Messages in this thread |  | | Date | Thu, 20 Sep 2001 20:24:36 +0200 | From | Andrea Arcangeli <> | Subject | Re: Deadlock on the mm->mmap_sem |
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On Thu, Sep 20, 2001 at 10:57:08AM +0000, Studierende der Universitaet des Saarlandes wrote: > * A fair, recursive mmap_sem (a task that already owns the mmap_sem can > acquire it again without deadlocking, all other cases are fair). That's > what Andrea proposes. (Andrea, is that correct?)
Exactly.
> elf_core_dump should call down_write to prevent concurrent expand_stack
expand_stack doesn't need the write sem, see the locking comments in the 00_silent-stack-overflow patch in -aa.
> calls, and acquire the pagetable_lock around some lines (right now it > walks the page tables without locking). I'll check the other coredump
Also expand_stack needs the page_table_lock, that's ok.
> I'll write a patch that moves the locking into the coredump handlers, > then we can compare that with Andrea's proposal.
Ok.
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