[Bug 1830796] Re: [Bionic][ARM64]Failure debugging linux kernel

[Manoj Iyer]

The attached debdiff to gdb fixes the issue. The patch was cleanly
applied from the upstream GDB git repo, and test results are as posted
to this bug report. No regression were found.

** Patch added: "Fix tagged pointer support."
   https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+attachment/5267248/+files/gdb-fix-tagged-pointer-support.diff

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https://bugs.launchpad.net/bugs/1830796

Title:
  [Bionic][ARM64]Failure debugging linux kernel

Status in gdb package in Ubuntu:
  In Progress

Bug description:
  [Impact]
  GDB fails to debug ARM64 vmlinux debug image with proc/kcore information. For example it is unable to print values of variables like 'jiffies_64'. 

  [Test]
  # gdb /usr/lib/debug/boot/vmlinux-4.18.0-20-generic  /proc/kcore
  [New process 1]
  Core was generated by `BOOT_IMAGE=/boot/vmlinuz-4.18.0-20-generic root=UUID=edb5e5a7-8272-4e13-aa25-37'.
  #0  0x0000000000000000 in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0xffff000009616980
  (gdb)

  [Fix]
  This issue was fixed upstream (git://sourceware.org/git/binutils-gdb.git) by the following patch:
  8727de56b0  Fix tagged pointer support

  [Regression Potential]
  The risk of regression after applying this patch is low, tagged pointer test cases still pass.

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