Messages in this thread |  | | Date | Mon, 23 Oct 2000 14:32:25 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: 2.4.0-test10-pre3:Oops in mm/filemap.c:filemap_write_pa |
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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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