On Thu, Sep 17, 2015 at 11:17 AM, Dmitry Vyukov <[email protected]> wrote: > flush_to_ldisc reads port->itty and checks that it is not NULL, > concurrently release_tty sets port->itty to NULL. It is possible > that flush_to_ldisc loads port->itty once, ensures that it is > not NULL, but then reloads it again and uses. The second load > can already return NULL, which will cause a crash. > > Use READ_ONCE to read port->itty. > > The data race was found with KernelThreadSanitizer (KTSAN).
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