Multiple RHEL6 guests often crash due to memory corruptions after migrating those guests from RHEL6 KVM host to RHEL7.7 KVM host.

Issue

• Multiple RHEL6 guests often crash due to memory corruptions after migrating those guests from RHEL6 KVM host to RHEL7.7 KVM host.

     RELEASE: 2.6.32-754.35.1.el6.x86_64
       PANIC: "BUG: unable to handle kernel paging request at ffffb78eeda94f0b"

PID: 4228   TASK: ffff8800101cb520  CPU: 1   COMMAND: "cat"
    ...
    [exception RIP: s_show+213]
    RIP: ffffffff81188535  RSP: ffff8801c243bd68  RFLAGS: 00010046
    RAX: ffff88021fc215c0  RBX: 0000000000000051  RCX: ffff88021fc21600
    RDX: 0000000000000000  RSI: ffffb78eeda94eeb  RDI: ffff88021fc215d0
    RBP: ffff8801c243bde8   R8: 0000000000000004   R9: 0000000000000004
    R10: ffffffff817d726d  R11: 0000000000000004  R12: 0000000000000144
    R13: 0000000000000000  R14: 0000000000000dd2  R15: 0000000000000000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #9 [ffff8801c243bdf0] seq_read at ffffffff811c943d
#10 [ffff8801c243be70] proc_reg_read at ffffffff8120faf0
#11 [ffff8801c243bec0] vfs_read at ffffffff811a3447
    ...

     RELEASE: 2.6.32-754.35.1.el6.x86_64
       PANIC: "general protection fault: 0000 [#1] SMP "

PID: 21684  TASK: ffff8800be415520  CPU: 0   COMMAND: "java"
    ...
    [exception RIP: vring_interrupt+25]
    RIP: ffffffffa0054369  RSP: ffff880028203e48  RFLAGS: 00010096
    RAX: 9480000000000000  RBX: ffff880215a434a3  RCX: 0000000000000000
    RDX: 0000000000000078  RSI: ffff880215a434a3  RDI: 000000000000000b
    RBP: ffff880028203e58   R8: ffff88015dc28000   R9: ffff88015dc2bf18
    R10: 0000000000000000  R11: 0000000000000001  R12: 0000000000000000
    R13: ffff8802167d8678  R14: 000000000000000b  R15: 0000000000000001
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #6 [ffff880028203e60] vp_vring_interrupt at ffffffffa005b7a3 [virtio_pci]
 #7 [ffff880028203eb0] vp_interrupt at ffffffffa005b842 [virtio_pci]
 #8 [ffff880028203ed0] handle_IRQ_event at ffffffff810f9666
 #9 [ffff880028203f20] handle_fasteoi_irq at ffffffff810fc1b8
#10 [ffff880028203f50] handle_irq at ffffffff8100e5da
#11 [ffff880028203f80] do_IRQ at ffffffff8156878c
--- <IRQ stack> ---
    ...

     RELEASE: 2.6.32-754.35.1.el6.x86_64
       PANIC: "BUG: unable to handle kernel NULL pointer dereference at (null)"

PID: 12418  TASK: ffff880219556ab0  CPU: 2   COMMAND: "cat"
    ...
    [exception RIP: s_show+228]
    RIP: ffffffff81188544  RSP: ffff8802191dfd68  RFLAGS: 00010082
    RAX: ffff88021fc217c0  RBX: 0000000000000032  RCX: ffff88021fc21800
    RDX: 0000000000000000  RSI: 0000000000000000  RDI: ffff88021fc217d0
    RBP: ffff8802191dfde8   R8: 0000000000000001   R9: 0000000000000001
    R10: ffffffff817d726d  R11: 0000000000000004  R12: 0000000000000032
    R13: ffffffff817d726d  R14: 0000000000000c26  R15: 0000000000000000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #9 [ffff8802191dfdf0] seq_read at ffffffff811c943d
#10 [ffff8802191dfe70] proc_reg_read at ffffffff8120faf0
#11 [ffff8802191dfec0] vfs_read at ffffffff811a3447
    ...