Ubuntu
gdb package

  1. Bug #1830796
  2. Comment #0

Comment 0 for bug 1830796

Revision history for this message
Manoj Iyer (manjo) wrote :

[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.