Re: 2.4.0-test10-pre3:Oops in mm/filemap.c:filemap_write_pa

[Linus Torvalds]

On Mon, 23 Oct 2000, Petr Vandrovec wrote:
> 
> Yes. With sleep(60) no oops occur (it takes ~45 secs to exit child). 
> This signals to me: should not vmtruncate_list acquire mm->mmap_sem, 
> if it modifies page tables?

No. 

It should get the page_table lock, but that is sufficient for anybody who
_clears_ page tables (and is pretty much the same case as paging something
out of somebody elses page tables).

>                I cannot find anything what prevents doing 
> vmtruncate in one task and filemap_sync in another - neither
> page_table_lock spinlock, nor mmap_sem semaphore...

filemap_sync() does hold the page table lock. 

(Which is certainly not to say that it's necessarily bug-free, but I don't
see any obvious problems off-hand).

                Linus

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