clang compiled kernel panic when mounting zfs root on i386

[Hans Petter Selasky]

On Thursday 20 December 2012 12:18:22 Volodymyr Kostyrko wrote:
> 18.12.2012 00:20, Andriy Gapon:
> > It's been already mentioned many times that ZFS works much better on
> > amd64. It's up to a (potential) user to understand limitations of i386
> > and to decide whether to use ZFS, in what situations and how.
> > 
> > You may want to consider using KSTACK_PAGES=4 in your kernel
> > configuration.
> 
> For last two fays my system seems stable on kernel compiled with
> KSTACK_PAGES=4 and WITH_CLANG_IS_CC.

Hi,

I've built a 10-current i386 kernel as of today, and I see double fault when 
USB audio is allocating memory. Anyone knows why?

I'm on #bsdusb on EF-net for 30 more minutes if someone has any quick 
suggestions.

kdb_enter()
vpanic()
panic()
dblfault_handler()
vm_map_lookup()
vm_fault_hold()
vm_fault()
vm_fault_wire()
vm_map_wire()
kmem_alloc_attr(xxx, 0x4000,2,0,0xffffffff)
bus_dmamem_alloc()
usb_pc_alloc_mem()

--HPS