Date: Fri, 29 Jul 2005 18:18:55 -0700 From: "Frank Mayhar" <frank@exit.com> To: "FreeBSD gnats submit" <FreeBSD-gnats-submit@FreeBSD.org> Subject: kern/84326: Panic trying to connect SCSI tape drive via USB converter. Message-ID: <1122686335.0@realtime.exit.com> Resent-Message-ID: <200507300120.j6U1KMvF001101@freefall.freebsd.org>
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>Number: 84326
>Category: kern
>Synopsis: Panic trying to connect SCSI tape drive via USB converter.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Jul 30 01:20:22 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Frank Mayhar
>Release: FreeBSD 5.4-STABLE i386
>Organization:
Exit Consulting
>Environment:
System: FreeBSD 5.4-STABLE #6: Mon Jul 25 11:50:48 PDT 2005
frank@realtime.exit.com:/usr/obj/usr/src/sys/REALTIME
Pretty standard dual-athlon system, 1.5G, LSI Logic SCSI, not relevant
to this issue. USB probes and attaches thusly:
ohci1: <NEC uPD 9210 USB controller> mem 0xe8205000-0xe8205fff irq 16 at device 4.0 on pci4
usb1: OHCI version 1.0
usb1: <NEC uPD 9210 USB controller> on ohci1
usb1: USB revision 1.0
uhub1: NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
ohci2: <NEC uPD 9210 USB controller> mem 0xe8206000-0xe8206fff irq 17 at device 4.1 on pci4
usb2: OHCI version 1.0
usb2: <NEC uPD 9210 USB controller> on ohci2
usb2: USB revision 1.0
uhub2: NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ehci0: <NEC uPD 720100 USB 2.0 controller> mem 0xe8209000-0xe82090ff irq 18 at device 4.2 on pci4
usb3: EHCI version 0.95
usb3: companion controllers, 3 ports each: usb1 usb2
usb3: <NEC uPD 720100 USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: NEC EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub3: 5 ports with 5 removable, self powered
uhub4: Belkin Components product 0x0234, class 9/0, rev 2.00/1.00, addr 2
uhub4: single transaction translator
uhub4: 4 ports with 4 removable, self powered
>Description:
Trying to connect a SCSI tape drive (an HP DLT 4000) via a Belkin
USB<->SCSI translator results in near-instant panic with an integer
divide fault. This is unfriendly.
I analyzed the crash a bit and it looks like CAM is identifying the device
as a da-type, as the panic is via dadone(), which eventually causes
cam_calc_geometry() to fall over itself trying to calculate geometry using
garbage values for sec_size and volume_size. Here's the traceback, btw:
#22 0xc0633073 in __qdivrem (uq=Unhandled dwarf expression opcode 0x93
) at /usr/src/sys/libkern/qdivrem.c:97
#23 0xc06334be in __udivdi3 (a=1801810543, b=0)
at /usr/src/sys/libkern/udivdi3.c:47
#24 0xc042f166 in cam_calc_geometry (ccg=0xe6f0b8f8, extended=1)
at /usr/src/sys/cam/cam.c:376
#25 0xc0497442 in umass_cam_action (sim=0xc2ff3dc0, ccb=0xe6f0b8f8)
at /usr/src/sys/dev/usb/umass.c:2580
#26 0xc04332e2 in xpt_action (start_ccb=0xe6f0b8f8)
at /usr/src/sys/cam/cam_xpt.c:3076
#27 0xc043fab9 in dasetgeom (periph=0x0, block_len=0, maxsector=1801810542)
at /usr/src/sys/cam/scsi/scsi_da.c:1741
#28 0xc043f3c2 in dadone (periph=0xc4b17900, done_ccb=0xc2f5d000)
at /usr/src/sys/cam/scsi/scsi_da.c:1395
#29 0xc0436885 in camisr (V_queue=0xc06a1200)
at /usr/src/sys/cam/cam_xpt.c:7074
#30 0xc04d7919 in ithread_loop (arg=0xc2c2bd00)
at /usr/src/sys/kern/kern_intr.c:547
#31 0xc04d69b5 in fork_exit (callout=0xc04d77c0 <ithread_loop>,
arg=0xc2c2bd00, frame=0xe6f0bd38) at /usr/src/sys/kern/kern_fork.c:791
#32 0xc0613e1c in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:209
Most of this traceback is a red herring, though, since I suspect the real
problem is identifying an sa as a da. Someone with more knowledge of
this subsystem will have to take it further, though.
I have the dump online and can provide any further information you
require, just let me know.
>How-To-Repeat:
Do what I did.
>Fix:
I wish.
>Release-Note:
>Audit-Trail:
>Unformatted:
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