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Author SHA1 Message Date
Bhupesh Sharma
00da17176d kexec: fix for "Unhandled rela relocation: R_X86_64_PLT32" error
Resolves: bz1619122
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1619122

This patch fixes the "Unhandled rela relocation: R_X86_64_PLT32" error
that we are seeing with Fedora 29 (and newer kernels > 4.18) which
trying to run kexec/kdump on x86_64 machines.

The patch is being discussed upstream and has been ACK'ed by Baoquan and
myself (see <https://www.spinics.net/lists/kexec/msg21255.html>) and I
have also tested the same on Fedora 29/rawhide x86_64 machine as well:

Before the patch:
----------------
[root@hp-bl480c-01 ~]# kdumpctl restart
  kexec: unloaded kdump kernel
  Stopping kdump: [OK]
  Unhandled rela relocation: R_X86_64_PLT32
  kexec: failed to load kdump kernel
  Starting kdump: [FAILED]

After the patch:
---------------
[root@hp-bl480c-01 ~]# kdumpctl restart
  kexec: unloaded kdump kernel
  Stopping kdump: [OK]
  kexec: loaded kdump kernel
  Starting kdump: [OK]

Suggested Upstream Fix:

    In response to a change in binutils, commit b21ebf2fb4c
    (x86: Treat R_X86_64_PLT32 as R_X86_64_PC32) was applied to
    the linux kernel during the 4.16 development cycle and has
    since been backported to earlier stable kernel series. The
    change results in the failure message in $SUBJECT when
    rebooting via kexec.

    Fix this by replicating the change in kexec.

    Signed-off-by: Chris Clayton <chris2553@googlemail.com>

Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
Acked-by: Kairui Song <kasong@redhat.com>
2018-08-22 15:48:43 +08:00