On Fri 11-03-16 12:54:17, Vlastimil Babka wrote: > On 03/11/2016 12:32 PM, Vlastimil Babka wrote: > >On 02/29/2016 02:26 PM, Michal Hocko wrote: > >>From: Michal Hocko <mhocko@xxxxxxxx> > >> > >>coredump_wait waits for mmap_sem for write currently which can > >>prevent oom_reaper to reclaim the oom victims address space > >>asynchronously because that requires mmap_sem for read. This might > >>happen if the oom victim is multi threaded and some thread(s) is > >>holding mmap_sem for read (e.g. page fault) and it is stuck in > >>the page allocator while other thread(s) reached coredump_wait > >>already. > >> > >>This patch simply uses down_write_killable and bails out with EINTR > >>if the lock got interrupted by the fatal signal. do_coredump will > >>return right away and do_group_exit will take care to zap the whole > >>thread group. > >> > >>Cc: Oleg Nesterov <oleg@xxxxxxxxxx> > >>Signed-off-by: Michal Hocko <mhocko@xxxxxxxx> > > > >Acked-by: Vlastimil Babka <vbabka@xxxxxxx> > > Forgot to point out typo in Subject which makes it hard to grep for mmap_sem Fixed and thanks! -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
