On Fri, 30 May 2014 02:51:08 -0400 Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> wrote:
> From: Tony Luck <tony.luck@xxxxxxxxx>
>
> When a thread in a multi-threaded application hits a machine
> check because of an uncorrectable error in memory - we want to
> send the SIGBUS with si.si_code = BUS_MCEERR_AR to that thread.
> Currently we fail to do that if the active thread is not the
> primary thread in the process. collect_procs() just finds primary
> threads and this test:
> if ((flags & MF_ACTION_REQUIRED) && t == current) {
> will see that the thread we found isn't the current thread
> and so send a si.si_code = BUS_MCEERR_AO to the primary
> (and nothing to the active thread at this time).
>
> We can fix this by checking whether "current" shares the same
> mm with the process that collect_procs() said owned the page.
> If so, we send the SIGBUS to current (with code BUS_MCEERR_AR).
>
> Reported-by: Otto Bruggeman <otto.g.bruggeman@xxxxxxxxx>
> Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
> Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxx>
> Cc: Chen Gong <gong.chen@xxxxxxxxxxxxxxxxxx>
> Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
You were on the patch delivery path, so it should have included your
signed-off-by. Documentation/SubmittingPatches section 12 has the
details.
I have made that change to my copies of patches 1 and 2.
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