Waiting on "ATA request done" with the following non-sleepable locks held:

[Kris Kennaway]

One of my package build machines just spewed out a bunch of these:

 kernel: Waiting on "ATA request done" with the following non-sleepable locks held:
 kernel: exclusive sleep mutex g_xup r = 0 (0xce48bcbc) locked @ /a/asami/portbuild/i386/src-client/sys/geom/geom_io.c:393
 kernel: ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=2443880

Granted, this is a hardware error condition, but it looks like the
driver might not be handling it properly.

Kris
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