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To: Lutz.Bichler@unibw-muenchen.de
From: "M. Warner Losh" <imp@bsdimp.com>
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cc: current@freebsd.org
Subject: Re: Detaching USB stick crashes BETA4/BETA5
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In message: <200409200959.48269.Lutz.Bichler@unibw-muenchen.de>
            Lutz Bichler <Lutz.Bichler@unibw-muenchen.de> writes:
: Hi,
: 
: i have a problem with my USB stick on 5.3 BETA4 and BETA5 which did not exist 
: in 5.2.1. Whenever i detach my USB stick FreeBSD crashes. I see the 
: following:
: 
: uhub3: at uhub1 port1 (addr 2) disconnected
: (da0:umass-sim0:0:0:0): lost device
: (da0:umass-sim0:0:0:0): removing device entry
: umass0: detached
: (null): at uhub3 port1 (addr3) disconnected
: 
: 
: Fatal trap 12: page fault while in kernel mode
: fault virtual address     = 0x400
: fault code                  = supervisor read, page not present
: instruction pointer       = 0x8:0xc04d5854
: stack pointer              = 0x10:0xcc726bd4
: frame pointer              = 0x10:0xcc726bd4
: code segment            = base 0x0, limit 0xfffff, type 0x1b
:                                 = DPL 0, pres 1, def32 1, gran 1
: processor eflags         = interrupt enabled, resume, IOPL = 0
: current process          = 40 (usb1)
: trap number               = 12
: panic: page fault
: 
: 
: This happens on an IBM X24 Laptop and a Fujitsu-Siemens Scenic 400 Desktop.

This may be my fault.  Any chance you can give me a traceback?

Warner