 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
Package: mercurial 3.1.2-2
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SystemImageInfo:
 current build number: 0
 device name: 
 channel: daily
 last update: Unknown
Tags:  vivid
Uname: Linux 4.0.1-040001-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm bumblebee cdrom dip libvirtd lpadmin plugdev sambashare sudo
_MarkForUpload: True

** Affects: mercurial (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug apport-collected vivid

** Tags added: apport-collected

** Description changed:

  `hg clone http://hg.netbeans.org/main-golden/` fails iff it's invoked on
  a cifs-share with the error `*** Error in `/usr/bin/python': double free
  or corruption (!prev): 0x00000000023168d0 ***`. It works fine when
  invoked in a normal btrfs directory. The issue is reproducible
  
  A `gdb` backtrace:
  
      #0  0x00007ffff761c267 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:55
      #1  0x00007ffff761deca in __GI_abort () at abort.c:89
      #2  0x00007ffff765fc53 in __libc_message (do_abort=do_abort@entry=1, 
fmt=fmt@entry=0x7ffff77781a8 "*** Error in `%s': %s: 0x%s ***\n") at 
../sysdeps/posix/libc_fatal.c:175
      #3  0x00007ffff7667c69 in malloc_printerr (ptr=<optimized out>, 
str=0x7ffff77782d8 "double free or corruption (!prev)", action=1) at 
malloc.c:4965
      #4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at 
malloc.c:3834
      #5  0x00007ffff766b89c in __GI___libc_free (mem=<optimized out>) at 
malloc.c:2950
      #6  0x00007ffff19d3e11 in lfree (a=a@entry=0xdc8e50) at 
mercurial/mpatch.c:67
      #7  0x00007ffff19d42e7 in decode (len=126, bin=0xe4b6c8 "") at 
mercurial/mpatch.c:228
      #8  fold (bins=[<buffer at remote 0x7ffff17c70f0>], start=start@entry=0, 
end=end@entry=1) at mercurial/mpatch.c:296
      #9  0x00007ffff19d43d3 in patches (self=<optimized out>, args=<optimized 
out>) at mercurial/mpatch.c:327
      #10 0x00000000004ccd05 in call_function (oparg=<optimized out>, 
pp_stack=<optimized out>) at ../Python/ceval.c:4035
      #11 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #12 0x00000000004cd4e2 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4121
      #13 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #14 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #15 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #16 0x00000000004ce7d3 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #17 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #18 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #19 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #20 0x00000000004ce7d3 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #21 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #22 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #23 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #24 0x00000000004ce7d3 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #25 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #26 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #27 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #28 0x00000000004cd217 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #29 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #30 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #31 0x00000000004cd4e2 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4121
      #32 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #33 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #34 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #35 0x00000000004cd217 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #36 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #37 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #38 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #39 0x00000000004cd217 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #40 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #41 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #42 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #43 0x00000000004cd217 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #44 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #45 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #46 0x00000000004e7cc8 in PyEval_EvalCodeEx (closure=<optimized out>, 
defcount=<optimized out>, defs=<optimized out>, kwcount=<optimized out>, 
kws=<optimized out>, 
          argcount=<optimized out>, args=<optimized out>, locals=<optimized 
out>, globals=<optimized out>, co=<optimized out>) at ../Python/ceval.c:3267
      #47 function_call.lto_priv () at ../Objects/funcobject.c:526
      #48 0x00000000004cf239 in PyObject_Call (kw=<optimized out>, 
arg=<optimized out>, func=<optimized out>) at ../Objects/abstract.c:2529
      #49 ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized 
out>, pp_stack=<optimized out>, func=<optimized out>) at ../Python/ceval.c:4348
      #50 PyEval_EvalFrameEx () at ../Python/ceval.c:2720
      #51 0x00000000004e7cc8 in PyEval_EvalCodeEx (closure=<optimized out>, 
defcount=<optimized out>, defs=<optimized out>, kwcount=<optimized out>, 
kws=<optimized out>, 
          argcount=<optimized out>, args=<optimized out>, locals=<optimized 
out>, globals=<optimized out>, co=<optimized out>) at ../Python/ceval.c:3267
