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From: "R.Mahmatkhanov" <cvs-src@yandex.ru>
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Cc: freebsd-usb@freebsd.org
Subject: Re: Panic on post-freeze current with ucom
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> In message: <4678D5FA.000001.31958@pantene.yandex.ru>
>             "R.Mahmatkhanov" <cvs-src@yandex.ru> writes:
> : >In message: <46790374.8040903@yandex.ru>
> : >            "R.Mahmatkhanov" <cvs-src@yandex.ru> writes:
> : >: Good Day.
> : >: 
> : >: I just move to latest -current/i386 after the code freeze. And i catch
> : >: 100% reproduceble panic condition. It happens when i plug my mobile
> : >: phone to USB port. How it does:
> : >: 
> : >: ucom0: <CURITEL Incorporated CURITEL HX-550C USB Modem, class 2/0, rev
> : >: 1.10/0.00, addr 2> on uhub1
> : >: Fatal trap 12: page fault while in kernel mode cpuid = 0; apic id = 00
> : >: fault virtual address = 0x4
> : >: fault code = supervisor read, page not present
> : >: instruction pointer = 0x20: 0xc06ca396
> : >: stack pointer = 0x28: 0xdd30a760
> : >: frame pointer = 0x28: 0xdd30a760
> : >: 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 = 28 (usb1)
> : >: [thread pid 28 tid 100023]
> : >: Stopped at usb_get_interface_descruptor+0x6: movl 0x4(%eax), %eax
> : >
> : >This looks like a null modem dereference.  Which driver is causing
> : >this?
> : >
> : >Warner
> : 
> : It's umodem.
> doh!
> Consider applying

It's now working again! Thank you much!

> Index: umodem.c

>  
> and letting me know the results.
> Warner