[Bug 1805914] Stacktrace.txt

[Apport retracing service]

** Attachment added: "Stacktrace.txt"
   https://bugs.launchpad.net/bugs/1805914/+attachment/5217536/+files/Stacktrace.txt

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Title:
  git assert failure: munmap_chunk(): invalid pointer

Status in git package in Ubuntu:
  New

Bug description:
  This seems to be reproducible with

  git clone https://github.com/zulip/zulip.git
  cd zulip
  git grep -i 'redirect.*login'

  Valgrind log attached.

  ProblemType: Crash
  DistroRelease: Ubuntu 18.10
  Package: git 1:2.19.1-1ubuntu1.1
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  NonfreeKernelModules: openafs
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  AssertionMessage: munmap_chunk(): invalid pointer
  CurrentDesktop: GNOME
  Date: Thu Nov 29 16:02:46 2018
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/git
  InstallationDate: Installed on 2016-02-19 (1014 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160218)
  ProcCmdline: git grep -i redirect.*login
  Signal: 6
  SourcePackage: git
  StacktraceTop:
   __libc_message (action=action at entry=do_abort, fmt=fmt at entry=0x7f3162540c00 "%s\n") at ../sysdeps/posix/libc_fatal.c:181
   malloc_printerr (str=str at entry=0x7f3162542848 "munmap_chunk(): invalid pointer") at malloc.c:5336
   munmap_chunk (p=<optimized out>) at malloc.c:2830
   grep_source_clear (gs=gs at entry=0x55757aa67a38 <todo+2200>) at grep.c:2087
   work_done (w=<optimized out>) at builtin/grep.c:160
  Title: git assert failure: munmap_chunk(): invalid pointer
  UpgradeStatus: Upgraded to cosmic on 2018-08-17 (104 days ago)
  UserGroups: adm audio bumblebee cdrom dip docker libvirt libvirtd lpadmin lxd mock plugdev sambashare sbuild sudo wireshark
  modified.conffile..etc.apport.crashdb.conf: [modified]
  mtime.conffile..etc.apport.crashdb.conf: 2018-07-03T15:41:08.765813

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