      ---Type <return> to continue, or q <return> to quit--- 
      #52 function_call.lto_priv () at ../Objects/funcobject.c:526
      #53 0x00000000004cf239 in PyObject_Call (kw=<optimized out>, 
arg=<optimized out>, func=<optimized out>) at ../Objects/abstract.c:2529
      #54 ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized 
out>, pp_stack=<optimized out>, func=<optimized out>) at ../Python/ceval.c:4348
      #55 PyEval_EvalFrameEx () at ../Python/ceval.c:2720
      #56 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #57 0x00000000004ce7d3 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #58 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #59 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #60 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #61 0x00000000004ce7d3 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #62 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #63 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #64 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #65 0x00000000004ce7d3 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #66 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #67 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #68 0x00000000004cd4e2 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4121
      #69 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #70 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #71 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #72 0x00000000004ce7d3 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4131
      #73 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #74 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #75 0x00000000004cd4e2 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4121
      #76 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #77 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #78 0x00000000004cd4e2 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4121
      #79 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #80 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #81 0x00000000004cd4e2 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=<optimized out>, pp_stack=<optimized out>, 
func=<optimized out>) at ../Python/ceval.c:4121
      #82 call_function (oparg=<optimized out>, pp_stack=<optimized out>) at 
../Python/ceval.c:4056
      #83 PyEval_EvalFrameEx () at ../Python/ceval.c:2681
      #84 0x00000000004cb6b1 in PyEval_EvalCodeEx () at ../Python/ceval.c:3267
      #85 0x000000000050481f in PyEval_EvalCode (
          locals={'fp': <file at remote 0x7ffff7fd81e0>, 'demandimport': 
<module at remote 0x7ffff7e75ad0>, '__builtins__': <module at remote 
0x7ffff7fb6b08>, 'mercurial': <module at remote 0x7ffff7e75788>, '__file__': 
'/usr/bin/hg', 'libdir': '@LIBDIR@', '__package__': None, 'sys': <module at 
remote 0x7ffff7fb6bb0>, '__name__': '__main__', 'os': <module at remote 
0x7ffff7f89d00>, '__doc__': None}, 
          globals={'fp': <file at remote 0x7ffff7fd81e0>, 'demandimport': 
<module at remote 0x7ffff7e75ad0>, '__builtins__': <module at remote 
0x7ffff7fb6b08>, 'mercurial': <module at remote 0x7ffff7e75788>, '__file__': 
'/usr/bin/hg', 'libdir': '@LIBDIR@', '__package__': None, 'sys': <module at 
remote 0x7ffff7fb6bb0>, '__name__': '__main__', 'os': <module at remote 
0x7ffff7f89d00>, '__doc__': None}, co=0x7ffff7e5e5b0) at ../Python/ceval.c:669
      #86 run_mod.lto_priv () at ../Python/pythonrun.c:1371
      #87 0x00000000004fc182 in PyRun_FileExFlags () at 
../Python/pythonrun.c:1357
      #88 0x00000000004fb247 in PyRun_SimpleFileExFlags () at 
../Python/pythonrun.c:949
      #89 0x000000000049aa6e in Py_Main () at ../Modules/main.c:640
      #90 0x00007ffff7607a40 in __libc_start_main (main=0x49a500 <main>, 
argc=5, argv=0x7fffffffd2e8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, 
          stack_end=0x7fffffffd2d8) at libc-start.c:289
      #91 0x000000000049a429 in _start ()
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: mercurial 3.1.2-2
  Uname: Linux 4.0.1-040001-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed May  6 23:55:01 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-04-02 (34 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: mercurial
  SystemImageInfo:
   current build number: 0
   device name: 
   channel: daily
   last update: Unknown
  UpgradeStatus: No upgrade log present (probably fresh install)
+ --- 
+ ApportVersion: 2.17.2-0ubuntu1
+ Architecture: amd64
+ CurrentDesktop: Unity
+ DistroRelease: Ubuntu 15.04
+ EcryptfsInUse: Yes
+ InstallationDate: Installed on 2015-04-02 (34 days ago)
+ InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
+ Package: mercurial 3.1.2-2
+ PackageArchitecture: amd64
+ ProcEnviron:
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
+ SystemImageInfo:
+  current build number: 0
+  device name: 
+  channel: daily
+  last update: Unknown
+ Tags:  vivid
+ Uname: Linux 4.0.1-040001-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm bumblebee cdrom dip libvirtd lpadmin plugdev sambashare sudo
+ _MarkForUpload: True

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https://bugs.launchpad.net/bugs/1452471

Title:
  hg clone fails with error "double free or corruption (!prev)" on cifs-
  share

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