Public bug reported:
[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.
** Affects: gdb (Ubuntu)
Importance: High
Assignee: Manoj Iyer (manjo)
Status: New
** Tags: cn99xx
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https://bugs.launchpad.net/bugs/1830796
Title:
[Bionic][ARM64]Failure debugging linux kernel
Status in gdb package in Ubuntu:
New
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1830796/+subscriptions
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