== 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 <http://gnu.org/licenses/gpl.html>
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:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
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 0x0000000000000000 in ?? ()
(gdb) p jiffies_64
$1 = 4294952364
(gdb)
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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 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 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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