Thanks. I could reproduce the issue - it turns out to be a bug that only
happens for Acquire::Queue-Mode=access - which is not the default and
did not have any test case.

I have a fix pending for it in:

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  Segmentation fault when running apt update using libapt-pkg5.90_1.9.2

Status in apt package in Ubuntu:
  Fix Committed

Bug description:
  apt update doesn't work after upgrading apt to 1.9.2 with strace:
  openat(AT_FDCWD, "/var/lib/apt/lists/lock", O_RDWR|O_CREAT|O_NOFOLLOW, 0640) 
= 4
  fcntl(4, F_SETFD, FD_CLOEXEC)           = 0
  fcntl(4, F_SETLK, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0, l_len=0}) = 0
  --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x5e} ---
  +++ killed by SIGSEGV (core dumped) +++

  downgrading libapt-pkg5.90 to 1.9.1 fixes it.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: libapt-pkg5.90 1.9.2
  ProcVersionSignature: Ubuntu 5.2.0-8.9+test1-generic 5.2.0
  Uname: Linux 5.2.0-8-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sat Aug 10 21:27:42 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-09-28 (1411 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: apt
  UpgradeStatus: Upgraded to eoan on 2019-07-26 (14 days ago)

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