RE: [Xen-devel] Daily Xen Builds

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> >I can't see why creating a domU would be helped by a swiotlb. 
> >
> Without it, dom0 crashes. I reported on Bugzilla #168 a 
> couple of days ago the following crash when creating a domU 
> on machines built with PAE:
> 
> 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!
> 
> >Precisely which adaptec card is it, what driver?
> >  
> SCSI storage controller: Adaptec AIC-7901 U320 (rev 10)

This backtrace looks like its doing ide transfers. Have you got active
ide devices in this system?

Also, please can you rerun this test as the debugging output has been
improved.


Thanks,
Ian

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