May not be related to the webcam afterall.  Just leaving the machine
idling for a few minutes after boot I get another panic:

panic: pool_do_get: dwc2qtd free list modified: page 0xffffff80042fe000; item 
addr 0xffffff80042fe070; offset 0x0=0xdead4100
Stopped at      panic+0x158:        TID    PID    UID     PRFLAGS     PFLAGS  
CPU  COMMAND
db_enter() at panic+0x154
panic() at pool_get+0x54
pool_get() at dwc2_hcd_urb_enqueue+0x94
dwc2_hcd_urb_enqueue() at dwc2_device_start+0x3c4
dwc2_device_start() at usb_transfer_complete+0x2ec
usb_transfer_complete() at dwc2_softintr+0x74
dwc2_softintr() at softintr_dispatch+0xa0
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb> 

Paul 'WEiRD' de Weerd

On Fri, Jun 09, 2017 at 10:39:45AM +0200, Paul de Weerd wrote:
| I'm getting a panic when trying to use fswebcam to grab an image from
| my webcam on a Raspberry Pi 3:
| 
| panic: kernel diagnostic assertion "xfertype != UE_ISOCHRONOUS || 
xfer->nframes < DWC2_MAXISOCPACKETS" failed: file 
"/usr/src/sys/dev/usb/dwc2/dwc2.c", line 1306
| Stopped at      panic+0x158:        TID    PID    UID     PRFLAGS     PFLAGS  
CPU  COMMAND
| *502853  41556      0         0x3          0    0  fswebcam
| db_enter() at panic+0x154
| panic() at dwc2_device_start+0x45c
| dwc2_device_start() at usbd_transfer+0x140
| usbd_transfer() at uvideo_vs_start_isoc+0x78
| uvideo_vs_start_isoc() at uvideo_streamon+0xb0
| uvideo_streamon() at VOP_IOCTL+0x3c
| VOP_IOCTL() at vn_ioctl+0x70
| https://www.openbsd.org/ddb.html describes the minimum info required in bug
| reports.  Insufficient info makes it difficult to find and fix bugs.
| ddb> 
| 
| Unfortunately, I seem to be having some issues with my serial console
| cable, as I can't type on the console anymore (I still get output, but
| it doesn't take input).
| 
| I'll try to get that sorted and report with more details.
| 
| Cheers,
| 
| Paul 'WEiRD' de Weerd
| 
| OpenBSD 6.1-current (GENERIC) #0: Tue Jun  6 17:36:34 AEST 2017               
  
|     [email protected]:/usr/src/sys/arch/arm64/compile/GENERIC              
   
| real mem  = 961036288 (916MB)           
| avail mem = 905613312 (863MB)           
| mainbus0 at root: Raspberry Pi 3 Model B Rev 1.2                              
  
| cpu0 at mainbus0: ARM Cortex-A53 r0p4   
| simplefb0 at mainbus0: 656x416          
| wsdisplay0 at simplefb0 mux 1           
| wsdisplay0: screen 0 added (std, vt100 emulation)                             
  
| simplebus0 at mainbus0: "soc"           
| bcmintc0 at simplebus0                  
| bcmdog0 at simplebus0                   
| pluart0 at simplebus0                   
| com0 at simplebus0: ns16550, no working fifo                                  
  
| com0: console       
| dwctwo0 at simplebus0                   
| agtimer0 at simplebus0: tick rate 19200 KHz                                   
  
| simplebus1 at mainbus0: "clocks"        
| usb0 at dwctwo0: USB revision 2.0       
| uhub0 at usb0 configuration 1 interface 0 "Broadcom DWC2 root hub" rev 
2.00/1.00 addr 1
| uhub1 at uhub0 port 1 configuration 1 interface 0 "Standard Microsystems 
product 0x9514" rev 2.00/2.00 addr 2
| smsc0 at uhub1 port 1 configuration 1 interface 0 "Standard Microsystems 
SMSC9512/14" rev 2.00/2.00 addr 3
| smsc0: address b8:27:eb:93:42:d5        
| ukphy0 at smsc0 phy 1: Generic IEEE 802.3u media interface, rev. 3: OUI 
0x0001f0, model 0x000c
| umass0 at uhub1 port 2 configuration 1 interface 0 "SanDisk Ultra Fit" rev 
2.10/1.00 addr 4
| umass0: using SCSI over Bulk-Only       
| scsibus0 at umass0: 2 targets, initiator 0                                    
  
| sd0 at scsibus0 targ 1 lun 0: <SanDisk, Ultra Fit, 1.00> SCSI4 0/direct 
removable serial.07815583320220107303
| sd0: 29327MB, 512 bytes/sector, 60062500 sectors                              
  
| uvideo0 at uhub1 port 4 configuration 1 interface 0 "vendor 0x046d Webcam 
C170" rev 2.00/28.25 addr 5
| video0 at uvideo0   
| uaudio0 at uhub1 port 4 configuration 1 interface 2 "vendor 0x046d Webcam 
C170" rev 2.00/28.25 addr 5
| uaudio0: audio rev 1.00, 2 mixer controls                                     
  
| audio0 at uaudio0   
| urtwn0 at uhub1 port 5 configuration 1 interface 0 "Realtek 802.11n NIC" rev 
2.00/0.00 addr 6
| urtwn0: MAC/BB RTL8188EU, RF 6052 1T1R, address ec:08:6b:07:c2:1c             
  
| vscsi0 at root      
| scsibus1 at vscsi0: 256 targets         
| softraid0 at root   
| scsibus2 at softraid0: 256 targets      
| bootfile: sd0a:/bsd 
| boot device: sd0    
| root on sd0a (59de83c8e783b811.a) swap on sd0b dump on sd0b                   
  
| 
| 
| -- 
| >++++++++[<++++++++++>-]<+++++++.>+++[<------>-]<.>+++[<+
| +++++++++++>-]<.>++[<------------>-]<+.--------------.[-]
|                  http://www.weirdnet.nl/                 
| 

-- 
>++++++++[<++++++++++>-]<+++++++.>+++[<------>-]<.>+++[<+
+++++++++++>-]<.>++[<------------>-]<+.--------------.[-]
                 http://www.weirdnet.nl/                 

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