Public bug reported:

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@entry=do_abort, fmt=fmt@entry=0x7f3162540c00 
"%s\n") at ../sysdeps/posix/libc_fatal.c:181
 malloc_printerr (str=str@entry=0x7f3162542848 "munmap_chunk(): invalid 
pointer") at malloc.c:5336
 munmap_chunk (p=<optimized out>) at malloc.c:2830
 grep_source_clear (gs=gs@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

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


** Tags: amd64 apport-crash cosmic need-amd64-retrace wayland-session

** Attachment added: "valgrind.log"
   
https://bugs.launchpad.net/bugs/1805914/+attachment/5217521/+files/valgrind.log

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1805914

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

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