[Bug 167685] ZFS on USB drive prevents shutdown / reboot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=167685

John F. Carr <jfc@mit.edu> changed:

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                 CC|                            |jfc@mit.edu

--- Comment #13 from John F. Carr <jfc@mit.edu> ---
Please reopen.  I am seeing this bug today on 13.2-STABLE.  I have a ZFS pool
using five disks in a Sabrent enclosure.  In terms of drivers,

uhub5 on uhub0
uhub5: <VIA Labs, Inc. USB3.1 Hub, class 9/0, rev 3.20/90.13, addr 1> on usbus0
uhub5: 4 ports with 4 removable, self powered
usb_msc_auto_quirk: UQ_MSC_NO_GETMAXLUN set for USB mass storage device ASMT
ASM235CM (0x174c:0x55aa)
ugen0.3: <ASMT ASM235CM> at usbus0
umass0 on uhub5
umass0: <ASMT ASM235CM, class 0/0, rev 3.10/1.00, addr 2> on usbus0
umass0:  SCSI over Bulk-Only; quirks = 0x0100
umass0:20:0: Attached to scbus20
da0 at umass-sim0 bus 0 scbus20 target 0 lun 0
da0: <ASMT ASM235CM 0> Fixed Direct Access SPC-4 SCSI device
da0: Serial Number 915000000C05
da0: 400.000MB/s transfers
da0: 5723166MB (11721045168 512 byte sectors)
da0: quirks=0x2<NO_6_BYTE>

Other devices appear as

uhub6 on uhub5
umass1 on uhub6 [= da1]
umass2 on uhub6 [= da2]
umass3 on uhub6 [= da3]
umass4 on uhub6 [= da4]

I infer the enclosure has a hub connected to a disk and a second hub. The
second hub has the other 4 disks.

When I reboot the system I see (retyped from photo)

All buffers synced.
Uptime: 3d3h57m14s
uhub0: detached
ukbd0: detached
...
umass0: detached
umass1: detached
Solaris: WARNING: Pool 'sabrent' has encountered an uncorrectable I/O failure
and has been suspended.

Then the system hangs.  Within the not especially long limit of my patience
there is no more output.  No detach message for uhub5, uhub6, umass2, umass3,
and umass4.

I have failmode=continue on this pool precisely to avoid having the system
hang.  There might be two bugs, shutdown order and failure to respect
failmode=continue.

This is repeatable.

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