Re: port-i386/57662: StarTech ICUSB23208FD 8-Port USB-to-Serial Adapter Hub fails on Alix with NetBSD/i386 9.3

[Alexander Schreiber <als%thangorodrim.ch@localhost>]

The following reply was made to PR port-i386/57662; it has been noted by GNATS.

From: Alexander Schreiber <als%thangorodrim.ch@localhost>
To: Taylor R Campbell <riastradh%netbsd.org@localhost>
Cc: matthew green <mrg%eterna.com.au@localhost>, port-i386-maintainer%netbsd.org@localhost,
	gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
	gnats-bugs%netbsd.org@localhost
Subject: Re: port-i386/57662: StarTech ICUSB23208FD 8-Port USB-to-Serial
 Adapter Hub fails on Alix with NetBSD/i386 9.3
Date: Sun, 29 Oct 2023 22:14:32 +0100

 On Sat, Oct 28, 2023 at 09:29:09PM +0000, Taylor R Campbell wrote:
 > > Date: Sat, 28 Oct 2023 22:26:06 +0200
 > > From: Alexander Schreiber <als%thangorodrim.ch@localhost>
 > > 
 > > Both patches applied and things do look better. Now, instead of hanging
 > > forever, after the second (so, at the third) connection attempt, cu
 > > errors out with: "cu: link down" after a few seconds. This behavior then
 > > sticks.
 > > 
 > > Relevant snippet from the trace:
 > > 
 > >   1699   1699 cu       0.000010616 CALL  open(0xbfb9a56e,6,0)
 > >   1699   1699 cu       0.000011733 NAMI  "/dev/ttyU1"
 > >   1699   1699 cu       11.991814027 RET   open -1 errno 5 Input/output error
 > > 
 > > vmstat usbhist dump at:
 > > 
 > > https://www.thangorodrim.ch/tmp/NetBSD10BETA_serial_vmstat-usbhist_patch-1
 > 
 > Great, thanks!  So we've fixed the logic to abort on timeout that I
 > broke last year (which is good!), but now we have to figure out why
 > the transfer is timing out at all.
 
 Small update: I rebuilt the kernel (stripped out a lot of unneeded stuff
 from the config to get build time down and enable DIAGNOSTICS) and redid
 the test. Now, while cu hangs, I see matching complaints in dmesg:
 
 [ 394.1174957] ehci_sync_hc: timed out
 [ 400.1176959] ehci_sync_hc: timed out
 [ 406.1178962] ehci_sync_hc: timed out
 
 and then cu comes back with "cu: link down". I didn't see those kernel
 messages before, so I guess that is courtesy of DIAGNOSTICS.
 
 Kind regards,
            Alex.
 -- 
 "Opportunity is missed by most people because it is dressed in overalls and
  looks like work."                                      -- Thomas A. Edison