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Re: kern/22218 (using a USB isochronous endpoint freezes kernel)

The following reply was made to PR kern/22218; it has been noted by GNATS.

From: "Jared D. McNeill" <>
Subject: Re: kern/22218 (using a USB isochronous endpoint freezes kernel)
Date: Wed, 8 Oct 2008 14:18:58 -0400 (EDT)

 On Wed, 8 Oct 2008, Thomas Runge wrote:
 > I kept the app running for a few days. This works quite nicely, as long,
 > as there is no activity on this system. When I start a cvs update, the
 > kernel will panic soon. This is my latest stacktrace:
 > ugen_isoc_rintr(c1079100,c6e41374,0,1,0,e500,15c0,4,3c1,4) at 
 > netbsd:ugen_isoc_rintr+0x56
 > usb_transfer_complete(c1079100,15c0,20,a,3,c6e41380,c6509520,0,0,0) at 
 > netbsd:usb_transfer_complete+0xba
 > ohci_softintr(c6509524,0,30,c63b0010,c63c0010,0,1fc7be0,c0e9f080,0,c63bbda0) 
 >  at netbsd:ohci_softintr+0x543
 > softint_dispatch(c74adae0,4,0,0,0,0,c63bbd90,c63bbbd8,c63bbc30,28) at 
 > netbsd:softint_dispatch+0x7c
 > DDB lost frame for netbsd:Xsoftintr+0x3d, trying 0xc63bbd88
 > Xsoftintr() at netbsd:Xsoftintr+0x3d
 > ---  interrupt  ---
 > fatal page fault in supervisor mode
 > trap type 6 code 0 eip c052f6f7 cs 8 eflags 10202 cr2 3c ilevel 8
 > kernel: supervisor trap page fault, code=0
 > Faulted in DDB;  continuing...
 > db{0}>
 This looks identical to an issue I'm seeing with a USB ATSC tuner and 
 ehci(4). I suspect the ehci isoc code was based on the ohci and uhci 
 implementations.. are you able to try this camera on a uhci to see if you 
 can reproduce the same crash there?

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