Re: "Fatal trap" when unloading usb2_controller_ehci

On Sunday 08 February 2009 4:26:20 am Hans Petter Selasky wrote:
> Hi,
> 
> I don't think this is a USB problem. I rather think it has something to do  
> with the IRQ handler. On my box the EHCI IRQ is shared with the IRQ of the 
> graphics adapter, and when I unload the EHCI driver under X11 a couple of 
> times X11 freezes. This does not happen on the console.

Perhaps try reverting Jeff's per-CPU IDT changes to see if it is related to 
that?  It seems that the IDT handler was torn down, but that an APIC IRQ 
wasn't masked or some such.

> --HPS
> 
> On Sunday 08 February 2009, Bruce Cran wrote:
> > Unloading usb2_controller_ehci is crashing FreeBSD on -CURRENT
> > from a few days ago, resulting in a "Fatal trap" that isn't immediately
> > fatal but ends up knocking out the rest of the system.
> >
> > Shortly after issuing a kldunload, the kernel drops into DDB with:
> >
> > Fatal trap 30: reserved (unknown) fault while in kernel mode
> > cpuid = 0; apic id = 00
> > instruction pointer = 0x8 : 0xffffffff804bc646
> > stack pointer       = 0x10: 0xfffffffe40023b70
> > frame pointer       = 0x10: 0xfffffffe40023b80
> > code segment        = base 0x0, limit 0xfffff, type 0x1b
> > processor eflags    = interrupt enabled, IOPL = 0
> > current process     = 11 (idle : cpu0)
> > [thread pid 11 tid 100004]
> > Stopped at acpi_cpu_c1+0x6 : leave
> >
> > A backtrace just shows that the idle task was running at the time of
> > the trap.  Attempting to continue results in a load of "calcru: runtime
> > went backwards" messages followed by the ATA driver dying with:
> >
> > WARNING - SETFEATURES SET TRANSFER MODE taskqueue timeout - completing
> > request directly
> >
> > Then follows similar messages about SET_MULTI, ENABLE RCACHE,
> > ENABLE_WCACHE and WRITE_DMA48 etc.
> 
> 
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-- 
John Baldwin