On Fri, Jun 05, 2020 at 10:37:19AM +0900, Naoya Horiguchi wrote:
> Action Required memory error should happen only when a processor is
> about to access to a corrupted memory, so it's synchronous and only
> affects current process/thread. Recently commit 872e9a205c84 ("mm,
> memory_failure: don't send BUS_MCEERR_AO for action required error")
> fixed the issue that Action Required memory could unnecessarily send
> SIGBUS to the processes which share the error memory. But we still have
> another issue that we could send SIGBUS to a wrong thread.
>
> This is because collect_procs() and task_early_kill() fails to add the
> current process to "to-kill" list. So this patch is suggesting to fix
> it. With this fix, SIGBUS(BUS_MCEERR_AR) is never sent to non-current
> process/thread.
Does the new code now send SIGBUS(BUS_MCEERR_AO) to all the other threads
of a multi-threaded process?
It looks like it might (and I don't have some handy multi-threaded test
case to try it out).
If it does, is that what we want?
-Tony
