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

[Launchpad Bug Tracker]

This bug was fixed in the package gdb - 8.1-0ubuntu3.1

---
gdb (8.1-0ubuntu3.1) bionic; urgency=medium

  * Fix tagged pointer support. LP: #1830796

 -- Manoj Iyer   Fri, 28 Jun 2019 08:26:38
-0700

** Changed in: gdb (Ubuntu Bionic)
   Status: Fix Committed => Fix Released

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  Fix Released

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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

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

[Brian Murray]

I retried python3.6 and it passed, however apport failed again but that
is due to a timeout when connecting to Lanchpad so we've bad-tested that
failure.

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  Fix Committed

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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1830796] Re: [Bionic][ARM64]Failure debugging linux kernel

[Manoj Iyer]

== Proposed testing results ==

ubuntu@recht:~$ apt policy gdb
gdb:
  Installed: 8.1-0ubuntu3.1
  Candidate: 8.1-0ubuntu3.1
  Version table:
 *** 8.1-0ubuntu3.1 500
500 http://ports.ubuntu.com/ubuntu-ports bionic-proposed/main arm64 
Packages
100 /var/lib/dpkg/status
 8.1-0ubuntu3 500
500 http://ports.ubuntu.com/ubuntu-ports bionic/main arm64 Packages
ubuntu@recht:~$

ubuntu@recht:~$ sudo gdb /usr/lib/debug/boot/vmlinux-4.15.0-62-generic 
/proc/kcore
GNU gdb (Ubuntu 8.1-0ubuntu3.1) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "aarch64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/lib/debug/boot/vmlinux-4.15.0-62-generic...done.

warning: core file may not match specified executable file.
[New process 1]
Core was generated by `BOOT_IMAGE=/boot/vmlinuz-4.15.0-62-generic 
root=UUID=4e57d549-7669-4f93-82d9-8c'.
#0  0x in ?? ()
(gdb) p jiffies_64
$1 = 4295689599
(gdb)

** Tags removed: verification-needed
** Tags added: verification-done-bionic

** Tags removed: verification-needed-bionic
** Tags added: verification-done

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  Fix Committed

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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1830796] Re: [Bionic][ARM64]Failure debugging linux kernel

[Brian Murray]

Hello Manoj, or anyone else affected,

Accepted gdb into bionic-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/gdb/8.1-0ubuntu3.1 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: gdb (Ubuntu Bionic)
   Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  Fix Committed

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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Manoj Iyer]

== Regression test on PPC64EL ==

ubuntu@tiselius:~$ uname -a 
Linux tiselius 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:14:44 UTC 2018 
ppc64le ppc64le ppc64le GNU/Linux
ubuntu@tiselius:~$ 

ubuntu@tiselius:~$ apt policy gdb
gdb:
  Installed: 8.1-0ubuntu4
  Candidate: 8.1-0ubuntu4
  Version table:
 *** 8.1-0ubuntu4 500
500 http://ppa.launchpad.net/manjo/gdb-lp1830796/ubuntu bionic/main 
ppc64el Packages
100 /var/lib/dpkg/status
 8.1-0ubuntu3 500
500 http://ports.ubuntu.com/ubuntu-ports bionic/main ppc64el Packages
ubuntu@tiselius:~$ 


root@tiselius:/home/ubuntu# gdb /usr/lib/debug/boot/vmlinux-4.15.0-20-generic 
/proc/kcore 
GNU gdb (Ubuntu 8.1-0ubuntu4) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "powerpc64le-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/lib/debug/boot/vmlinux-4.15.0-20-generic...done.

warning: core file may not match specified executable file.
[New process 1]
Core was generated by `root=UUID=295f571b-b731-4ebb-b752-60aadc80fc1b ro 
console=hvc0'.
#0  0x in ?? ()
(gdb) p jiffies_64
$1 = 4294952364
(gdb)

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1830796] Re: [Bionic][ARM64]Failure debugging linux kernel

[Brian Murray]

Actually the version number used in the debdiff (8.1-0ubuntu4) had
already been uploaded to the archive and so it was rejected. This is
part of why
https://wiki.ubuntu.com/SecurityTeam/UpdatePreparation#Update_the_packaging
recommends appending a .1 to the package version number, which is what I
did.

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Brian Murray]

I've uploaded this to the SRU queue for Ubuntu 18.04 so it can be
reviewed by the SRU team.

