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Re: kern/51524

The following reply was made to PR kern/51524; it has been noted by GNATS.

From: Tom Ivar Helbekkmo <>
Subject: Re: kern/51524
Date: Mon, 03 Oct 2016 17:35:44 +0200

 I observe the same problem under 7.99.39.  It's been like this at least
 since 7.99.36, on both i386 and amd64, but was working well under 7.99.7
 on i386, at least.
 I believe the manifestation of the problem on my amd64 system shows a
 pattern: the USB subsystem will get hung up the second time the USB
 serial device is opened, requiring a hardware forced reboot to recover.
 I may be mistaken; it's behaved this way three or four times in a row
 during testing with 7.99.39, but this still could be a coincidence.
 I test using a small application I wrote to decode data coming in from
 the Tellstick, but opening the port with kermit has the same result.
 The relevant kernel output for the device:
 ehci0 at pci0 dev 26 function 0: vendor 8086 product 3b3c (rev. 0x06)
 ehci0: interrupting at ioapic0 pin 16
 ehci0: EHCI version 1.0
 usb0 at ehci0: USB revision 2.0
 uhub0 at usb0: vendor 8086 EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
 uhub0: 2 ports with 2 removable, self powered
 uhub2 at uhub0 port 1: vendor 8087 product 0020, class 9/0, rev
 2.00/0.00, addr 2
 uhub2: single transaction translator
 uhub2: 6 ports with 6 removable, self powered
 uftdi0 at uhub2 port 4
 uftdi0: Telldus TellStick Duo, rev 2.00/6.00, addr 10
 ucom0 at uftdi0 portno 1

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