Why does Xen kernel panic while normal kernel works fine?

Solution Verified - Updated -

Issue

  • Xen kernel refuses to boot and giving kernel panic message pasted below.

    Call Trace:
 [<ffffffff80277a89>] pci_swiotlb_init+0x9/0x2d
 [<ffffffff806b1b3e>] mem_init+0x13/0x1e8
 [<ffffffff806a6a79>] start_kernel+0x189/0x224
 [<ffffffff806a61e5>] _sinittext+0x1e5/0x1eb

Code: 0f 0b 68 d0 f8 4a 80 c2 a0 00 48 83 eb 80 48 8b 05 76 9e 45
RIP  [<ffffffff8034c57d>] swiotlb_init_with_default_size+0xa0/0x19e
 RSP <ffffffff8069df40>
 <0>Kernel panic - not syncing: Fatal exception

Regular kernel boots fine. Tried upgrading kernel, but problem persists.

Environment

  • Red Hat Enterprise Linux 5.x
  • kernel-xen

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