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1830796] Re: [Bionic][ARM64]Failure debugging linux kernel

[Andrew Cloke]

Next step is for this patch to go into the bionic gdb SRU queue.

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Mathew Hodson]

** Also affects: gdb (Ubuntu Bionic)
   Importance: Undecided
   Status: New

** Changed in: gdb (Ubuntu Bionic)
   Status: New => In Progress

** Changed in: gdb (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: gdb (Ubuntu)
   Status: In Progress => Fix Released

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gdb in Ubuntu.
https://bugs.launchpad.net/bugs/1830796

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

Status in gdb package in Ubuntu:
  Fix Released
Status in gdb source package in Bionic:
  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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
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[Touch-packages] [Bug 1830796] Re: [Bionic][ARM64]Failure debugging linux kernel

[Manoj Iyer]

** Description changed:

  [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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.
+ The risk of regression after applying this patch could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

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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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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 could be to architectures 
other than ARM64 due to changes to gdb/util.c. Please see comment #2 where I 
have tested the PPA package on a ppc64el system and found it does not introduce 
any regressions.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Ubuntu Foundations Team Bug Bot]

The attachment "Fix tagged pointer support." seems to be a debdiff.  The
ubuntu-sponsors team has been subscribed to the bug report so that they
can review and hopefully sponsor the debdiff.  If the attachment isn't a
patch, please remove the "patch" flag from the attachment, remove the
"patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe
the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issue please contact him.]

** Tags added: patch

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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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Manoj Iyer]

** Description changed:

  [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'. 
+ 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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.
+ The risk of regression after applying this patch is low.

-- 
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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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Manoj Iyer]

== Testing on PPC64EL ==

ubuntu@tiselius:~$ apt policy gdb
gdb:
  Installed: 8.1-0ubuntu4
  Candidate: 8.1-0ubuntu4
  Version table:
 *** 8.1-0ubuntu4 500
500 http://ppa.launchpad.net/manjo/gdb-lp1830796/ubuntu bionic/main 
ppc64el Packages
100 /var/lib/dpkg/status
 8.1-0ubuntu3 500
500 http://ports.ubuntu.com/ubuntu-ports bionic/main ppc64el Packages
ubuntu@tiselius:~$

root@hotdog:~# gdb /usr/lib/debug/boot/vmlinux-4.18.0-20-generic  /proc/kcore 
GNU gdb (Ubuntu 8.1-0ubuntu4) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "aarch64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/lib/debug/boot/vmlinux-4.18.0-20-generic...done.

warning: core file may not match specified executable file.
[New process 1]
Core was generated by `BOOT_IMAGE=/boot/vmlinuz-4.18.0-20-generic 
root=UUID=edb5e5a7-8272-4e13-aa25-37'.
#0  0x in ?? ()
(gdb) p jiffies_64
$1 = 4406710034
(gdb)

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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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Manoj Iyer]

Test package is available in PPA:
ppa:manjo/gdb-lp1830796 

ubuntu@hotdog:~$ apt policy gdb
gdb:
  Installed: 8.1-0ubuntu4
  Candidate: 8.1-0ubuntu4
  Version table:
 *** 8.1-0ubuntu4 500
500 http://ppa.launchpad.net/manjo/gdb-lp1830796/ubuntu bionic/main 
arm64 Packages
100 /var/lib/dpkg/status
 8.1-0ubuntu3 500
500 http://ports.ubuntu.com/ubuntu-ports bionic/main arm64 Packages
ubuntu@hotdog:~$ 

root@hotdog:~# gdb /usr/lib/debug/boot/vmlinux-4.18.0-20-generic  /proc/kcore 
GNU gdb (Ubuntu 8.1-0ubuntu4) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "aarch64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/lib/debug/boot/vmlinux-4.18.0-20-generic...done.

warning: core file may not match specified executable file.
[New process 1]
Core was generated by `BOOT_IMAGE=/boot/vmlinuz-4.18.0-20-generic 
root=UUID=edb5e5a7-8272-4e13-aa25-37'.
#0  0x in ?? ()
(gdb) p jiffies_64
$1 = 4406710034
(gdb)

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gdb in Ubuntu.
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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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[Touch-packages] [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

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gdb in Ubuntu.
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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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

[Manoj Iyer]

** Changed in: gdb (Ubuntu)
   Status: New => In Progress

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gdb in Ubuntu.
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  0x in ?? ()
  (gdb) p jiffies_64
  Cannot access memory at address 0x09616980
  (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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions

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