zsh5 crashed with SIGSEGV in pattryrefs()

[Joost Cassee]

zsh crashed while doing file completion on a large directory.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: zsh 5.1.1-1ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-13.29-generic 4.4.5
Uname: Linux 4.4.0-13-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Mar 18 11:31:56 2016
EcryptfsInUse: Yes
ExecutablePath: /bin/zsh5
InstallationDate: Installed on 2016-03-16 (1 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
ProcCmdline: -zsh
SegvAnalysis:
 Segfault happened at: 0x46eb65: cmpb $0x0,(%rax)
 PC (0x0046eb65) ok
 source "$0x0" ok
 destination "(%rax)" (0x7f39669f827a) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: zsh
StacktraceTop:
 ?? ()
 ?? ()
 pattryrefs ()
 pattry ()
 evalcond ()
Title: zsh5 crashed with SIGSEGV in pattryrefs()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1558710, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.