DMA: Out of SW-IOMMU Space

Source: Internet
Author: User

Scenario: You need to redeploy the IO of the entire system.

When invention a lot of I/O, the xen dom0 kernel crashes with

Following Error:

[325.437727] Console [netcon0] Enabled

[2, 325.437795] netconsole: Network logging started

[1076.017245] mpt2sas. 0: DMA: Out of SW-IOMMU space

32768 bytes.

[1076.017333] bug: unable to handle kernel Null Pointer Dereference


[1076.017517] IP: [<ffffffa00668d8>] _ scsih_qcmd + 0x408/0 x4d4 [mpt2sas]

[1076.017618] PGD b169067 pud 1b85a067 PMD 0

[1076.017766] Oops: 0000 [#1] SMP

[2, 1076.017891] Last sysfs file:/sys/module/configfs/refcnt

[1076.017945] CPU 2

[1076.018023] modules linked in: netconsole configfs xen_evtchn xenfs

DMA: Out of SW-IOMMU Space

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