[issue947] Kernel panic during boot in usb_add_task

[Matthew Dillon]

:New submission from Michael Neumann <mneumann at ntecs.de>:
:
:I tried my brand new HP Compaq laptop 6710b under DragonFly, but during boo=
:ting
:the installer CD it "throws" a page fault:
:
:  uhub0: 2 ports ...
:  uhub0: <Intel UHCI root hub, ...>
:
:  Fatal trap 12: page fault while in kernel mode
:  fault virtual address =3D 0x0
:  fault code            =3D supervisor write, page not present
:  instruction pointer   =3D 0x8:0xc04a9c5c
:  stack pointer         =3D 0x10:0xc25f8d38
:  frame pointer         =3D 0x10:0xc25f8d48
:  code segment          =3D base 0x0, limit 0xfffff, type 0x1b
:                        =3D DPL 0, pres 1, def32 1, gram 1
:  processor eflags      =3D interrupt enabled, resume, IOPL =3D 0
:  current process       =3D Idle
:  current thread        =3D pri 46 (CRIT)
:
:  kernel: type 12, code=3D2
:  stopped at       usb_add_task+0x4c:    movl     %edi,0(%eax)
:
:
:This happens with the latest snapshot version as of yesterday and also with=
: the
:1=2E10 release.
:
:FreeBSD 7.0-BETA3 silently hangs during boot, while NetBSD 4.0RC_4 works li=
:ke a
:charm (it can even dual-boot windows natively)!=20
:
:There exists a thread on dragonfly.kernel named "Kernel panic during boot in
:usb_add_task" about this issue.

    Can you do a traceback ?  The 'trace' command from the DDB prompt,
    I believe.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>