Hello,

on a current (3.99.3) i386 system, while extracting binary sets to FFS
on a USB flash drive, the write process (I used tar and pax) often hangs
for several minutes (sometimes up to ten) at random places; ps reports
state `D'. The system in use:

ehci0 at pci0 dev 16 function 3: VIA Technologies VT8237 EHCI USB Controller (rev. 0x82)
ehci0: interrupting at irq 3
ehci0: EHCI version 1.0
ehci0: companion controllers, 2 ports each: uhci0 uhci1 uhci2
usb3 at ehci0: USB revision 2.0
uhub3 at usb3
uhub3: VIA Technologie EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub3: single transaction translator
uhub3: 6 ports with 6 removable, self powered
[...]
umass0 at uhub3 port 4 configuration 1 interface 0
umass0: vendor 0x1005 USB Flash Drive, rev 2.00/1.00, addr 2
umass0: using SCSI over Bulk-Only
scsibus0 at umass0: 2 targets, 1 lun per target
sd0 at scsibus0 target 0 lun 0: <USB, Flash Drive, 2.04> disk removable
sd0: 247 MB, 6349 cyl, 16 head, 5 sec, 512 bytes/sect x 507901 sectors

Nothing is printed to the console, and finally the write process continues.

This is quite reproducible so far: while extracting base.tgz, it happens
almost ever exactly once.

If I disable ehci with userconf, this problem does not exist.

While writing this, I issued a 'ktrace tar -x ...', and the problem
happened again. But this time I got

	umass0: at uhub3 port 4 (addr 2) disconnected
	sd0(umass0:0:0:0): generic HBA error

and it hangs now since definitely more than ten minutes... The trace
file is 160 MB and doesn't change in size anymore.

Any hints?


Regards, Jukka

-- 
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