Re: __purge_vmap_area_lazy crash with CONFIG_PREEMPT_RCU=y

[Avi Kivity <avi@redhat.com>]

Marcelo Tosatti wrote:
> On Tue, Dec 30, 2008 at 02:53:36PM +1100, Nick Piggin wrote:
>   
>>>  RSP <ffff88011f4c7be8>
>>> ---[ end trace 31811279a2e983e8 ]---
>>> note: qemu-system-x86[4440] exited with preempt_count 2
>>>
>>>
>>> (gdb) l *(__purge_vmap_area_lazy + 0x12c)
>>> 0xffffffff80289ca2 is in __purge_vmap_area_lazy (mm/vmalloc.c:516).
>>> 511     if (nr || force_flush)
>>> 512         flush_tlb_kernel_range(*start, *end);
>>> 513
>>> 514     if (nr) {
>>> 515         spin_lock(&vmap_area_lock);
>>> 516         list_for_each_entry(va, &valist, purge_list)
>>> 517             __free_vmap_area(va);
>>> 518         spin_unlock(&vmap_area_lock);
>>> 519     }
>>> 520     spin_unlock(&purge_lock);
>>>
>>> 0xffffffff80289c9a <__purge_vmap_area_lazy+292>:    mov 0x40(%rbx),%rax
>>> 0xffffffff80289c9e <__purge_vmap_area_lazy+296>:    lea -0x40(%rax),%rbx
>>> 0xffffffff80289ca2 <__purge_vmap_area_lazy+300>:    mov 0x40(%rbx),%rax
>>>                                                     ^^^^^^^^^^^^^^^^^^^
>>>       
>
> Note:
>
> RAX: 6b6b6b6b6b6b6b6b RBX: 6b6b6b6b6b6b6b2b
>
>   

Good old POISON_FREE.


-- 
error compiling committee.c: too many arguments to function