Re: CVS commit: src/sys/uvm

["J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>]

On Sep 29, 2011, at 12:52 AM, Matt Thomas wrote:

> Module Name:  src
> Committed By: matt
> Date:         Wed Sep 28 22:52:16 UTC 2011
> 
> Modified Files:
>       src/sys/uvm: uvm_page.c uvm_pager.c uvm_pager.h
> 
> Log Message:
> Reallocate emergency pager va when ncolors is increased. (modication of
> patch from mrg).

This panics LOCKDEBUG kernels as the call to uvm_pager_realloc_emerg()
in function uvm_page_recolor(), file uvm_page.c:1048 with spin
lock uvm_fpageqlock held leads to:

Mutex error: lockdebug_barrier: spin lock held
db{0}> bt
mutex_enter() at netbsd:mutex_enter+0x4a3
uvm_km_check_empty() at netbsd:uvm_km_check_empty+0x73
uvm_map() at netbsd:uvm_map+0x1a2
uvm_km_alloc() at netbsd:uvm_km_alloc+0xe4
uvm_pager_realloc_emerg() at netbsd:uvm_pager_realloc_emerg+0x5b
uvm_page_recolor() at netbsd:uvm_page_recolor+0x35b
cpu_attach() at netbsd:cpu_attach+0x333

--
Juergen Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig 
(Germany)