[Bug 1954696] Re: ssh assert failure: malloc_consolidate(): unaligned fastbin chunk detected

[Apport retracing service]

*** This bug is a duplicate of bug 1953187 ***
    https://bugs.launchpad.net/bugs/1953187

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 #1953187, 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.

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** This bug has been marked a duplicate of private bug 1953187

** Information type changed from Private to Public

** Tags removed: need-amd64-retrace

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https://bugs.launchpad.net/bugs/1954696

Title:
  ssh assert failure: malloc_consolidate(): unaligned fastbin chunk
  detected

Status in openssh package in Ubuntu:
  New

Bug description:
  ssh with GSSAPITrustDNS=true causes this crash, reported in Ubuntu
  20.04 as well.

  ProblemType: Crash
  DistroRelease: Ubuntu 21.10
  Package: openssh-client 1:8.4p1-6ubuntu2
  Uname: Linux 5.13.19.20211207 x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  AssertionMessage: malloc_consolidate(): unaligned fastbin chunk detected
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Thu Dec  9 19:13:03 2021
  ExecutablePath: /usr/bin/ssh
  InstallationDate: Installed on 2019-10-07 (798 days ago)
  InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  ProcCmdline: ssh -n -tt -S none -o ProxyCommand='/usr/bin/mosh'\ '--family=prefer-inet'\ --fake-proxy\ --\ %h\ %p home -- mosh-server\ 'new'\ '-c'\ '8'\ '-s'\ '-l'\ 'LANG=en_US.UTF-8'\ '-l'\ 'LANGUAGE=en_US'\ '-l'\ 'LC_NUMERIC=en_US.UTF-8'\ '-l'\ 'LC_TIME=en_GB.UTF-8'\ '-l'\ 'LC_COLLATE=en_US.UTF-8'\ '-l'\ 'LC_MONETARY=en_US.UTF-8'\ '-l'\ 'LC_MEASUREMENT=en_US.UTF-8'
  RelatedPackageVersions:
   ssh-askpass       N/A
   libpam-ssh        N/A
   keychain          N/A
   ssh-askpass-gnome N/A
  SSHClientVersion: OpenSSH_8.4p1 Ubuntu-6ubuntu2, OpenSSL 1.1.1l  24 Aug 2021
  Signal: 6
  SourcePackage: openssh
  StacktraceTop:
   __libc_message (action=action at entry=do_abort, fmt=fmt at entry=0x7f880650b13d "%s\n") at ../sysdeps/posix/libc_fatal.c:155
   malloc_printerr (str=str at entry=0x7f880650dbc8 "malloc_consolidate(): unaligned fastbin chunk detected") at malloc.c:5543
   malloc_consolidate (av=av at entry=0x7f8806544c60 <main_arena>) at malloc.c:4637
   _int_malloc (av=av at entry=0x7f8806544c60 <main_arena>, bytes=bytes at entry=1280) at malloc.c:3852
   __GI___libc_malloc (bytes=1280) at malloc.c:3208
  Title: ssh assert failure: malloc_consolidate(): unaligned fastbin chunk detected
  UpgradeStatus: Upgraded to impish on 2021-10-20 (53 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare src sudo video wireshark
  modified.conffile..etc.apport.crashdb.conf: [modified]
  modified.conffile..etc.ssh.ssh_config: [modified]
  mtime.conffile..etc.apport.crashdb.conf: 2021-05-06T22:22:53.957540
  mtime.conffile..etc.ssh.ssh_config: 2020-06-18T20:59:08.420114
  separator:

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