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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Date: Fri, 14 Nov 2008 09:12:10 +0100
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Cc: kevin <kevinxlinuz@163.com>, FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: kernel panic of usb2
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On Friday 14 November 2008, kevin wrote:
> Hi ,
>     i can't write anything in usb flash devices.i can mount device well
> with usb2_storage_mss.
> db>bt
> Tracing pid 1367 tid 100147 td 0xffffff0004e756e0
> kdb_enter() at kdb_enter+0x3d
> panic() at panic+0x176
> vm_pfault() at vm_pfault+0x19ce
> trap_pfault() at trap_pfault+0x2a9
> trap() at trap+0c327
> calltrap()  at calltrap+0x8
> --- trap 0xc, rip = 0xffffffff80511166, rsp = 0xfffffffee962bac0, rdp =
> 0xffffff
> fee962bb00 ---
> bcopy() at bcopy+0x16
> usb2_bdma_per_sync() at usb2_bdma_per_sync+0x35
> usb2_bdma_work_loop() at usb2_bdma_work_loop+0x346
> usb2_command_wrapper() at usb2_command_wrapper+0x76
> usb2_callback_wrapper() at usb2_callback_wrapper+0x2d4
> usb2_command_wrapper() at usb2_command_wrapper+0x76
> usb2_callback_proc() at usb2_callback_proc+0x90
> usb2_process() at usb2_process+0xd2
> fork_exit() at fork_exit+0x118
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip =0, rsp=0xfffffffee962bd40,  rbp = 0 ---
>

This issue has been fixed, but not in -current yet.

See:

http://perforce.freebsd.org/chv.cgi?CH=152624

--HPS