usb/84750: [hang] 6-BETA2 reboot/shutdown with root_fs on external HDD fails

[vwe at FreeBSD.org]

Synopsis: [hang] 6-BETA2 reboot/shutdown with root_fs on external HDD fails

State-Changed-From-To: open->feedback
State-Changed-By: vwe
State-Changed-When: Sun May 11 19:22:30 UTC 2008
State-Changed-Why: 

Ilya, can you please check if this is still an issue with latest
7-STABLE / 6-STABLE / 7.0-R / 6.3-R?
Also from taking a look at your dmesg, these lines 
ACPI: overriding DSDT/SSDT with custom table
    ACPI-0377: *** Info: Table [DSDT] replaced by host OS
acpi0: <A M I OEMRSDT> on motherboard
    ACPI-0356: *** Error: Region EmbeddedControl(3) has no handler
    ACPI-1304: *** Error: Method execution failed [\\_SB_.PCI0.SBRG.EC0_.ACS_] (Node 0xc1aaca60), AE_NOT_EXIST
    ACPI-1304: *** Error: Method execution failed [\\_SB_.AC__._INI] (Node 0xc1aac560), AE_NOT_EXIST
    ACPI-0356: *** Error: Region EmbeddedControl(3) has no handler
    ACPI-1304: *** Error: Method execution failed [\\_SB_.PCI0.SBRG.EC0_.BATS] (Node 0xc1aaca40), AE_NOT_EXIST
    ACPI-1304: *** Error: Method execution failed [\\_SB_.BAT0._STA] (Node 0xc1aaece0), AE_NOT_EXIST
    ACPI-0239: *** Error: Method execution failed [\\_SB_.BAT0._STA] (Node 0xc1aaece0), AE_NOT_EXIST

make me wonder if you're able to install a BIOS update as the machine
seems to have some ACPI issues.
Also I'm pretty sure booting off umass is working fine in general
as I'm tried it over the last weeks several times (but using mostly
USB memory sticks - several different brands and only one USB-HDD).

http://www.freebsd.org/cgi/query-pr.cgi?pr=84750