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[Xen-bugs] [Bug 168] New: kernel BUG at arch/xen/i386/kernel/pci-dma.c:3

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Subject:	[Xen-bugs] [Bug 168] New: kernel BUG at arch/xen/i386/kernel/pci-dma.c:30 (iommu_bug)!
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Date:	Tue, 16 Aug 2005 17:28:24 +0000
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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=168

           Summary: kernel BUG at arch/xen/i386/kernel/pci-dma.c:30
                    (iommu_bug)!
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: dbarrera@xxxxxxxxxx
                CC: hohnbaum@xxxxxxxxxx


On a couple of RHEL4/FC3 x86 boxes built with PAE 'on', the machines are
crashing with the following oops immediately after entering the command to
create a domain (xm create -c vm1.cfg). 

Fatal DMA error! Please use 'swiotlb=force'
kernel BUG at arch/xen/i386/kernel/pci-dma.c:30 (iommu_bug)!
 [<c010ea0b>] iommu_bug+0x3b/0x50
 [<c010eb6a>] dma_map_sg+0x14a/0x170
 [<c02f5023>] ide_map_sg+0xa3/0xb0
 [<c02fe86c>] ide_build_sglist+0x7c/0xd0
 [<c02fe8ff>] ide_build_dmatable+0x3f/0x190
 [<c02fedda>] ide_dma_setup+0x3a/0xe0
 [<c0301120>] __ide_do_rw_disk+0x3d0/0x5a0
 [<c02f6f00>] ide_wait_stat+0+30/0x230
 [<c02837fc>] as_move_to_dispatch+0xec/0x220
 [<c02f5550>] start_request+0x270/0x290
 [<c02f581c>] ide_do_request+0x27c/0x470
 [<c027940c>] elv_next_request+0x3c/0x1b0
 [<c02f5a34>] do_ide_request+0x24/0x30
 [<c027c62a>] generic_unplug_device+0x2a/0x70
 [<c027c600>] generic_unplug_device+0x0/0x70
 [<c02e74b6>] blkio_schedule+0x186/0x190
 [<c011e070>] default_wake_function+0x0/0x20
 [<c010a662>] ret_from_fork+0x6/0x14
 [<c011e070>] default_wake_function+0x0/0x20
 [<c02e7330>] blkio_schedule+0x0/0x190
 [<c0108615>] kernel_thread_helper+0x5/0x10
Kernel panic - not syncing: BUG!

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