ptrace on linux 2.6.12 causes oops

[aris at conectiva.com.br]

> when i try to run strace or gdbserver on a program, the following comes:
> 
> NIP [c000543c] __flush_dcache_icache_phys+0x38/0x54
> LR [c000b060] flush_dcache_icache_page+0x20/0x30
> Call trace:
> [c000b154] update_mmu_cache+0x7c/0xa4
> [c005ae98] do_wp_page+0x460/0x5ec
> [c005c8a0] handle_mm_fault+0x7cc/0x91c
> [c005ccec] get_user_pages+0x2fc/0x65c
> [c0027104] access_process_vm+0x9c/0x1d4
> [c00076e0] sys_ptrace+0x240/0x4a4
> [c0002bd0] ret_from_syscall+0x0/0x44
> mm/memory.c:2054: spin_lock(kernel/fork.c:c0ea1618) already locked by 
> mm/memory.c/1306
please try to reproduce with 2.6.13-rc2. seems much like the problem Marcelo
fixed recently (dcbst misbehaviour with unpopulated TLB entries)

-- 
Aristeu