[Bug 1931391] Re: git bisect start crashed with SIGSEGV in buffer_slab_peek()

[Apport retracing service]

** Tags added: need-amd64-retrace

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Title:
  git bisect start crashed with SIGSEGV in buffer_slab_peek()

Status in git package in Ubuntu:
  New

Bug description:
  `git bisect start <filename>` always exits with a Segmentation fault.

  ProblemType: Crash
  DistroRelease: Ubuntu 20.04
  Package: git 1:2.25.1-1ubuntu3.1
  ProcVersionSignature: Ubuntu 5.4.0-65.73-generic 5.4.78
  Uname: Linux 5.4.0-65-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: XFCE
  Date: Wed Jun  9 11:24:04 2021
  ExecutablePath: /usr/bin/git
  InstallationDate: Installed on 2016-02-27 (1929 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  ProcCmdline: git bisect--helper --bisect-start synapse/storage/persist_events.py
  SegvAnalysis:
   Segfault happened at: 0x55d3ab6b0cde <get_cached_commit_buffer+14>:	mov    0x48(%rsi),%esi
   PC (0x55d3ab6b0cde) ok
   source "0x48(%rsi)" (0x00000048) not located in a known VMA region (needed readable region)!
   destination "%esi" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: git
  StacktraceTop:
   buffer_slab_peek (c=0x0, s=<optimized out>) at commit.c:290
   get_cached_commit_buffer (r=r at entry=0x55d3ab8e0680 <the_repo>, commit=commit at entry=0x0, sizep=sizep at entry=0x0) at commit.c:290
   repo_get_commit_buffer (r=r at entry=0x55d3ab8e0680 <the_repo>, commit=commit at entry=0x0, sizep=sizep at entry=0x0) at commit.c:306
   repo_logmsg_reencode (r=r at entry=0x55d3ab8e0680 <the_repo>, commit=commit at entry=0x0, commit_encoding=commit_encoding at entry=0x7ffc63d83518, output_encoding=output_encoding at entry=0x55d3ab80257a "UTF-8") at pretty.c:614
   repo_format_commit_message (r=0x55d3ab8e0680 <the_repo>, commit=commit at entry=0x0, format=format at entry=0x55d3ab815233 "%s", sb=sb at entry=0x7ffc63d83610, pretty_ctx=pretty_ctx at entry=0x7ffc63d83630) at pretty.c:1640
  Title: git crashed with SIGSEGV in buffer_slab_peek()
  UpgradeStatus: Upgraded to focal on 2021-02-16 (112 days ago)
  UserGroups: adm cdrom dialout dip docker input libvirt libvirtd lpadmin plugdev sambashare sbuild sudo wireshark
  modified.conffile..etc.apport.crashdb.conf: [modified]
  mtime.conffile..etc.apport.crashdb.conf: 2021-06-09T11:10:35.636012
  separator:

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